tm. Dhasion of i VHi^.^ Secft'ona] Library JOHN BROOKS HENDERSON CONCHOLOGIA ICONIC A: ILLUSTRATIONS SHELLS OF MOLLUSCOUS ANIMALS VOL. XVI. CONTAINS iG MONOGEAPHS OF THE GENERA UNIO. IRIDINA. GALATEA. PLEIODON. HAMINEA. AKEKA. BULLA. HYDATINA. DOLABELLA. MYCETOPUS. Al'LUSTrxUJL DOLABWFERA. LOVELL AUGUSTUS REEVE, F.L.S., F.G.S., COKRESl'ONDING MKMBEK OF TllK NATURAL HISTOKY SOCIETY OF WURTEMBE NKW YORK, OF THE ACADEMY OF NATURAL SCIENCES OF ZOOLOr.lCO-HOTANICAL SOCIETY OF V LYCEUM OP NATJRA lA, AND OF HIE " Thyself how woudi'ous then, Unsijeakable I who sitt'st above these heavens To us invisible, or dimly seen In these Ihy lowest works." LONDON: L. REEVE & CO., 5, HENRIETTA STKEET, CO VENT GARDEN. 1868. MONOGRAPH OF THE GENUS ' U N I 0. " Tliy food shall be Tlie fivsh l)i-ook mussels." Shakespeai Unw R.I Sowerby.Jd et liih Vmcau Brooks IrnjT U N I . Genus UN lO. Ret:. ■J>sta Iii/ms marf/ari/ncca, (pqiiii-alrh, sapis-viui' ni,r-qi(ilnte- rnlU, pphkrmhh- cvii-yjirna.iemper indnta ; U.jammitam exteniinii ,• cnrilo variabilh, deidi/jiis antkii vd ceil- iralihits ii< vtrdqne vahuln 1-3 instrudus, srrpnis etiam lamellis lateralibus vi-l jmiicis pmterea mimiliis; im- pressiones muscnlares d/KP, poxtica composita. iSlR-11 pearly within, equivdve, almost always inccimlateral, constantly clotlied with a conspicuous ciuderuiis ; liirament. external ; hinge variable, furnished with one or f.vo central or anterior teeth in each valve, and strengthened besides, for the most part, by lateral or posterior lamellae; muscular sears two. the hinder one composite. Somewhat more than a hundred years have elapsed since LinuEnus first arranged shells in an artificial, yet simple, methodical, and easily comprehensible manner. mcrly disgraced the Proceedings of the Zoological Society, and still appear in those of the Academy of Natural j Sciences of I'liiladelphia, the few characters there specified i would equally apply to a score of other shells. An ordi- 1 nary Uiiio, devoid of any striking peculiarity of sculpture j or of contour, cannot possibly be determined without the I aid of a really good figure, or of a description so long and ' careful that few modern naturalists have the ])atience to elaborate it. Say's earlier species (those in the American edition of Nicholson's Cyclopedia) are so ill defined that even his own countrymen difler as to what shells he wished 1 to indicate. I It is, perhaps, to be regretted tiiat so extensive a genus ' as Unio was not subdivided in the present work, and the ! name restricted to such species only as are provided witii lateral laraellse, but the broad Lamarckian divisions, 1 adopted in the earlier volumes of the ' Iconica,' compelled I tlie author, despite of his gradually changed views of Since that period,' certain early-appreciated and natural ! natural groups, to preserve the outlines, at least, of his oenen («nch as typical Mya) have not even tripled in the j original design. Almmodonta, with its two prunary and number of known species, whdst the Uuiom-s, of which „o lateral i,,i\., Monocondyl^a, with merely one primary two or three only were distinguished by the (^,reat Sys- | tooth and no lamelte, are easUy distinguishable from the tematist are now known to us by hundreds. Indeed, ' typical U.mm. As io P.eudodcn, with its single rud.- methin- like a thousand so-called species have already mentary compressed tubercle in each valve, it had, perhaps, better have been wholly relegated to Anodon. Ingunoiloi, and Phgioduu, each based upon one shell only, are of less present importance. been described, and every year that indefatigable veteran, Isaac Lea (the loving patron of the Naiades), adds bewd- dering varieties, forms, or species (it is doubted which) to the conglomerated aggregate. It is more than probable that not one-half of the presumed species of ovir North American cousins will stand the crucial test of eritieism ; yet many of their really distinct forms have been here unavoidably omitted, from want of specimens for delinea- tion. Scarcely any of the shell-collectors of England care for such sombre-hued objects ; hence the omnivorous cabinets of Taylor, Hanley, and the British Museum, are almost our sole sources of study. Independently of the remarkable diversity of outline the male and female of each species (ditt'erences far as we know, are comparatively imperceptibh other genera), priority of nomenclature involves a never- ending investigation ; for Conrad and Lea (both natu- ralists of eminent ability) for the most part claim prece- dence of eacli other on no common ground for arl)itration : the former more usually from prior publication in |)rint tlie latter from prior readings at some scientific meeting As to sucli brii I' and utterly iiuidequalr diagnoses as for October, ISOS The United States of North Am great bulk of the recorded species ca now furnish the South Auieriea, if ever investigated with equal energy, will probably yield us as many distinctive forms. Asia (China has, perliaps, to be excepted) seems comparatively poor, since British j India, although its conehologieal fauna has been fairly ■ worke'd out by such enthusiastic naturalists as Theobald, Benson, and the Blandfords, scarcely adds more than a i score to our list. Europe, Africa, and Australasia (the ' two latter, possibly, from want of exploration) are alike h, so 1 sparingly provided with Naiades. most Species 1. (Mus. Cuming.) o BOYKINIANUS. Un. tentd mafjis iiiiviisn' rrassu, 1,1 medio veiilricosa, valde uMijiiituUrali, uhuialo-sub-^ tri,iond,antici perbrevi angustatd el rolundald, poslice lata depressd et alatd, olivaceo-nigresci plicis vudtis obliquis saljamwtis aut Jl,. oneolore, (d srrjie UNIO.— Plate fiircalis) uiii/ii/iie uniald ; margarila albklo-candes- ceiUe ; denliljKs c. The hinder dorsal area is broadly concave, and the liinge-margin is only broad where it serves as a base for the primary teeth. In the closely allied lieroi the folds near the ligament are small, narrow, and numerous. Species 2. (Mus. Cumin- ) .\s the shell represented proves to be a dwarf form of Unio fragosus, of which a fine and characteristic example has been delineated in Plate VII. (Fig. 27), the reader is referred to the description there appended. Species 3. (Mus. Cuming.) Unio Schoolcraftensis. Uh. tedd cra.mn.icuM, s/ib- ventrkosn, subquadrato-rotundd, vi.t inceqiitlateraU, ntitici late rotundatd, posiice sMiangulald, n'ltida, Jlavd, radio perviridi lata et brevi in medio sujieriii pictS, iuberculia planulnlis salisque magnis in medio infenie, alikqiie miuoribiis in et supra eostam nmbo- nalern suhangulatani (in e.mnjilis odnllix) sparsim ornatd ; umtjonibm enuneiililin\ . nuinjarild albido- cterulea , nine cardiiioli di-nlilii. nyoiii: rlica- libus, lamelliiiqiie lateraHbus i:u/idi.s et ri..r elungatis mnuito. Schoolcraft's Unio. Shell tiiickish, subventrico.se, squarish-orbicular, broadly rounded in front, subbiau- gular behind, of a shining bright yellow, painted above with a short broad central green ray, here and there adorned below (in full-grown specimens) with central tubercles which are flattened and rather large, and on or beyond the siibangular umbonal ridge with other smaller ones; umboes projecting; nacre bluish- white ; hinge-margin broad, strengthened with ver- tical triangular teeth, and strong, scarcely elongated, lateral lamellre. Lea, Trans. Amer. Phil. Soc. scr. 2. vol. v. p, 87 (Obs. on Unio, vol. i.), pi. 3. f. 9. Ilab. Fox River, Green Bav, N. America. Species 4. (Mus. Cuming.) Unio verrucosus. Un. tedd crassd, depressi/isni/ii, ui medio return, oblongo-subqiiadratd, valde inrrqnihiti-- rali, postice subbiangulatd, olivaced concolon-, a,ilr eostam umbonalem elevatnm rerriicis coiifertissimix uiidigue sculptd, et ultra earn plicis divergeiitib/is sub- arcuatis oblique ornatd; margine venlrali antic'!- acclivi, postice retuso ; natibus parris, o/jliquis, rixque promiiiidis ; margariid albo-nrgented ; margine cnr- dinali Into ; dentibus curdinalibus erectis, subtrigvnis, laciuiatis ; Inmellis la/i-rulibiis longis rei-tis, der/i- vibiis. TuE WARTY Unio. Shell thick, rather depressed, in- dented in the middle, squarish-oblong, very inequi- lateral, subbiangular behind, of a uniform olive- green, before the raised umboual ridge everywhere embossed with most crowded warts, and beyond it slantingly adorned with somewhat curved divergent folds ; ventral edge rising in front, indented behind ; beaks small, slanting, scarcely projecting; nacre silvery white; hinge-margin broad; primary teetii erect, subtriangular, jagged ; lateral lamelhv long, straight, oblique. Rafinesque, Mon. Coq. de la Riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1820, vol. v. pi. SI. f. l(i-12. U/iio tuberculatits, Barnes. Theliderma pwstulata, Swainson. Hab. River Ohio, N. America. The coloured epidermis is so thin that the crowded tubercles (which are elongated and almost perpendicular near the ridge) often become whitish from abrasion. There are two sets of folds ; those upon the narrow con- cave space adjacent to the ligament are much the smaller. UmcMJl. Vincent Brooks.lmp UN 10 Species 5. (Miis. Cuming.) Unio PLiCATUS. Un. tedii subquadrato-ovatii, postice coMjire«sii et decUvi-truncatd, umhomhus-prominentibiis, amjj/is, tumidis, oblique perainpUter pUcatis, pUcis si- Huosis, prope ad marginem vmtralem ohliqui desceii- dentibus ; epidermide fidvo-yiiyrd. The plaited Ukio. Sliell somewhat squarely orate, posteriorly compressed, and slopingly truncated, um- boes prominent, large, swollen, obliquely very largely plaited, plaits sinuous, descending obliquely nearly to the ventral margin ; epidermis fulvous-black. Say, Amer. Conch, pi. 1. f. 8. Unio Peruviana, Lamarck. Unio rariplicata, Lamarck. Unio Bomhei/ana, Valenciennes. Hab. North America. Cliaracterized by the swollen proniinence of the uraboes, and iMldness uf the oblique sinuous plaits. Species 6. (ilus. Cuming.) Ukio Kleinianus. Un. teddobtusi; trigond, conipressius- cidd, postice declivi-truncatd, nndique nitide divarica- liin liralo-plicatu, plicis parvis, nuinerosis, inteniitiis concentrice tenninidcatis et siriatis ; epidi-rmide fidoo- olivaced. Klein's Unio. Shell obtusely triangular, rather com- pressed, posteriorly slopingly truncated, neatly diva- ricately ridge-plaited throughout, plaits small, nu- merous, interstices concentrically finely grooved and striated ; epidermis fulvous-olive. Lea, Trans. Amer. Phil. Soc. Second Series, vol. 10. pi. 17. f. 18; Obs. vol. 5. p. 21. Hab. Suwanee River, Florida, North America. When Mr. Lea, in 1852, described this pretty species, he remarked that the beaks of the only two specimens then known to him were much eroded, and that he should suppose " that, in perfect or young specimens the folds would extend to the apex, and present a fine appearance." Mr. Cuming's specimen, here figured, has much of the character Mr. Lea anticipated. Species 7. (Mus. Cuming.) Uxio c.elatus. Un. ((fstd lati sccurifornii, comipresm, medio concavo-contradd, l/vvigaid, versus margines posticum et ventralem radiatim verrucoso-rugatd ; epi- dermide nigricante-viridi, Inteo linctd el variegald. The carved Unio. Shell broadly wedge-shaped, com- pressed, concavcly contracted in the middle, smooth, radiately wart-wrinkled towards the posterior and ventral margins ; epidermis dark green, stained ami variegated with yellow. CoNKAD, Frcshw. Shells, p. 29. f. 3, -1. Hab. North America. A prettily-coloured wedge-shaped shell, compressly contracted in the middle, smooth throughout, except at the posterior and ventral margins, where sculpture is de- veloped in strong wart-wrinkles. Species 8. (Mus. Cuming.) Unio ueros. Un. testa subquadrato-ovatd, postice late expansd, snbflabelliformi, circa nmbones crispato-verru- cosd, deinde oblique perampliter pUcatu, plicis siuuosis, superioribns minoribns, versus marginem dorsalem ra- diantibus ; epidermide fusco-nigrd. The hero Unio. Shell somewhat squarely ovate, pos- teriorly broadly expanded, rather fan-shaped, crisply verrucose around the uraboes, then obliquely very largely plaited, plaits sinuous, upper smaller, radia- ting towards the dorsal margin ; epidermis fuscous- bla'ck. Say, ' Disseminator,' Lea, Syuops. p. 20. Unio mnltiplical/is, Lea. Hab. North America. ]\Ir. Lea claims the adoption of his name of U. midti- pticatus for this species on the grounds that Mr. Say, after having described it in the ' Disseminator ' with the name of U. lieros, abandoned the species in his ' American Con- chology ' as being a variety of U. undulatus. If Mr. Lea considered Mr. Say's original view to be the right one, he should have reinstated the original name. AuL'ust, 18C4. UmcPlM Sawerby.del etlith VmcentBroote.Imp U N I 0. Species 9. (Fig. 9, and 12, Mus. Cuming.) Unio tubeuculatus. Uii. testa orbicidari, compressiiis- cidd, posiice Jlexitoso-lrwncatd, medio et latere postico de umbonibus ad margines rude irregulariter verru- cosis ; epidermide fuho-oUvaced. The tubekcled Unio. Shell orbicular, rather com- pressed, posteriorly flexuously truncated, middle and posterior side irregularly rudely warted from the umlioes to the margins; epidermis fulvous-olive. llAFiNEsauE, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1820, vol. 5. p. 287. Unio verrticusus, Barnes. Unio titiercidosus, Valenciennes. Hnb. North America. The wart tubercles in this species are peculiarly rudely developed, and the compressed flexuous truncation of the posterior side of the shell is also a specific character. Species 10. (Mus. Cuming.) Unio turgidus. U/i. testa siibqiiadrato-roi/indald, pos- tici-flexuosd, decUvi-truiicatd, medio subcontractd, medio et circa nmbones concentrice Hoduso-luberculutd ; epi- dermide nigricante-oUvacen. The swollen Unio. Shell somewhat squarely rotun- date, posteriorly tlexuous, and slopingly truncated, ratlicr contracted in the middle, concentrically no- dosely tnbercled in the middle and around the um- boes ; epidermis blackish-olive. Lea, Trans. Amer. Phil. Soc. 1834, vol. (>. pi. .5. f. 11. Obs. vol. 2. p. 11. Uiiio Mortoni, Conrad. Hah. New Orleans, North America. Rather flexuously contracted on the posterior side, the sculpture beitig in the form of concentrically inclined no- Species 11. (Mus. Cuming.) Unio apiculatus. Uh. testa subquadrul.o-ocatd, pMi id Jtexuoso-aiigulatd, deinde declivi-truncatd, medio con- cavo-coiitractd, undigue nitide rugoso-nodulatd ,■ cpi- derw ide fidvo-olivaced. Thk bee-covered Unio. Shell somewhat squarely ovate, posteriorly flexuously angled, then slopingly truncated, concavely contracted in the middle, neatly rugosely noduied throughout; epidermis fulvous- olive. Say, Amer. Couch, pi. 52. llab. North America. ricsembling the preceding species in form, but uiore ([uadrately flexuous, and beautifully sculptured tliroughout. UnivRIV Sovrerty.adeLlitK Vincent Brooksjmp U NIO Vla Species 13. (.AIus. Cuming.) Unio ATR0C0ST.4.TUS. Un. tes(d ovatd, oblique subjlahelli- fond, circa umbones irregulariter crispaio-nigatu, de- inde oblique ampUter plicato-costatd ; epidermide nigra. The black-ribbed Unio. -Shell ovate, obliquely some- j what fan-shaped, irregularly crispately wrinkled 1 around the umboes, then obliquely largely plicately ribbed ; epidermis black. IjEA, Trans. Amcr. Phil. See. Second Series, vol. 10. pi. j 2. f. 5 ; Obs. vol. 4.. p. -l-i. Hab. Alabama, North America. There is very little in this species, beyond the fact of I its being of a less oblong-square form, to distinguish it Species 14. (Mus. Cuming.) Unio sparsus. Un. testa suborbiculari-ovaid, depressd, postice obtime angulaid et Jiexiioso-conipresm, laviiis- culd, obsolete sparsim verrucosa, poslici subverrucosd ; epidermide ftdvo-oUvaced. The sprinkled Unio. Shell somewhat orbicularly ovate, depressed, posteriorly obtusely -angled, and ttexuously compressed, rather smooth, obsoletely sparingly wartetl, posteriorly rathei- warted ; epider- mis fulvous-olive. Lea, Trans. Amcr. Phil. Soc. Second Series, vol. 8. pi. 25. f. 58 ; Obs. vol. 3. p. 82. Hab. East Tennessee, North America. Very similar in form to IT. tubercuhifus, and not unlike the young of that species. luch Species 15. (ilus. Cuming.) Unio Phillipsii. Un. testa ohhmyo-quadratd, medio subcontractd, postice peranipliler expnusd, biangulatd, ad angulos et versus marginem promiscue lumido- tuberculatd ; epidermide virescenle, olivaceo radialim fasciatd et lineatd. Phillips' Unio. Shell oblong-square, rather contracted in the middle, posteriorly very largely expanded, two-angled, promiscuously tumidly tubercled at the angles and towards the margin ; epidenuis greenish, radiately banded and lineatcd with olive. Conkad, Monog. p. 9. pi. 5. f. 1. Hub. North America. Characterized by an unusual expansion of the posterior side, which is bi-angled, and rudely tumidly tubercled on the angles. Species 16. (Mus. Cuming.) Unio costatl's. Un. testa oblotigo-ovatd, postice subquad- rato-productd, medio oblique sinuose plicato-costatd, cos/is versus marginem poslicum corrugaio-radiantibus; epidermide fulvo-olivaced. The ribbed Unio. Shell oblong-ovate, posteriorly ra- ther squarely produced, obliquely sinuously plicately ribbed in the middle, ribs corrugately radiating to- wards the posterior margin ; epidermis fulvous-olive. Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1830, vol. 5. p. 28 7. Uuio undulatus, Barnes. North America. IM This species appears to differ from its congeners in not being crispately warted about the umboes. UniiFlV Sovferby.deletlith Vmrent Brooksimp ^ \ UNI 0. Species 17. (Mus. Cuming-.) Uxio TUAPEZOIDES. Lhu teslil ohlongo-trape:oided, 2)0B- tice conspicue (umido-anr/iilalct, deiitde declivi-tnm- cald, wnbonibus compressis, circa nmbones siibobsolete crhpalo-verrucosd, peroMique breviter pUcato-costatd ; epidermlde nigra. Thk tkafezoid Unio. Sliell oblong-trapozoid, poste- riorly conspicuously tumidly angled, then slopingly truncated, umboes compressed, around the umboes rather obsoletely crispately warted, very obliquely shortly plicately ribbed; epidermis black. Lea, Trans. Amer. Phil. Soc. vol. iv. pi. 3 ; Obs. vol. i. p. 79. Unio iiderruptns, Say. Hab. Lake St. Joseph, Louisiana, North America. Of a particularly characteristic trapezoid fonn, but par- taking, nevertheless, of the sculpture of Z7. heros and its congeners. Species 18. (Mus. Cuming.) Unio aspek. Un. testa suI)quadrato-globosd, medio con- cavo-coiitractd, postice obtuse aiigidaldet declivi-trun- catd, biradiatini nodoso-tubercidatd, prope marginem, posticum radiaiim rtigatd ; epidermide fidvo-olivaced. The rough Unio. Shell somewhat squarely globose, concavely contracted in the middle, posteriorly ob- tusely angled and slopingly truncated, biradiately nodosely tubercled, radiately wrinkled near the pos- terior margin ; epidermis fulvous-olive. Lea, Trans. Amer. Phil. Soc. vol. iv. pi. 9. f. 13 ; Obs. vol. i. p. 95. Hnb. Alabama, North America. Besides the two conspicuous rays of tubercles noted in the foregoing description, there are indications of pus- tules which in some specimens may probably be more de- Spoeies 19. (Mus. Cuming.) Unio caPEU.^TUS. Un. testa oblongo-seciiriformi, antice brevissimd, postice compresse prodnctd, concentrice ir- regnlririter caperutd, medio olisolel'e radiaiim iioda- latd fnho-oticaced, intense viridi ; radiatiin undidato- lineatd. WRINKLED Unio. Shell ovately-oblong wedge- shaped, anteriorly very short, posteriorly compressly produced, concentrically irregularly wrinkled, obso- letely radiately noduled in the miildle, fulvous-olive, radiately undulately lineated with dark- green. , Trans. Amer. Phil. Soc. Second Series, vol. .-c. pi. 5. f. 14; Obs. vol. iv. p. 49. Hub. Tennessee, North America. Extremely iiRnpiilateral, the shell being as short on the anterior side as in Bonax. Tin Le.^ Species 20. (INIus. Cuming.) Unio Elliottii. Un. testa suborbiculari, postice sublate expansu, oldique perampliler costald, postice radiatim costatd, umbonibus paroiuscidis ; epidermide nigra. Elliott's Unio. Shell nearly orbicular, posteriorly ra- tiier broadly expanded, obliquely very largely ribbed, posteriorly radiately ribbed, umboes rather small; epidermis black. Lea, Pro. Acad. Nat. Sci. Philadelphia, IS.V.. p. 20;^; .(ourn. Second Series, vol. iv. pi. 7 ; Obs. vol. vi. p. 54. Hub. Othcalooga Creek, Gordon County, Georgia. North America. A fine, bold spe dar in form, thou rior side. L'S of the r. heros 1 rather broadly t\\ August, 1S64. UnUH. 17. m'lw Vincent- BToo\s.lnip, UN 10. Plate VI. Species 21. (Mus. Cuming.) Unio Foesheyi. Un. testa mibquadmto-orliadari, pos- tice subobscnre liangidatd, deinde conipresse jiroditdd, iindiqiie copiose nodoso-tuberculatd ; fidvo-ollvaceCi. Fokshey's Unio. Shell somewhat squarely orbicu- lar, posteriorly rather obscurely two-angled, then compressly produced, copiously nodosely tubcrckJ throughout ; fulvous-olive. Le.\, Journ. Acad. Nat. Sci. Philad. Second Series, vol. iv. pi. 60. f. 182 ; Obs. vol. viii. p. 39. Hob. Texas and Alabama, North America. An extremely pretty species, doubly angled and flexu- ously compressed on the posterior surface, and studded throughout with neat, nodose tubercles. Species 22. (Mus. Cuming.) Unio FLEXUOSUs. Un. testa ovatd vd quadrato-ovatd, Iceviuscidd, medio et postice late rude cosiatd, costis ad extremitates iuterdum prodiwtis et lobatis ; fuho-oU- vaced vel brumied, virldi interdum rudiatim liueatd. The flexuous Unio. Shell ovate or squarely-ovate, rather smooth, broadly rudely ribbed in the middle and posteriorly, ribs sometimes lobed at the extre- mities, sometimes produced aud lobed ; fulvous-olive or brown, sometimes radiately liueated with green. Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1820, vol. v. p. 287. Unio foliatits, Hildreth. Hab. North America. The more flexuous form of tliis species is the curious lobed variety of which we give a representation at Plate XIII. Fig. 53. According to recent observations it is said to be the male of the species, the form here figured beins; the female. Species 23. (Mus. Cuming.) Unio REFLEXUS. Un. testa subtriyono-ovatd, postice ob- scure flexiioso-aiigidatd, taviusculd, medio radiatim tu- berciiliilii, Inherciilis distantibus, compressis, quasi cor- nulix, (iri'ii liijinui'iiH rufjaid ; fulvo-oUvaced. The EEi'Li.rcED I'mo. Shell somewhat triangularly ovate, posteriorly obscurely flexuously angled, rather smooth, radiately tubercled in the middle, tubercles distant, compressed, as if horned, ligamentary area wrinkled ; fulvous-olive. Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1830, vol. v. p. 287. Unio cornutus, Barnes. Hub. North America. The tubercles have a peculiar pinched growth, the inter- stices between them being hollowed. Species 2-t. (Mus. Cuming.) Unio quadratus. Un. testa suborbiculari-ovatd, }iostice obscure biangulatd et compresse Jlexuosd, radiatim ver- rucoso-tuberculatd, (ubercidis promiscui.s, hie illic dis- tantibns ; riri'sn'iilt'-iiHrnccd. The saUARE Imo. Shrll somewhat orbicularly ovate, posteriorly ob>cunl\ biaiigled and compressly Hexu ous, radiately verrueosely tubercled, tubercles promis- cuous, here and there distant ; greenish-olive. Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc Phys. Brux. 1820, vol. v. p. 287. Unio quadrulus, Say. Unio asperrimus, Lea. Rab. Ohio river. North America. A tine, posteriorly flexuous species, in which the radia- ting warts are curiously promiscuous in their development August, ISG-t. UmcFL VII. Sowerbydelet hth "^^Ticent Brooka Imp U N I 0. Species 25. (Mus. Cuming) Unio metanevek. I'll, testa subquadrato-orblculari, gibbosiuscula, postice Jlexuoso-angulatd, delude com- presse truncatd, undique irregulariter nodoso-tubercu- latd et verrucosa ; fulvo-otivaced, viridi variegata. The settler Unio. Shell somewhat squarely-orbi- cular, rather gibbous, posteriorly flesuously augled, then compressly truncated, irregularly nodosely tu- bercled and warted throughout ; fulvous-olive, varie- gated with green. Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. IS-'O, vol. v. p. 287. Unio nodosHs, Barnes. Unio rugosHS, Barnes. Telederma metanevra, Swain son. Hab. North America. There is a characteristic irregularity about the sculpture of this species. Species 26. (Fig. a, b, Mus. Cuming.) Unio prasinus. Un. testa ovatd, regidariter convexd, postice. obtuse aiigidari, delude cornpresse truncatd, lavigatd, in medio et versus angulum obtuse verrucosa, postice radlaflm rugatd ; fidvo-ollvaced, ad iimbones viridi radintd. The leek-green Unio. Shell ovate, regularly convex, posteriorly obtusely angular, then compressly trun- cated, smooth, obtusely warted in tlie middle and towards the angle, posteriorly radiately wrinkled ; fulvous-olive, rayed with green at the und)oes. Conrad. Ilab. North America. Mr. Lea quotes this species as being a variety of Z7. Schoolcrnfttnsis. The two specimens here figured, received by Mr. Cuming from a very good authority on the sub- ject, Mr. Anthony, lead me to think that it must be dis- tinct. There is a resemblance in colour and radiation, but an important difference ill form, and in the character of the sculijture. Species 27. (Mus. Cuming.) Unio fragosus. Un. testa suborbiculari, gibbosiuscutd, postice obtuse angulatd, delude cornpresse expansd, um- iioulbus .lubprominulis, undique promlscue tuberculato- verrucosn, postice radiatd; fulvo-olivaced, viridi tinetd. TuE ROUGH Unio. Shell somewhat orbicular, rather gibbous, posteriorly obtusely angled, then compressly expanded, umboes rather prominent, promiscuously tubercularly warted throughout, posteriorly rayed ; fulvous-olive, tinged with green. Conrad, ilonog. pi. 6. f. 3. I.lab. North America. Of an orbicularly expanded form, sculptured in a pe- culiarlv bold and lu'omiscuous manner. CJnwFiVm. (Iticent Brooks.Imp U N I . Plate VIII. Species 2S. (Miis. Cuming.) LImo cypHIUS. Un. testa ohliqui ovatd, aiitice hrevi, postice compressa, suLattmuald, concmtrice rude ni- fjatd, ill medio radialim ol/tuse luberculald, pallide fulco-olivaced. The taulted Unio. Shell obliquely-ovate, autei-iorly short, posteriorly compressed and somewhat altenu- ated, concentrically rudely wrinkled, in the middle radiately obtusely tuberoled ; pale fulvous-olive. K.\FiNES(jUE, Men. Coq. de la riv. Ohio, Ann. Geu. Sc. Phys. Brux. 1820, vol. v. p. 287. Uiiio JEsopus, Green. Hub. North America. An oblique, rudely-sculptured shell, generally of a pe- culiar pallid-olive colour. Species 29. (Mus. Cuming.) Unio brom.as. Un. testa oblique sultpi/rifundi, anlu-i brevissimd, postice curvald, concentrici niijuld, in me- dio radiatim obsolete nodulatd ; fulvo-olivaced, viridi radiatiiii variegatd. The duo.medaey Unio. Shell obliquely somewhat pear- shaped, anteriorly very short, posteriorly curved, con- ceutrically -wrinkled, in the middle radiately obso- letely noduled; fulvous-olive, radiately variegated with green. Lea, Trans. Amer. Phil. Soc. vol. v. pi. 10, f. 29 ; Obs. vol. 1. p. 182. Hub. Tennessee, North America. Of a characteristic obliquely-curved growth, the um- boes standing out like two humps. Species 30. (Mus. Cuming.) Unio striatiis. Uh. testa oblique suborbiciduri, postice rotundato-producld, concenlrice irregidanter nodoso- tuberculatd ; ulivaceo-bnii/ned. TuR STRIATED Unio. Shell obliqucly suborbicular, pos- teriorly rotuudately produced, concentrically irregu- larly nodosely tubercled ; olive-brown. R B \FINESQUE, M Phvs. Brux. Uiho Cooper 'ab. North Amei \\ Copiously marl ith irre-uiar pii itric stnaB of growth, and cles. Species 31. (Mus. Cuming.) Unio cicatricosus. Uti. testa elougato-eordatd, aiitice brevissimd, postice valde productd, cunceittrice ruijutd, medio spursini obtuse verrucosa ; fulvo-bruiuied. The cicatriced Unio. Shell elongately-cordate, ante- riorly very short, posteriorly very much produced, concentrically wrinkled, in the middle sparingly ob- tusely warted ; fulvous-brown. Say. Unio varicosus. Lea. Ilab. North America. The normal form of this species will be found at Phde XII L Fig. -tU. Its extremest variation of growth is re- presented in the characteristic specimen here figured, in which the umboes arc prominently terminal and beaked, and its posterior side very nuieh produced. August, 1SG4. /nwFL/I. Sower}iy,tcriorly compressly truncated, both siih- iopi,,ii-l\ minutely tnbercled ; yellowish, stained ami \:in. -^itt d with bluc-grecn. Lea, Trans. Amer. Phil. Soc. vol. iii. pi. G. f. 8 ; Obs. vol. i. p. 14. Ilah. North America. and very neatly dropping like t .culpt Species 34. (JIus. Cuming.) Unio GUANIFERCS. JJu. iesid subroliuidd. /mslich i.indav compresse Imncatd, medio el jju-t/ice /iibcrrii/iilo-jio- didusd, uodidis s/iarus ,• rnr.sir„/r-,jlifami, intii.-: ciipreo-piirjiuruscente. The grained Unio. Shell nearly round, posteriorly moderately compressly truncated, in the middle and on the posterior side, tubercularly nodnled, nodules scattered ; greeui^h-olivi-, inti rior CO), pel V-pnrple. Lea, Trans. Amer. i'liil. Soe. vol. 1. pi. UJ. t .•3, 4; Obs. pio- vol. ii. p. 69. pi. 19. f. (50. type Ilab. Ohio River, North America. The tubercular nodules of this sjiecies ai e peculiarly scattered, and always absent IVoi 1 the ante rior side uf the shell. Species 3."i. [M\\&. Cuiiiiiig.) Unio VERPLICATUS. Vh. ti-.da sidjlriynno-oratd, j/os/ici- expaiisd, superne subahila, uhliiine mile corrmjuto- plicatd, plicis ad htiis poxfirniii radiunlihus : iiitfiixe olivaceo-uiyrd. The mucu-plaITED Uxio. Shell somewh.-it triangnhu-ly ovate, posteriorly expanded, slightly winged at the upper part, oblicpiely rudely wrinkle-plaited, plaits on the posterior side radiating ; dark olive-black. Conrad, Anthony, MS. in Mus. CnmiLig. Ilab. North America. rap. ightiv There ap] rred, in this species an indication to become r UimB.^i. U N 10 Spec 36. (Mub. Cuming.) >. Uii. testa triyono-ovald, subtequl- Unio sesiigr\> lateralis concept rice rude plicatd, imdiquc dense verrii- mso-i/raiiald, grains ad latiis atiticum evaiiidis ; sor- ilnli' otieaced, intiis cupreo-pitrpured . TiiK n.iLF-Git.MNED Unio. Shell triangularly ovate, nearly equilateral, concentrically rudely plicated, closely wart-grained throughout, grains fading away on the anterior side ; dull olive, interior coppery- purple. Philippi, Mag. de Zool. 18-i3, p. US. Hab. Mexico. This, and the species given at Fig. 37 an a characteristic granulated type of the ge Mexico. 39, represent Lis peculiar to Species 37. (Mus. Cuming.) Unio pliciferus. Un. testa subelonyato-ovatd, veiitri- cosissiiiid, poslice decUvi-acitminatd, copiose verrucoso- yranatd, (/rams ad nream posticam in plicis radianti- hus ; olivaceo-nigrd, itUus cupreo-purpured. The plaited Unio. Shell somewhat elongately ovate, very ventricose, posteriorly slopingly acuminated, copiously wart-grained, grains on the posterior area in radiating folds; olive-black, interior coppery- purple. Tea, Trans. Anier. Pliil. See. 1S36; Obs. vol. ii. p. 61. pi. 17. f 53. Ilab. Jlexieo. Characterized by the same granular sculpture as the preceding species, the gnuns on the posterior area ran- ging in radiating folds ; the shell is of peculiarly ventricose growth. Species 3S. (Mus. Cuming.) Unio Dokfeiiillianus. I'n. testa subqundrnlo-rotHndiU gibbosd, postici fexiwso-angnlatd, tr/ii/catd, sjjaraim tiibercidatd, tii/je/ridis interdiiM vi.r ukIUs ; intense olivaced. DoRFEniLLE's Unio. Shell somcwhat squarely rouiuled, gibbous, posteriorly ilexuotisly angled, and truncated, sparingly tidjercled, sometimes scarcely any ; dark olive. Lea, Trans. x\mer. Phii. Soc. 1836 ; Obs. vol. ii. p. 73. pi. 17. f. 54. Ifab. Ohio River, North America. A moderately t\d)ercled shell, rudely flexuously trun- cated on the posterior side. Species 39. (Mus. Cuming.) Unio corium. Un. iestd subqitadraio-oblongd, depressias- culd, postice Jkviwse obtuse angulald, Iruncatd, con- centrice subrude plicatd, circa umbones dense verrucoso- granatd ; sordide olivaced, intus palUde rosaceo-pur- purascente. The shagreen Unio. Shell somewhat squarely oblong, rather depressed, posteriorly flexuously obtusely angled and truncated, concentrically rather rudely plicated, around the umboes closely wart-grained ; dull olive, interior pale rose-purple. Hab. Chiapa, Mexico. The form of this shell is too widely distinct from that which we have figured as Mr. Lea's U. pliciferus, to allow of it Ijcing regarded as the same species, but it is impos- sible to foresee whether they might not be connected by an extended series of specimens. August, 1864. L UTm>K..U II N I Spec-ies ii). Qhii. Ci.ini.iir.) Unio HIPPOP^US. Uh. ksld ublouyu-uvuld, ijibboniusCKld, iiiilice brevissimu, postici obtuse aiifjidatCi, ubnoleth riule pUcatd ; castaneo-brunned. The uokse-foot Unio. Shell oblong-ovate, rather gib- l>ui.is, anteriorly very short, posteriorly obtusely an- gled, obsoletely rudely plicated ; chestiiut-browu. Lea, Trans. Amer. Phil. Soc, Second Series, vol. x. pi. 1. f. 1; Obs. vol. iv. p. 41. Ilab. Lake Erie, North America. Of a peculiarly gibijose oblong-ovate lunu, largely ob- liquely plaited, but the plaits are almost obsolete. Species 41. (Fig. a, b, JIu?. Cuming.) Unio GIBBOSUS. Un. Usld nitbubloiiyo-urntu, jdiis lui/ius caiwiformi, aiiiice breviuimd, po-^/ic- (Irrliri-aciniti- imtd, vd comprfsse expansd, binidinliiit nidc Inbcrcn- lald ; oUcactu-Inkd, viridi niiidi limari-radlatd. The gibbous Unio. Shell somewhat oblong-ovate, more or less wedge-shaped, anteriorly very short, poste- riorly slopingly aeuuiiiialed, or conipressly expanded, biradiately rudely tubercled ; olive-yellow, neatly li- IUfinesuue, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1820, vol. v. p. 387. Ilab. North America. The two forms of this species here tigured show how materially the shell varies in its posterior growth. Species 42. (Mus. Cuming.) Unio perlensis. Un. testa suboblomjo-ovatd, crassd, ffibbosissimd, postici arciiato-truncald, oblique pernm- pliter plicatd, plicis versus iiiargiueM plus n/i/nis obso- letis ; intense oUvaceo-uigrd. The solid Unio. Shell somewhat oblong-ovate, thick, very gibbous, posteriorly arouately truncated, ob- licpiely very largely plicated, plaits more or less ob- .solete towards the margin ; dark olive-black. Conrad, Anthony, MS. in Mus. Cuming. Ihb. North America. Remarkable for its short, very gibbous jiruwth. August, 1864. UnuPlM. UN 10. Plate XII. Species 43. (Mus. Cuming.) Unio bullatus. Tin. testa subcordato-orbiculari, postice quadrato-truncatd, promiscue (iniildo-verrticosd, ver- rucis ad latus podkuvi plicato-radiantibus ; oUvaceo- The bubbled Unio. Shell somewhat cordately orbieu- lar, posteriorly squarely truncated, promiscuously tumidly warted, warts plicately radiating on the posterior side ; olive brown. Kafinesqde, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1820, vol. v. p. 287. Unio jmstulosiis. Lea. JIab. North America. A subrotund shell, rather prominent at the umboes, s(|uarely truncated on the posterior side. Species 44. (]\Ius. Cnuiing.) Unio irroeatus. Uti. testa subtrigouo-corduld, postice arciiato-declivi, concentrice varicoso-lii-atd, liris mo- dice nodulatis ; lutescente-olivaced, punctis viridibits copiosH radiald. 'I'he bedewed Unio. Shell somewhat triangularly cor- date posteriorly arcuately sloping, concentrically va- ricosely ridged, ridges moderately noduled ; yellow- ish-olive, copiously rayed with green dots. Lea, Trans. Amer. Phil. Soc. 1827 ; Obs. vol. i. p. 11. pi. 5. f. 5. llnb. North America. It appears to be a character in this species that the radiatmg bands of green are composed of numerous small dots. Species 45. (Mus. Cuming.) Unio stegarius. Uti. testa suborbicidari, depressiuscidd, medio modice concavo-jlexuosu, postice. snbtnoicatd, concentrice rnriroso-Hn/tii. prnfini^ irretpitariter ver- rucosa ; liifesreiite-olivdci'd, piinvtif: ririilib/is rupiosi' radiatd. The bedecked Unio. Shell nearly orbicular, rather depressed, moderately concavely flexuous in tin mid- dle, posteriorly slightly truncated, concentrically \a- ricosely ridged, profusely irregularly wartcd ; ydluw- ish-olive, copiously rayed with green dots. Eafinesque, Mou. Coq. de la riv. Ohio, Ann. Gen. Sc. Phys. Brux. 1S20, vol. v. p. 287. Hab. North America. Very like the preceding species in details of character. but of quite a ditt'erent form. Species 46. (Mus. Cuming.) Unio PERNODO-SUS. Z7«. trxlil suhipiadrdio-omld, ^ declivi-expansd, deiiide triincutd, tnmido-veri verrucis ad aream poslicaiii plicnlo-riiJiinilibn. tescente-oVu-nced. The mucu-knotted Unio. Shell somcuhat s(| ovate, posteriorly slopingly expanded, then cated, tumidly warted, warts plicately radiali the posterior area ; yellowish-olive. Lea, Trans. Amer. Phil. Soc, Second Series, vol. \. Obs. vol. iv. p. 45. pi. .3. f. 8. Hab. North Carolina, North xUncrica. The posterior side ha- form, and its area is espei ranging in radiating folds •r qu August, 1864. Vnu PI MI Sowerty, del , etliUi ^mce] it B rooks, Imp . UN 10 I'l^. 4/. ■II. U. nodifenis, Conrail, i r. ScJioolcraflensk, clescri uodiileil vavifty of iit PI. I. Sp. 3. Species 48. (Mas. Cuming.) Umo INTEKMEDU'S. U)i. testu ■Vibquadrato-ovaiti, de- pressiuscidci, jjostici Jlexitoso-conlractd, concenlrict: pUcato-Hniid, verritcosn, verrncis ad aream pusticum pUcatu-radiantibus ; aurantio-liitfscente, viridi pj-ofme punctata. ■J'UE INTERMEDIATE Uxio. Shell somewluit squarely ovate, ratlier depresseol, po,l(riiuly ilcxuously con- tracted, concentrically plicalil\ liJ-vd, warted, warts on the posterior area pliiati ly i.idi.iiinL; ; orange- yellow, profusely dotted with green. CoNKAD, Anthony, MS. in Mus. Cuming. l£ab. North America. A prettily painted species, conspicuous tracted on the posterior side. flexuously con- Sper 'J. (Mus. Cuming. I Uu. testa oblique The u Tavoyensis. Un. testa oblique ovald, postice declici-dilatatd et obtuse angulaid, acute midato-cor- rugatd, rugis versus marginem. ventralem evanidis ; sordide oliraced. Tavoy Unio. Shell obliquely ovate, posteriorly slopingly dilated and obtusely angled, sharply zigzag wrinkled, wrinkles fading towards the ventral mar- gin ; dull olive. UouLD, Pro. Nat. Hist. Soe. Boston, 1843, vol. i. p. 138. Otia, Conch, p. 189. Hab. Tavoy, Burmah ; llev. F. Mason. This eastern Unio, it will be seen, type from the American species. totally ditferent Fig. ol>. The normal form of U. cicati-irosus, of teristic produced variety is given at I'l. \' Species 51. (JIus. Cuming.) Unio NODELATUS. Uu. testa su/mrbicu/ari, pox/ici- quu- drato-alatd, tuberculato-uodulatu. midiilis ai/iplis, pnii- cis, hitescente-olivaced. The noddled Unio. Shell nearly r>rliicular, posteriorly squarely winged, tuberculurly noduled, uodulr~ large, few ; yellowish-olive. Rafinesque, Mon. Coq. de la riv. Ohio, Ami. Oen. Se. Phys. Brux. 1820, vol. v. p. 287. Ilab. North America. Quadrately winged on the posterior side with llir nodules few and large. Species 52. (JIus. Cuming.) Unio states. Un. testa snbtrigond, c Jhruosi rolundato-angulatd, delude tru. rerrucatd ; virescente-olivacea . The stirkup Unio. Sliell somewhat tria posteriorly flexuously rotundately angle cated, obscurely warted ; greenish-olive Lea, Trans. Araer."phil. Soe. 1830, Obs. \ pi. 7. f. 8. Ilab. Alabama, North America. A shell of solid growth, contracted and U on the posterior side. ssn. po.s ',td, oby, This remarkably lobed shell i of which the female is given al I'l de U.JIe. UmvPl.JIV. ^yi^p Sowerby, del. e tilth. ';car.tErool^s,lTi\p. U N Species 54. (Mus. Ciiiiiiiig.) Unio Rangianus. Vn. ti'std siihohlomjo-ovnld, pustice llcxuoso-prodiwld, obsolete radiatim tnhercidald ; tides- i-ente-oUvitced, viridi linean-radiatd. Rang's Unio. Shell rather obloiig-ovnte, posteriorly flexiiously produced, obsoletely radiatcly tubercled ; yellowish-olive, linearly rayed with grecii/ Lea, Trans. .Vincr. Phil. Soc. 1S37, Ohs. vol. ii. p. 1)5. pi. IS. f. 56. //,,A. Ohio Kiv. r, North Aincrii-:i. 10. XIV. Lea, Trans. Amcr. I'liil. Soc. ISSH. Olis. vol. i. p. MCk pi. 17. 1'. 4k Unio nexus, Say. Ilab. Tennessee River, North Anicricn. A peculiarly gibbous species, in which the posterior angle bulges out on either side, as in the typical form of Hi/ssoarca. \('i ike r 'iMc with the tubeirh' Species 55. (Mus. Cuming.) L'nio PENITI'S. f'n. testa snt)trii)Ono-oblongd, yibbosis- shim, postici Jlej-iioso-tumidd et radiatim incisd, delude lute truncatd ; lidescente-olivaced. The tailed Unio. Shell somewhat triangularly oblong, very gibbous, posteriorly flexuously swollen and olive. CoNiiAD, Freslnvater Shells, p. 'i'-^. pi. ">. f. 1 Ilab. Alabama, North America. Distinguished by a produced swelling of tlie posterior ;ni"le. \vlii<'h is radiatelv incised. Species 5G. (Mus. Cuming.) Unio INTEURUPTI'S. Un. testa arcntito-securif orm i, postice lamido-aiigulatd, deinde declivi-truncald, medio sidi- compressd, ad aiujulmn radiatim crisputo-sidcatd ; tiUescente-oHvaced, viridi interrnple lineari-radiatd. The interrupted Unio. Shell arcuately wedge-shaped, posteriorly tumidly angled, then slopingly truncated, rather compresseil in tlie middle, railialely erLspately grooved at the angle ; yello« ish-nlive, interruptedly linearly rayed with green. Rafinesque, Moil. C^ocj. de la riv. Ohio, Ann. Gen. Sc. I'hys. Brux. 1S2U, vol. v. p. 2S7. I:iiiu breridi;,s. Lea. Ilul,. Ohio Uivei-. North America. ipresseit sliell, arena tlie angle of which is curved do .dIV swolle ^pecles (:\Ius. Ci Unio Auc.efokmis. Un. testa oblomjo-eijhildforiiii, ijih- tjosissimd, postice tiimido-anijuUild, deiiide tatissime truncatd ; sordid!; otivaced. The Arca-shaped Unio. Shell oblong-boat-sluiped, very gibbous, posteriorly tumidly angled, then very broadly truncated ; dark olive. Species 58. (Mus. Cuming.) Unio Sowerbyanvs. Uii. testa triffono-cordatd, pos/ici fexiwso-iinpressd et radiatim sulcata, aiitice laviijald , intense olivaced. Sowekby's Unio. Shell triangularly cordate, posteri<)rl\ flexuously impressed and radiately grooved, ante, riorly smooth ; dark oli\e. Lea, Trans. Amer. Phil. Soc. ISiJi, Ohs. vol. i. p. ISO pi. 10. f. 2S. Ilab. Tennessee, North America. Striately t;innved in a very <'liai'acteristic manner on tin posterior side, wliieli is eoneavely llexnoiis. Species 59. (Mus. Cuming.) 10 pileus. Un. testa trir/oiw-cordatd, postice concavd. deinde jlexiioso-triincatd, Ittmgatd: lidescente-olivaced viridi lineari-radiatd. The cap Unio. Shell triangularly cordate, posteriorly concave, tht>n llexnonsly truncated, smooth ; yellow- Lea, Train, .\iiur. I'liil. Soc. 1S30, Ohs. vol. i. p. U'.> Ilab. Ohio Kiver, Ninth Ameiiea. Reseniblin;;- U. S,iirrrbijaiiiis a good di-al in form. In the posterior side does not present the eliaracteristic groo' ing of that species. Species (!0. (.Mus. Cuming.) Unio SULCATUS. Un. testd oMongo-Donadfonui, uniice brevissimd, postice coin/iressi: proditctd, Jlexnoso-im- pressd, obsolete sutcatd ; lidescente-olivaced, fiisco-vi- ridi lineari-radiatd. The gkoovei) Unio. Shell oblong-Donax-shaped, ante- riorly very short, posteriorly compressly produced, flexuously impressed, obsoletely grooved ; yellowish- olive, linearly rayed with fuscous-greeu. Lea, Trans. Amer. Phd. Soc. 182!), Obs. vol. i. p. 4t. pi. 8. f. 13. Hub. Ohio Kivcr, North America. Unusually short oi eoinpressly produced iiiti rior side, the posterior 1 the manner of a Donax. September, 1864. Un IV PL XV. Qk ^% Scwerby.deI.et lith ■&iccntBrookh..lnip U N I Plate XV. Species 61. (Mus. Cuming.) UxiO DEVIATUS. Uil. ledii oblongo-qiiadratfi, an/ ice ab- breviato-atteiii'.aid, poslice ampliter expansd, augidarl- ler late truncatd; lulescente-oUvaced, viridi copiose ra- diatim Ibieatd. The deviating LTnio. Shell oblong-square, anteriorly shortly attenuated, posteriorly largely expanded, an- gularly broadly truncated ; yellowish-olive, copiously radiately lineated with green. Anthony, MS. in Mus. Cuming. Hab. North America. Truncately fan-shajjed on the posterior side, rather at- tenuated anteriorly. Species 62. (Mus. Cuming.) Unio Haystanus. Uii. testd ovuto-f/luhom, gibbomsdmd, poslice radiatim Uratd et lineari-snlcatd, liris versus warginem serratis, antice Imvigatd; lutescente-oVwacea. Hays' Unio. Shell ovately globose, very gibbous, pos- teriorly radiately ridged and linearly grooved, ridges serrated towards the margin, anteriorly smooth; yel- lowish-olive. Lea, Trans. Araer. Phil. Soc. 1832. Obs. vol. i. p. 147. pi. 3. f. 7. Ilab. Cumberland Piiver, North America. The posterior area is often defined by a prominent ridge- like swelling radiating to the ventral margin. Species . (Mus. Cuming.) Unio ridibundus. Tin. testa suboblongo-quadrald, gib- bositisctdd, antice sublatd, ventricosd, poslice ftt'xmso- tnmcatd, obscure lineari-sulcatd, liris versus marginem serratis ; lutescente-oUvactd, viridi Uneari-radiatd. The labghing Unio. Shell somewhat oblong-square, rather gibbous, anteriorly rather broad and ventricose, posteriorly flexuously truncated, obscurely linearly grooved, ridges serrated towards the margin ; yel- lowish-olive, linearly rayed with green. Say, Amer. Couch. Hab. North America. This closely resembles U. suh-atus, of which species Mr. Lea believes it to be the female. It differs malcriallv in respect of form, being more of an oblong square. Species 64. (Mus. Cuming.) Unio peesonatus. Uu. testd subqiiadrato-orbiculari, perobliqnd, gibbosd, poslice radiatim flexuoso-imdotd, lineari-snlcatd, nmbonibm prominenti/jiis ,• sordide fasco-olimced. The masked Unio. Shell somewhat squarely orbicular, very oblique, gibbous, posteriorly radiately flexuously waved, linearly grooved, umboes prominent ; dull fuscous olive. Say, Conrad, Monog. pi. 2-i. Unio capiUaris, Lea. Hah. Ohio lliver, North America. A round gibbose shell with prominent umboes radiately linearly grooved on the posterior side. Species 65. (Mus. Cuming.) Unio Edgarianus. Un. testa coinpressH cnneiformi, medio contractu, poslice declivi-angidatd ; lulescentv- olivaceu, nigricante-viridi copiose radiatd. Edgar's Unio. Shell compressly wedge-shaped, con- tracted in the middle, posteriorly slopingly angled ; yellowish-olive, copiously rayed with blackish-green. Lea, Trans. Amer. Phil. Soc. Second Series, vol. viii. Obs. vol. iii.p. 52. pi. 15. f. 30. Hab. Tennessee River, North America. A very compressed wedge-shaped shell, copiously ra- diately pencilled with very dark green. Species 66. (Mus. Cuming.) Unio Stewardsonii. Un. testd oblique qnadrald, gib- boso-conve.ru, poslice lui/iido-bipartitd, untice brecis- siind ; ltsvigatu,fnscescenle-olivaceu. Stewardson's Unio. Shell obliquely scpiare, gib- bonsly convex, posteriorly tumidly bipartite, ante- riorly very short ; sn\ooth, fuscous-olive. Lea, Trans. Amer. Phil. Soc. Second Series, vol. x. Obs vol. v. p. 34. pi. 23. f. 36. Hab. Cluitauooga River, North America. November, 1864. LNIO.— Plate XV. Ciiriousk bipnrtitc on the posterior side ; each part beinn- smooth and convexlv swollen. Species (57. (Mus, Cuming.) I'Nlo SACCULUS. Un. U'M subquadrato-ublotif/d, anlicc declm-contractd, postici late ampUter expansd, ob- scure radialim lineari-sulcatd, lidescente-oUvaced. The little bag Umo. Shell somewhat scpiarely ob. long, anteriorly slopicgly contracted, posteriorly broadly largely expanded, obscurely radiately li- nearly grooved, yellowish-olive. Anthony, MS. iu Mus. Cuming. Hab. North America. This partakes somewhat of the character of the preced- ing species, though not bipartite posteriorly. UnwPl.XVI. r% iiowerby, del et.lith MnceuL Broolts.Imp U N I Species 68. (Mus. Cuiuing.) UiS'lo NUCLEOPSls. Uii. testa oblique ovata, so/idit, pos- tice vix umjulatd ; lavigata,fidvo-oHvaced. The kernel Unio. Shell obliquely ovate, solid, poste- riorly scarcely angled ; smooth, i'ulvous-olive. CoNiiAD, Anthony, MS. in Mus. Cuniiiii;-. Hah. North America. Of very simple cliaracter. Species 09. (Mus. Cuming.) Unio Cii.\ttanoogaensis. L'h. testa peroblique cuncald, versus um&oiies Imnidd, antice brevissiiiid, postice atte- nuato-productd ; fiilvo-olivaced, nigricaiiie-vlridi con- centrici sitbremoti fasclald. The Cii.vtta.sooga Unio. Shell very obliquely wedge- shaped, swollen towards the umboes, anteriorly very short, posteriorly attenuately produced ; fulvons-olivc, concentrically rather distantly banded with dark- Lea, Journ. Acad. Nat. Sci. Phil, second series, vol. iv. Obs. vol. vii. p. 27. pi. 25. f. 30. ILiL. Chattanooga, North America. A very characteristic species, peculiarly obliquely wedge- shaped, painted with rather distant concentric bands. Species 70. (Mus. Cuming.) Unio Eaveneliensis. Un. testa oblique ovatd, compres- siiisc/ild, autice rotundatd, postice declici-productd, vix aiir/idatd ; bruimescente-olivaced. Ravenel's Unio. Shell obliquely ovate, rather com- pressed, anteriorly rounded, posteriorly slopingly produced, scarcely angled ; brownish-olive. Lea, Trans. Amer. Phil. Soc. 1832. Obs. vol. i. p. lU. pi. 3. f. 5. Ilab. Tennessee Eiver, Nortli America. A rounded form of oblique growth, compressed towards the ventral marniii. Species 71. (Mus. Cunii s. Un. tesld puruhliqiii I'ifortiii, iiiiibones crassd, gibbosd, autice alibreviato-lriiucatd, postice compresse elongato-productd ; luleseente-oliva- ced, nigrieaute-viridi obscure irregulariler concentrice fasciatd. The eallen Unio. Shell very obliquely wedge-shaped, thick and gibbous towards the umboes, anteriorly shortly truncated, posteriorly compressly elongately produced ; yellowish-olive, obscurely irregularly con- centrically banded with dark-green. Lea, Trans. Amer. Phil. Soc. 1830. Obs. vol, i. p. 103. pi. 13. f. 23. Hab. Alabama Eiver, North America. Peculiarlv thick and heavv about the umbces. Species 72. (Mus. Cuming.) Unio muxdvs. Uu. testa sublaii cune'iformi, crassd, au- tice brevissimd, postice oblique decUvi-productd ; ful- vescente-olivaced, viridi concentrice maculatd. The neat Unio. Shell rather broadly wedge-shaped, thick, auteriiirly very short, posteriorly obliquely slopingly pimliirid ; fulvous-olive, concentrically blotched Willi -ivrn. Lea, :\IS. in Mus. (Auuiug. Hab. North Aiiieiica. Of a broad wedge-shaped form, with the green colour- ing in concentric band-like blotches. Species 73. (Mus. Cuming.) Unio cuneatus. Un. testa oblongo-cuneiforml, valde cowpresm, medio contrricld, postice declivi-productd, vix augulutd ; Jaho-olicaced, viridi radiatim macu- latd. The vvedge-shai'Ed Unio. Shell oblong wedge-shaped, very compressed, contracted in the middle, posteri- orly slopingly produced, scarcely angled: fulvous- olive, radiately blotched with green. Eafinesque, Mon. Coq. de la riv. Ohio, Ann. (ien. Sc. Phys. Bru.x. 1S20, vol. v. p. 287. Ilab. North America. A very compressed painting not in eonceii ith tl November' 1864. UNIO.— Plate XVI. Speoics 7-1. (Mils. Cuiiiiug.) Unio AVoonwAKUiANUs. Vn. testa mbtngono-ovatd, pa- rum cuneiformi, aulice mbproditctd, rutumlata, postice angidalo-productd, area posticd exililer Ibieari-sul- catd ; flavido-virescente, intense viridi, radio fim nacu- Md. Woodwakd's Unio. Shell soiUL'what triangularly ovate, Imt little wedii-e-sliaped, anteriorly rather produced, rounded, j)osteriorly angularly produced, the pos- terior area faintly linearly grooved ; yellowish-green, radiately blotciied with dark -green. Lea, Pro. Acad. Nat. Sci. Phil. 1857, p. 170. Obs. vol. vii. p. 17. pi. 23. f. 82. Ilab. Georgia, North America. Of a delicate greenish-vellow, nuliately blotched with dark-green. UnwFLXVll. (^ ^ Scjwerby, del oL liUi "Vincent Brooks. tap. UN 10 Species 75. (ilus. Cumiiig.) Unio lenior. Uii. testa ohlongo-ocatd, temdculd, antic!; attenuato-rotundatd, posfice lata prodiicld, gibbosius- ciild, ad extremitatem Jlexuoso-siibpartitd, prope mar- giiwm linean-sulcatd ; fulvescente-olivaced. The smoother Unio. Shell oblong-ovate, rather thin, anteriorly attenuately rounded, posteriorly broadly produced, rather gibbous, flcxuously subpartite at the extremity, linearly grooved near the margin ; ful- vous-olive. Le.\, Trans. Anier. Phil. Soc. 184.0. Obs. p. 42. pi. 15. f. IS. ILih. Tennessee, North America. A delicate, small species, having somewhat the appear- ance of a Modiola. Species 76. (Mus. Cuming.) Unio H.\nley.\nus. Un. testa obloiigo-cuneiforini, cras- siusculd, versus umbones gibbosd, utriiKiue rotinuhild, latere postico oblique decUvi, vix angulato ; fulw-oU- raced,fusco coiicentrice remote fasciatd. H.inley's Unio. Shell oblong wedge-shaped, rather thick, gibbous towards the umboes, rounded at each end, posterior side obliquely sloping, scarcely angled ; fulvous-olive, concentrically distantly banded with brown. Le.\, Trans. Amer. Phil. Soc. Second Series, vol. x. ; Obs. vol. V. p. 35. pi. 33. f. 37. Jlab. Georgia, North America. Of a gibbous, oblong-ovate form, although partaking of the character of the wedge-shaped species of the preceding Plate. Species 77. (-Mus. Cuming.) Unio medius. Uu. testa oblhiue cniieifurmi, uiitice valde (/ibbusd, postice attenuato-compressd, obscure Jlexuoso- aiii/ulatd; fulvo-olivaced, fasco coiicentrice remote fas- ciatd. The middle Unio. Shell obliquely wedge-shaped, an- teriorly very gibbous, posteriorly attenuately com- pressed, obscurely flexuously arigled ; fulvous-oli' concentrically distantly banded with brown. Lea, Pro. Acad. Nat. Sci. Phil. IS'il. p. 40 ; Ob., vol. \ p. 82.pl. 10. f. 227. llab. Alabama, North America. Particularly swollen and gibbous towards the umboes Species 7S. ("Mus. Cuming.) Unii) suBROSTR.iTUS. Uii. testd elomjatu-ovatd, cotiipns- siusculd, utrinque rotunduld, postice subattenuatd, la- viijald, obscure concentrice riigatd; lutescetite-oUiiaced. riridi nndique intemipts radiatd. The slightly-beaked Unio. Shell elongately-ovate, rather compressed, rounded at each end, posteriorly rather attenuated, sraootli, obscurely concentrically wrinkled ; yellowish-olive, interruptedly rayed through- out with green. S.iY, Anthony, IMS. in Mus. Cuming. Hub. North America. There is a marked regularity about the interruptedly- rayed painting of this species. Species 79. (Fig. «, male ; Fig. b, female ; Mus. Cuming.) Unio Caps.'eeoumis. Vn. testd ovatd, tenuiculd, autice attenuato-rotundatd, postice interdnm decUvi-angulald, interdum late compresse expansd ; virescente-olivaced, intense viridi eopiose Uneari-radiatd el tinctd. The CaI'sa-shaped Unio. Shell ovate, rather thin, anteriorly attenuately rounded, posteriorly sometimes slopingly angled, sometimes broadly eompressly ex- panded; greenish-olive, copiously linearly rayed and stained with dark-green. Lea, Trans. Amer. Phil. Soc. ls:jl ; Obs. vol. i. p. I4:i. pi. 2. f. 4. llab. Cumberlau.l liiver, North America. The two specimens here figured are giviMi, on the au- thority of Mr. Anthony, as the n.ale and female of the same species. Novemljcr, 1SC4. UNIO.— Plate XVII. Species Hi). (Mus. Cuming.) Unio tuugidulus. Un. lestf'l sitlicordato-ovatd, gibbosd, antice rotundald, posiice Jlexuoso-triangulald, obscure lineari-sulcald ; pallide virescenie-olivaeed. Till-: SLIGHTLY-SWOLLEN Unio. Shell somewhat cor- dately ovate, gibljous, anteriorly rounded, posteriorly ilexiionsly two-augletl, obsfiirely linearly grooved ; pale greenish-olive. Lea, Pro. Acad. Nat. Sci. Phil. 18.58, p. 40 ; Obs. vol. viii. p. 6(5. pi. 5. f. 211. Ilab. Cumberland lliver, North America. The posterior side of this sijecies is lightly 'ii ; Obs. vol. i. p. 1S4-. pi. 11. f. 31. Unio pectorosiis, Conrad. Hah. Tennessee, North America. A prettily-rayed species of very regul rowth. Species S;?. (Mus. Cuming.) Unio vittatus. Un. testd subquadraio-ovntd, xuhob- liqud, teniii, antice rotiindatd, postice siihqiiiidrato-ex- pansd, iriinattd, lavigatd, nitente, creberrime concen- trice fdo-striatd ; sordidefuloo-olivaced. The filleted Unio. Shell somewhat squarely ovate, rather oblique, thin, anteriorly rounded, posterioriy somewhat scjuarely expanded, truncated, smooth, shining, very closely concentrically thread-striated, didl fulvous-olive. Lea, Pro. Acad. Nat. Sei. Phil. 1S50, p. 153; Obs. vol. vii. p. i;7. pi. 38. f. 12S. Ilab. Australia. A thin ^HOf/w«-likc .species of a peculiar dull fnlvon- olive colour, sculptured throughout with close-set con- centric thread-like strise. Species 81-. (Mns. C\uning.) Ukio obesus. Un. testd ollongo-lrupezoided, yibhosiiis cii/d, antice brevissimd, rolundatd, postice declive quad- rato-angutatd, trtincatd, olivaceo-uigrd, epidennidt rngoso-striatd. The stout Unio. Shell oblong-trapezoid, rather gib bous, anteriorly very short, rounded, posterioi'l} slopingly quadrately angled, truncated, epidermis rugosely striated. Lea, Trans. Amer. Phil. Soc. 1830 ; Obs. va pi. 13. f. 2G. Ilab. York Eiver, Virginia, North America. A coarsely-striated shell, nnuli prodneed into a sloping truncated angle. .ck. Liber, 18(;4. UmePl.XJX. Vjncent Brcckslmp U N I 0. Plate XIX. Species 85. (Mus. Cuming.) Unio Mississippiensis. Un. testa oblonjd, postice sub- lanceoJato-aiigulatd, antice rotundatd, Icfvigatd ; fiilvd, oUcaceo tinctd, intense viridi copiuse radiald. The Mississippi Unio. Shell oblong, posteriorly some- what lanceolately angular, anteriorly rounded, smooth, fulvous, stained with olive, copiously rayed with dark-green. CoNEAD, MS. in Mus. Cuming. Ilab. Mississippi River, North America. A dark-rayed species, peculiarly lanceolately angular on the posterior side. Species 86. (Mus. Cuming.) Unio rectus. Un. testa elongato-ovatd, antice latiore, brevi, rotundatd, medio subcompressd, posiice attenuato- prodnctd ; fulvo-olivaced, plus minus viridi radiatd. The straight Unio. Shell elongately ovate, anteriorly broader, short, rounded, somewhfit compressed in the middle, posteriorly attenuately produced ; fulvous- olive, more or less rnyed with green. Lamarck, Anim. sans vert. vol. vi. p. 537. Mya 2'rtBlonga, Wood. Ihiio prtelongus, Barnes. Hab. North America. A fine species of heavy substance, sometimes narvowf and more lanceolate than the siieeimen figured. Species 87. (Mus. Cuming.) Unio Anodontoides. Un. testa elongato-ovatd, antice brevi, rotundatd, postice acuminato-productd, leevigatd, poind ; pallide cinereo-fulvescente. The Anodonta-like Unio. Shell elongately ovate, anteriorly short, rounded, posteriorly acuminately produced, smooth, polished; pale ash-fulvous. Lea, Trans. Amor. Phil. Soc. 1830; Obs. vol. i. y. '.»L pi. 8. f. 11. Unio teres, Conrad. Hab. North America. This species, as its name implie- appearance of an Anodonla, but the si much iliv thi UnicFl.XX. VmoentBrooksJmp. U N I 0. Specie^ SS. (Miis. Ciiiuini]!.) Unio Buddianus. Un. testa, elongato-obloiigd, gibbosd, antiee brevissimS, rotundatd, postice angulato-prodiicld, ad extremitatem oblique subquadratd ; nigrd. Bldd's Unio. Shell eloiipjately obloiip;, gibbous, anteriorly very short, rounded, posteriorly angidarly produced, obliquely subquadrate at the extremity ; black. Lea, Trans. Anier. Phil. Soc. 1843; Obs. vol. iv. p. 33. pi. 40. f. .5. Ilab. Florida, North America. A black shell, obliquely subquadrate at the posterior extremity, the angle being conspicuous, but rather obtuse. Species 89. (Mas. Cuming.) Unio cucumoides. Uh. testa elongalo-oblongd, antice brevi subattemiato-rotundatd et concentrice rugosd, postice oblique subquadratd, valde produdd, midique ■peculiariter corrvgato-verrucosd ; nigrd. The cucumber-like Unio. Shell elongately oblong, anteriorly short, somewhat attenuately rounded, and concentrically wrinkled, posteriorly obli(piely sub- qnadrate, very much produced, peculiarly coiTugately w;irted throuc'hnut : lilnck. Lea, Trans. Araer. Phil. Soc. 1S40; 01)s. vol. iv. p. 311. pi. 7. f. 3. Hub. Hunter's liiver, New South Wales. A bold, black species, considerably obliquely produced on the posterior side, where it is sculptured nith diversely radiating wrinkled warts. Species 90. (Mus. Cnniiiig.) Unio SiiEPAEniANUs. Un. testa flexuoso-lanceolatd, me- dio covipressd, antice brevissimd, rotundatd, postice valde product a, obtuse angulatd, delude acuminata; nigrd. Shepakd's Unio. Shell fle.\uously lanceolate, com- pressed in the middle, anteriorly very short, rounded, posteriorly very much prod\iccd, obtusely angled, then acuminated ; black. Lea, Trans. Amer. Phil. Soc. 1834; Obs. vol. i. p. 307. pi. 13. f. 38. Hub. Georgia, North America. Curiously distinguished by the narrow, llexuous jiro- longation of the posterior side. January, 1865. ImcPlIXl Sov(crby,dd eLlilh Yincem Br„i,.s m\p U N I . Plate XXI. Fi-. 91. (Mils. Cuming.) The shell here figured is a typical speciiuLMi of th I'liiu aU'i- of Nilssoii, which h:is been prouoiiuci-d by Le to be one of the nuuierons European fornix of MiinjariUub Maryarllifirn. Species 92. (Mns. Cuming.) Unio meli.eu.s. Tin. lestn oblonyu-ovatd, coiHprenuimcidd, pudice eUlpllco-expansd, latere anlico rotnndato, pos- tico obsolete migulato, conceiitrice dense Urnto-striald, ad itiiihones plinafo-corrugatd ; oUviiceo-stnimined. Tmo HONEY Unio. Shell oblong-ovate, rather com- pressed, posteriorly elliptically expanded, anterior side rounded, posterior obsoletely angled, densely concentrically riilge-striatcd, plicntely wrinkled at the uinboes; olive ^traw-colour. Le Pro. Acad. Nat. Sci. Philad. 1S59, p. 1 vol. vii. p. 68. pi. 38. f. 109. an olive straw-eolour, elliptically expa ly ridge-striated throughout, with the ui •'wrinkled. Obs Species 93. (Mus. Cnniing.) Unio Patagonicus. Un. testa eUiptko-ovatd, coiiipres- siiisc/ild, pustlce obtuse anyulatd, latere antico rotun- dato, postico expaiiso, cunceiitria- filo-striatd ; nigri- cante-fused. The Patagonian Unio. Shell elliptically ovate, rather compressed, posteriorly obtusely angled, anterior side rounded, posterior expanded, concentrically thread- striated; dark-brown. D'OlUilGNY, Voy. dans I'Anier. Mend. pi. 70. f. 1 to 4. JIab. Patagonia. A rather compressed elliptieally-ovate shell, concentri- cally thread-striated throughout. Species 9i. (Mus. Cuming.) Unio naslitus. Un. testa eloitgato-ovatd, latere antico rotuiidato, posiico elliptico-aiigiilato, versus extremita- ti'M acnmlnalo-rostraio ; nigricante-olhaced, viridi ohsenre rudiiitd. The liEAKEU Unio. Shell elongately ovate, anterior side rounded, posterior elliptically angled, aciimi- nately beaked towards the extremity ; dark-olive, ob- scurely rayed with green. Say, Swainson, Zool. lllus. 1st Series. 3I^a nasulu. Wood. Uino rostratus, Valenciennes. E/iri/nea nnsuta, Stimpson. Hab. North America. Distinguished tremitv. itieally-beaked po^t^ S|)eeies 9.5. (IMus. Cuming.) Unio FrsCATUS. I'n. testa oblougo-ovald. latere aiilicu rotitndato, postico arciifito-siibqKudruto, vir. angnlatii ; 11 hjrican te-olivuced. The brown Unio. Shell oblong-ovate, anterior side rounded, posterior arcuately subquailrate, scarcely angled; dark-olive. Lea, Trans. Amer. Phil. Soc. 1843. Obs. vul. iv. p. 3.5. pi. 40. f. 4. Hab. Florida, North America. The poster or truncated. species 13 somewhat : Species 9G. (Mns. Cuming.) Unio Shanghaiensis. Uh. testa elongato-ovatd, (jtb- bosd, latere antico rotmtdaio, postico eUiptico-aciimi- itato ; nigrieaute-viridi . The Shanghai Unio. Shell elongately ovate, gibbons, anterior side rounded, posterior elliptically acumi- nated ; dark-green. Lea, Pro. Acad. Nat. Sci. Philad. 1S59, p. 153. Obs. vol. vii. p. (iO. pi. 36. f. 121. Ilab. Shanghai, China. A narrowly-ovate shell, conspicuously gibbous in form. A brii :d fi-Ul Fig. 97. (Mus. Cuming.) Iit-coloured variety of U. Jiiodaiitdides, dcseribi Hi from an older specimen at PI. XL\. Sp. 87. April, ISO UnwFlXIII. V incertt B roolts irr.p U N I 0. Plate XXII. Species 98. (Mus. Cumiug.) Unio LITOKALIS. Uii. iesld ovatd, subaquilalerall, versus ■marginem compressd, latere anlico rotundato, postico decl'wi-expanso, umbonihiis snbiimpUs, olisciir? pUcato- corrugatis ; liitesceiUe-oliimced, viridi /wefiri-radiadi. The litoeal Unio. Shell ovate, nearly equilateral, com- pressed towards the margin, anterior side roundi-ii. posterior slopingly expanded, umboes rather large, obscurely plicately \vriukl(.-d ; yellowish-olive, linearly rayed with green. CuviER, Hist. Nat. des .\.niiu. vol. i. Unio crassus, Eetz. Unio brevialis, Lamarck, Uuio semirugala, Lamarck. Uuio nana, Lamarck. Uiiio subtelragona, Mieluuul. Unio incurvus, Lea. Unio Pianensis, Fariues. Unio granosus, Schuuuieher. Unio briomeiis, Bonhomme. Unio Woolwichii, Morelet. Unio rhoinbuiJea, Sehreibers, llab. Europe. Of a compressed CrassatMa-Xykt: form, generally much Sjiecies 99. (Mus. Cuniiiii;.) Unio Demeuaraensis. Uv. hsld eUiptico-ovnld, hiU-n- ant ICO dedivi-rotunditto, postico truncato-angulaio, con- centrice denw filo-slrlalil ; nigricfinte-olivaced. The Demerara Unio. Shell elliptically ovate, anterior side slopingly rounded, posterior truncately angled, concentrically densely thread-striated ; dark-olive. Lea, Pro. Acad. Nat. Sci". I'hilad. IS.VJ, j). 15:2. Hab. Demerara. A sii stance. i|)tically-trLincated shell, of ratiier rounded, posterior slopingly expanded, obsoletely gled, umboes wrinkle-striated; yellowish-olive. Lea, Pro. Acad. Nat. Sci. Philad. 1850, p. 153. llab. Borneo. A shell of simple chnracter, b>it very neatly wrink about the umboes with raised thread-like stri;e." Species 101. (Mus. Cuming.) o TESTIBINEUS. Un. tcstd siiboUongo-OKatd, later,' anlico cuiaprcssiitscah, cunccntrice teniiilirato, postico trnncato-expanso, versus uinbones obtuse artgulato ; li- vido-oUvaced. ; TORTOISE-SHELL Unio. Shell souiewhat obloug- ovate, anterior side rather compressed, coneentriealiv finely ridged, posterior truncately expanded, obtusely angled towards the umboes; livid-olive. UCLirr, Moll. tcrr. et ttuv. de Port. . liio Usumasiuto, Pi//u~ lata ; olivaceo-fuscd. The scarlet Unio. Shell somewhat squarely ovate. thick, anterior side slopingly rounded, posterior trnncately angled ; olive-brown. Lea, Traus. Amer. Phil. Soe. 1834. Obs. vol. ii. p. IL'. pi. 5. f. 12. Uuio catUliis, Conrad. JIab. Ohio Eiver, Nortli America. The interior of this species is sometimes white, but generallv of a deep salmon-ved colour. Unie PI XI/H. Vincent Broote.Imp- U N I 0. Species 105. (^lus. ('umiuy.) Unio Thwaitesii. Vh. /cs/ii nm/ii, covipressimculii, la- tere aulico courcliiln-rutiiiiiliilo, posiico oblique la& expanso, lav'ujatii, ami iiiiihuiics exiUter pUcato-corru- gatd ; flavescente-ljruuiied, concenirice fiisciatd. TinvAiTEs's Unio. Shell ovate, rather compressed, an- terior side contractedly rounded, posterior obliquely broadly expanded, smooth, faintly plicately wrinkled about the umboes , yellowish-browu, concentrically banded. l.EA, Pro. Acail. Xat. Sri. Philad. IS.V..), p. 15:3. link. Cevlon; Thwaites. Concentrically banded wit! lowish ground. ni upon a yt Species lOCi. (Mus. Cuming.) Unio kotundatus. ?'». testit late elUplicd, crassinsciild, latere antico decUvi-rotiiudalo, podico oldiqna late truncato, obtuse angulnlo, ad anijnliim liiiiihlo, wediu cerrucose plicato-co)ri1(I. () pi. 7. f. 3. Hab. Tennessee, North America. A solid wedge-shaped fulvous shell, blotches of green on the posterior angle. Species lOS. (Mus. Cunuug.) Unio Beklandieuii. Uu. testd ovatd, veutricosd, um- bouibus tniiiidis, latere antico coarctato-rotuiidato, publico oblique lull' truncato, snperne compresse ututo ; fulcd, nigricante-olirareo tinctd, uitente. Berlandiek's Unio. S1u;I1 ovate, ventricose, with the umboes swollen, anterior side contractedly rounded. posterior obliquely broadly truncated, compressly winged at the upper part ; fulvous, stained with dark olive, shining. Lea, Pro. Acad. Nat. Sei. I'hilad. 1S57, p. 101. Hab. Mexico. Texas. Of a distinct and ver\ rharael.iistie type, in which tl epidermis is shining aud horny. Species 109. (Mus. Cuming.) Unio altilis. Uu. testa ocatd, teuui. ventricosd, later,- aulico subalteuuato-rotmidato, postico late: obtuse an- gulatii ; Jldcesceute-olipaced, uigricante-viridi liuean- radtutd. The fatted Unio. Shell ovate, thin, ventricose, anterim- side somewhat atteruiately rounded, posterior broadly obtusely angled; yellowish-olive, linearly rayed with dark-given. CONKAD, Preshwater Shells, [). 13. pi. ;.>. f. 1. Hab. North America. A light ventric.Kc shell. |irrilily rayrd with dark-green upon a yellowish-ohve ground. Species 11(1. (Mus. Cuming.) 1"nI0 NaI'EANEN-^IS. r„ Ir.ld „h!„ii,jn-or„ld , latere ,.,< tico snljatlenualo-rnlinnhiln, juislico tali' truncato-n. tundalo, vix augulnhi. vircu uiiibouis auijililer pliciih, corrugntd ; fusco-ui_i;i 'C'lule. April, ISG." UNIO.— Platk XXIII. The Napeax Unio. Shell oblong-ovate, anterior side somewhat attenuately rouuded, posterior broadly truncately rounded, scarcely angled, largely plieately wrinkled about the umboes ; fuscous-black. t'oNKAL), ;MS. in JIns. Cuming. llnb. ■ ? A pitchy-black shell, of rather light substa coarsely plieately wrinkled about the umboes. nmhonibus immik, latere unlico ruluudato, poHlco clecUvi-lruncaio, haud angulato ; fuho-viridi, bnaines- cente tinctd, laviyatd, rdtenle. Layard's Unio. Shell rather obliquely ovate, ventricose, umboes swollen, anterior side rounded, posterior side slopingly truncated, not angletl ; fulvous-green, tinged with brown, smooth, shining. Lea, Pro. Acad. Nat. Sei. Philad. 1«.51», p. I5;J. Hub. Ceylon ; F. l.ayard. Species 111. (Mus. Cuming.) iiDi. Un. Ifstd ssiiboblique ovata, cmtncom, \ Of an Anodou- homy epidermis. ike fori: ed bv UnivPi.xxn: Vincent Brooks, Imp. U N I Spucies 11:?. (Mus, Ciimiiig-.) 10 MUTABiLis. I II. tesld eloiiguio-oblo)ig(l, latere an- lico alteniialo-rotiiiidalo, postico declivi, delude tmi- Sculpti manner. ricatelv wriiikl.'d i/f/iie •de coii- cato-rotuuduto, medio siihcompress, cenfrici strintn ; fitsco-niyricante. OHANGEABLE IlNin. Sliell elongately oblong, ante rior side atti'iuintcl\ rouiuli'd truncatelyroniiilr,!. -l^hi \\ r rudely concentrii':ill\ -iriiitr bl;iek. , Pro. Acad. Nat. Sei. riiihul . Brisbane Water and ilnna- lor sloping, then I'll in the middle, ghout ; fuscons- Anstra Covered with a noarse, generally much eroded. lied epidi Species 113. (Mus. Cuming.) o FlSHERlANUS. Uii. tesld lanceolato-ohloiiijd, teiiiii- riihi, coiiipressu, vnlde hi(rqitUnlerall, liilere anlieo brevi, rotiiiulato, poslico decllri-aciih/iHiilu ,- J'lilro- hriiinifil. ier's Unio. Shell lanceolately oblong, rather thin, compressed, very inequilateral, anterior side short, rounded, posterior slopingly acuminated ; fulvons- lirown. , Trans. Anier. Phd. Soc. 1S34. Obs. vol. ii. p. S. pi. 4.. f. 8. . Chester River, Maryland, Xorlh Ameri-a. istingnished by the slender acnniinutcMl ot Species 114-. (Mus. Cuming.) sio NAVIGIOLIFOllMls. Uii. tesld snhquadrato-obhiifju , crasuascnUi, lulere oiiliro bred, acKiiiinato-roliiiidiito. pudico abriiple tnnicuto, imdiqie dense filo-slriatd, snperiie divaricato-rudiatd ; fusco-iiigrieaiite. Hi KOAT-SHAPED Uxio. Shell somewhat squarely ob- long, rather thick, anterior side short, acuminately striated throughout, divaricately rayed at tlic upper part; I'uscous-blaek. .A. Pro. Acad. Nat. Sei. Philad. 18.59, p. oi. Species 115. (Mus. Cuming.) Unio PUurURATUS. Vii. lestd snbriuadnilo-ovatd, riilde inceqiiUatenilK latere aiilico jmrm. alleiniiitu-rotn)!- dalo, jjoslieo Into, oenlricosu, expanso-rutiiiidalo, w/- periie siibaluto ; fii.sro-iiii/ricaiite. The pi'rpi.ed In hi. Shell somewhat squarely ovate, very incquilali nil, andrior side small, attenuatelv rounded, jio^tcriiM- l)r(iad, ventricose, eNpandrdly black. Lamarck, Anim. sans vert. vol. vi. p. 533. ^fl/a vei/trieosn, Solander. I'liiu oler. Lea (not of Nilsson). r„io hnjiibris. Say. r„h, Uu„ho„;, C'nuv.nl. llnb. Louisiana, North America. Piemarkable for the large, veutricose, obliquely-expaiidrd proportions of the posterior side. The interior is generally of a rich llurpli^ll salnion-colonr. Species IIG. (Mus. Cuming.) UjvIO HaLEIAMS. Vn. tesld omtd, lemneidd, venlricosd, latere anlieo rutinidalu, postico oblique aciiiuiiiuto, sn- jieni'e siibalato, innboiiibiis pUcalo-eorriirpitis ; olivuceo- niijriiiinU'. Hale's I'mo. Shell ovale, rather lldu, veutricose, an- terior side rounded, posterior obliipiely acuminated, slightly winged at the upper part, nmboes plicately wrinkled; olive-black. Lea, Trans. Amer. Thil. Soc. lSt:L Obs. vol. iii. p. s |. pi. 27. f. r,:!. Uab. Mississippi, near New Orleans, Xorlh America. The epidermis of this species is of a delicate vehety character. Species 117. (-Mus. Cnmiug.) Unio CoCODUENSIS. Un. tesld oblomjo-ovald, versus iitnrijinem coiepressiuseald, lulere aiiitco roliiiiduto. UNIO.— Plate XXIV. postico oblique angulato, deinde acuminalo, siipertie | subalaio ; fulvo-olivaceu, intense viridi tinctd et ra- diatd. The Cocodu Umo. Sliell oblunsf-ovate, rather (■oiii- pressed towards tlie iiiargin, auteriur side rounded, ])osterior obliquely angled, then acuminated, slightly winged at the upper part ; fulvous-olive, stained and rayed with dark-grceu. White, MS. in Mus. Cuming. Uah. ? Of the describing and naming of this species 1 kuo« nothing, but it is a very characteristic one. Species ilS. (Mus. (kiniing.J Unio MohetoMCL-s. I'll, testa lute iMiiiiijd, latei\ dedivi-rotundato, postico obliqiit' cini/alalo, dc, liqiie triincato ; fiisco-nigricaiitr. The MoiiETON Unio. Shell broadly obloui;. : side slopingly rounded, jiosterior oblu^i'l\ then obli(|uely truncated; fuscous-black. Uab. Tasmania. Moreton Bay, Australia. ntitica „de o/,. A rather coarsely s not agreeing, so far described species. riatc shell, of simple eliani ■an luakr cut, uith ^ I UnicPl XXV. Sowerby.ael.ethiJi VmcenL Brookslinp. U N I 0. Species 119. (Mus. Cun Un'IO GrayaNUS. I'll, testa eloni/ato-lanceolata, cram- uscidd, snperni laid plaiiald, latere antico breDtssimo rotitudaio, poslico loiiymimo, a>igulalo-acuininato, circa uiiiboues divaricatim plkato-currugatd ; olicaceo-viridi. Gkay's Unio. Shell elongutely lanceolate, rather thick, broad and flattened at the upper part, anterior side very short, rounded, posterior very long, aug'ularly acuminated, divaricately plicately wrinkled about the uraboes ; olive-green. Lea, Trans. Amer. Phil. Soc. 1832. Obs. vol. i. p. 178. pi. 9. f. 26. Hab. China. Ueniarkable on account of posteriorly acuminated form. extremely narrow and Species 130. (Mus. Cuming.) Unio Vignonana. Un. tesld oblomjd, medio coniprensu, latere antico declici-rotundato, poslico declivi-tru/icuto, obtuse angulalo, imdique coiisjjiciie dioaricutim corru- patd ; olivaceo-iiigricante. The Vignon Unio. Shell oblong, compressed in the middle, anterior side slopingly rounded, posterior slopingly truncated, obtusely angled, conspicuously divaricately wrinkled throughout ; olive-blaek. Beknardi, MS. in Mus. Cuming. /lab. ? The whole surface of this shell is curiously divaricatelv wrinkled. Species 131. (Mus. Cuming.) 10 ELECTlllNUS. Uit. tesld siibq/iaJrato-obtom/d, coiu- pressd, latere antico rolmidaio, postico oblique triiii- cato, superiie sabalato, ad umbones pUcato-corriigatd ; fulvo-slramiiicd, lieviijatd, vet teutdstriald. E AMBER Unio. Shell somewhat squarely oblong, compressed, anterior side rounded, posterior obliquely truncated, slightly winged at the upper part, jdi- cately wrinkled at the umboes ; fulvous straw-colour, smooth, or finely striated. ■« Sagii, Ward (not of Tappau). Of a peculiar pale-fulvous str being thin and nearly smooth. Species 133. (Mus. Cuming.) Unio LUTULENTUS. Un. tesld .snbqnndrato-nblongd. valde cumpressd, latere antico modice rolitndato, postlcu de- clivi-e.rpauso, delude truucato, coucealrice rude plicato- striatd ; nigra. The JiuuDY Unio. Shell somewhat squarely oblong, very compressed, anterior side moderately rounded, posterior slopingly expanded, then truncated, concen- trically rudely plicately striated; black. Gould, Pro. Nat. Hist. Soc. Boston, U.S. 18.50, vol. vii. [lab. Kew Zealand. Of a peculiarly compressed fori general aspect of a Ulgciuieris. with somewhat of tl es i;:3. (Mus. Cuming.) I'n. testii elongalo-oblongd, later Unio ricToRUM roluudato, poslico modice declivi, subacuminalo , olicnced. The painters' Unio. Shell elongately oblong side rounded, posterior moderately slopir what acuminated ; fulvous-olive. Mya pictorum. LinuKus. Sysl. Nat. lOth i-dit. p Unio pictoriim, I'lulippson. Unio rostrata, Lamarck. ISlijsca piclorum, Turton. Unio liiuosus, Nilsson. Unio Turtoni, Payrandeau. Unio Requieui, Michaud. Unio Dcsliaijesii, Michaud. Unio longiroslris, Ziegler. Unio Ardusianus, Renies. Unio ponderosiis, Spitzi. Unio Aleronii, Couiiianyo and .Massun. Uniu dacliihis, Morelct." Unio muculns, .MnivK't. Unio I'Inlippi, Dupuy. Unio platgiiiicliuides, Dupuy. Unio Roussii, Dupuy. Unio curvirostris, Dupuy. fnlvo- nterior April, li UNIO.— Plate XXV. Hub. Europe. Siberia. North Africa. Of a clinracteristic fulvous-olive colour ami elongated form, very generally distrilnited tluougliout Europe, Si- l)eria, and North Africa. Species 124. (Mus. Cuming.) Unio tumidus. Tin. testa ovato-cuneiformi, gibbuso-tu- midd, latere aiitico rotimdato, postico decUve obtuse angulnto, deinde acuminata, umbonibus plicato-corm- gatis ; olivaced, viridi palUde radiatd. The swollen Unio. Shell ovately wedge-shaped, gib- bously swollen, anterior side rounded, posterior slo- pingly obtusely angled, then acuminated, umboes plicately wrinkled ; olive, faintly rayed with green. Philippson, Nov. Test. Gen. p. 17. Unio ovalis, Philippson. Mya ovalis, Pulteney. Mya depressa, Donovan. Mya ovata, Donovan. Unio rostratm, Studer. Mysca ovata, Turton. Mysea solida, Turton. Unio infntKS, Hecart. Unio Michatidianus, Desnioidins. Unio arciiatus, Bouchard-Chantereiix. Hub. Northern and Central Euro])e. Distinguislied from the preceding species by its broach'r and more swollen form, by the umboes being plicately wrinkled, and by its rayed painting. Its geographical distribution is moreover different, being confined to North- ern and Central Europe. Species 125. (!\Ius. Cuuiiug.) Unio verecundis. Uh. testa ovata, teniiicitld, latere antico rotundalo, postico oblique turnido, superne sub- alato ; fulm-aruginosd, viridi fasciatd. The modest Unio. Shell ovate, rather tliin, anterior side rounded, posterior obliquely swollen, slightly winged at the upper part; fulvous-bronze, banded with green. Gould, Pro. Nat. Hist. Soe. Boston, U.S. vol. iii. p. 292. Hub. Manila, Island of Luzon, Philippines. Of a simple .'/HO(/o«-like form and peculiar bronze hue of colour. rnwPl.XXVI. ^^% Vincent Br ooks, I:n 7. U N I . XXV Species 126. (Mus. Ci Unio Ingallsiancs. Uu. tedd mbelomjato-ovatu, gih- bosiusculd, anfice rotuudald, •postki dec/ive aiiguluiu- aciiminaid, lavigatd ; intense viridi. IxGALLs' Unio. Sliell somewhat eloiigately ovate, ra- ther gibbous, anteriorly rounded, posteriorly slopiiigly angularly acuminated, smooth ; dark green. Lea, Trans. Araer. Phil. See. 18.52 ; Obs. vol. v. p. 38. pi. 2i. f. -il. Hub. Siam ; 13r. Ingalls. An interesting posteriorly acuminated type, of a dark shining green colour. Species 127. (Mus. Cuujing.) Unio incrassatus. Un. iesid oblonffo-securiformi,cras- siuscidd, (jibbosd, antki decUvi-rotundatd, postice lafe g'M(jso-angidatd, area posticd decussatha corriigatd ; niyrlcante-brioined. The thickened Unio. Shell oblong wedge-shaped, rather thick, gibljous, anteriorly slopingly rounded, posteriorly broadly gibbously angled, posterior area decussately wrinkled; dark-brown. Lea, Trans. Amer. Phil. Soc. 1810; Obs. vol. iii. p. 55. pi. 16. f. 34. Hub. Georgia, North America. Of a peculiar broadly angled wedge-shape, tlie surface on the posterior area being cross-wrinkled. Species 12S. (Mus. Cuming.) Unio concestator. Un. tedd elliplico-omld, gibbo- siusculd, rude concentrice striatd, antice contrac*e ro- lundatd, postice sublate expansd ; fiiho-olivaced, viridi radio id. The elliptic Unio. Shell elliptically ovate, rather giljbous, rudely concentrically striated, anteriorly eontractedly rounded, posteriorly rather broadly e.\- panded ; fulvous-olive, rayed with gi'een. Lea, Pro. Acad. Nat. Sci. Phdad. 1857, p. 31; Obs. vol. vi. p. 67. pi. 12. f. 48. //ub. (jeorgia. North .\merica. Of rather simple character, manner on the interior side, whi rather broadly expanded. Species 12'J. (ilus. Cuming.) Unio obtusus. Un. testa oblongo-ovatd, subi'Hiptici!. gibbosd, Itevigatd, antice subquadrato-rotundafu, jhh- tice gibboso-declivi, obscure lirato-radiatu ; fuico- olivaced. The obtuse Unio. Shell oblong-ovate, slightly ellip- tic, gibbous, smooth, anteriorly somewhat scpiaL-ely rounded, posteriorly gibbously sloping, obscurely ridge-rayed ; fulvous-olive. Lea, Trans. Amer. Phil. Soc. 1840; (Jbs. vol. iii. p. ;5'J. pi. 11. f. 13. Hab. Georgia, North America. Partaking somewhat of the form of the preceding species, with the posterior side less expanded, gibbous, and obscurely rayeil with ridges. Species 130. (Mus. Cuming.) Unio bi-c.elatus. Uh. testd oblongo-ovatd, subcompressd, rude concentrice striatd, latere antico conspiciie com- presse rotundato, postico oblique declivi, umbonibus ni- tidissime radiatim et concentrice snlcatis ; Uvido-fidcd. otivaceo-tiridi postice radiatd. The doubly-carved Unio. Shell oblong-ovate, rather compressed, rudely concentrically striated, anterior side conspicuously compressly rounded, posteriorly obliquely sloping, umboes very neatly radiately and concentrically grooved; livid fulvous, posteriorly rayeil with olive-green. Hah. ? A very characteristic species, unlike any American type with wdiich I am acquainted, having the umboes very neatly decussately carved, somewhat after the manner of Custalia. Species 131. (Mus. Cuming.) Unio flavidens. Uu. testa trigono-securiformi, crassd, umbonibus prominulis, latere antico brevissimo, rotun- dulu, pos/icu trigono-acuminato ; nigricante-brunned. June, 18G5. UNIO.— Plate XXVI. The yellow-toothed Unio. Shell triangularly wedge- shaped, thick, with the umboes protnineiit, anterior side very short, rounded, posterior triangularly acu- niinntcd, very dark brown. Benson, :MS. in Mus. Cumin-. Hab. ]5engal. A solid wedge-shaped shell, very triangular in lorni, with the umboes rather prominent. Species 132. (Mus. Cuming.) U.Mo -Egyptiacus. Un. testa transversim ovata, teiiui- culd, concentrice rmli striatn, latere antiro compressi prodiicto, deinde rotundato, postico etiam compresae prodiicto, latiusculo, yihboso; fuho-oUvaced, nigricante- hrimneofiimatd. The Egyptian Unio. Shell transversely ovate, rather thin, concentrically rudely striated, anterior side compressly produced, then rounded, posterior side also compressly produced, rather broad, gibbous ; fulvous-olive, banded with dark-brown. Cah.liaid, Voy. a Meroe, vol. ii. pi. (U. f. Umo. Sliell ellipticiilly lieavt-shapeil, solid, luulioc-; ])n)niiiirui. .Ulterior siile very short, pcsterioi -loimmly (.!:-euivly imjjled ; black. Tmus. Aimr. I'lul. Soc. 183+ ; Obs. vol. ii. p. ]:j, pi. 5. f. 13. Ohio River, at C'iiiciuiiati, Nortli Aiiieriea. S|iecies (.M„s. (• oblii elliptic heart-sliape, black ext( Species IS-t. (Mus. Cuuiing.) Unio lexs. Vii. iesld transverse ocatu, snhtfquUalerali, hilerdiKS roliimlatis, snpenie compress!^ produclis, postico prope ninbones obtiise aiujnlato ; Hvido-oHvaccd, sericeii. The lens Unio. Shell transversely ovate, soniewhnt equilateral, sides rounded, compressly produced at the upper part, the posterior obtusely ungleil near the umboes; livid-olive, silky. Lea, Trans. Amer. I'liil. Soc. 1S30; Obs. vol. i. p. liO. pi. 8. f. 10. Hab. Ohio, North America. Rather more, than usually equilateral, the sides being compressly produced along the hinge margin. Spe( 13.5. (Mus. Cuming.) Lea, II ab. or to lie ) ciRCULUs. r«. testa elUptico-coj'datd, suhcirc'tlari, solidd, nmboiiibus coinpresse iumidis. lateribus brevibus, postico prope nudjoues obtuse anijidato ; fnsco-olivaced, iiigricante tiiictd. \ ORB Uxio. Shell elliptically heart-shaped, nearly [ circular, solid, umboes coiupressly swollen, sides J short, the posterior obtusely angled near the umboes ; j fuscous-olive, tinged with black. I Trans. Amer. I'hil. Soc. l^'l'J ; Obs. vol. i. p. 47. 1 )1. '.». f. U. Ohio ,111.1 Tciiiic^-ce, Xorlh America, (> KUBIGINOSUS. Un. ti-sid snhqmaJrafo-otiloiojd. ri(rifoniti, compressd, undionihiis corriiijutis, lali-n- tico rotiiiidato, postico aratdlo-triuiciilo, lli'.rnnsn- (jiilato ; riibii/iiioso-fidrd. UUDIJY Unio. Shell -iinirwli.'it siinnrelv iililo wedge-like, coinpr 'Sscd, ^ide round poster or arc angled ; ru Idy-fuh on-*. Le,\ Trans. Amer. I'h 1. Sue pi. *. f. lU I'liio Jlariis Conrai . Unio ceriiii «, ('our d. Hab Ohio, Xoi h .\1I1C ica. fulvo conipressec lis colour. wedge -like . wrinkle iiicK Species 137. (Mi ■K-) o SUBROTU.S'DI'S. I'n. testa otjioiigo-ovatd, valde in qiiilaterali, latere antico breoissiino, postico obliq producto, r/radatim atteniwto ; atrd. The NEARLY UOINK Ux inequilateral, anterior li(piely produced, grad Lka Trans. Amer. Thi'l. S pi. is. f. 4.). f'nio polit/is ', Say. Unio brevialis, Crouch Ilnb. Ohio, North America Tl e posterior siile of this attei uated. .. _ i;;--ovati short, mated : Obs. ircular form than /'. solidits but ncliued obliquely elliptical. June, Lea Hab 1865. Species 138. (JNlus. Ciiniing.) I'lLAKIs. Un. testa ob/ii/He cordatd, sotidissini nmbonibiis tiiuiidis, prominent djns, lateribns brecissiini jiostico obscure angidato, sidilrnncalo ; oliraceo-nii/r HAIRY Unio. Shell obliquely heart-shaped, vei solid, umboes swollen, prominent, sides very slior posterior obscuiely angled, slightly tniiiealcd ; olivi black. Trans. Amer. I'hil. Soc. 1S4U; OI,s. v„l. lil. p. -I Tennessee, North America. UNIO.— Pi.AiK XXVII. Tills species ule with a lu! Dstly covered (leriiiis. Species 139. (Mus. Cuming.) (I i!.\Di.4.Ti:s. (Til. lesid oblongd, siibcompressn, latere ' (inliro rotuuduto, postico oblique producto, sabobscure I nngulalo, dec/ivi-friiiica/o ; J'uho-oUvaced, intense viridi nmUiradiatd . j KAYED I'Md. Shell oblong, rather compres.sed, anterior side rounded, posterior side obliquely p duced, rather obscurely angled, slopingly truncatt fulvous-olive, many-rayed with dark gretii. Mija radiata, Gmelin, Syst. Nat. p. :iL'-'0. Uiiio radiata, Lamarck. My a elongata, Wood. Unio Virgiiiiana, Lea. Hub. Lake Georse, North America. A prettily-rayed species of scjuarely truncateil on the postt oblc '/ ** rnwFi.xxvm. Sowerby, del et \\\h YmcenlBrooks.Imp U N I 0. Plate XXV I II. Sptek-s 1-KJ. (Miis. Cuming. I Uxio Menkianus. Uii. tedd oblongn, coiiipressiiiscnht, umboiiibiis co7-n1 ; Obs. vol. viii. p. 72. pi. 39. f. 134. Hab. East Africa. A very distinct form of Unio, in which the surface is peculiarly crisply wrinkled throughout. Species 143. (Mus. Cuming.) I NIO SuMATRENSIs. Un. testd suhlrigono-oblongd, temd- ciild, undique tenue crispalo-corrugatd, latere antico attenuato-rotundato, postico declivi-truncato, gradatim latiore, obscure titmido-angulato ; fulveseente-olivaced. The Sumatra Unio. Shell somewhat triangularly ob- long, rather thin, finely crLsply wrinkled throughout, anterior side attenuately rounded, posterior slopingly truncated, gradually broader, obscurely tumidly an- gled ; fulvous-olive. Lea, Pro. Acad. Nat. Sci. 1859, p. l.^S; Obs, vol. v p. 57. pi. 34. f. 118. Hab. Sumatra. The scidpture of this species resembles that of the pr ceding in some measure, but it is nuicli less prouiinent developed. Species 143. (Mus. Cuming.) Unio apl.atUS. Un. testd ovato-oblongd, nwdice conre.rd. licvigatd, valde iiueq/iilalerali, latere antico atteiiiinto- rotundato, postico subtriincato-rotundatd ; piced. The flattened Unio. Shell ovately oblong, mode- rately convex, smooth, very inequilateral, anterior side attenuately-rounded, posteriorly slightly truu- cately-rounded ; pitch-black. SwAiNsoN, MS. in Mus. Cuming. Ilrib. Island of Chiloe, Chili; Cuming. A species of simple character, with somewhat of iho general external aspect of a (Slyvimcris. Species 144. (Mus. Cuming.) Unto nitens. Ua. testd elliptico-oblongd, medio siibcom- pressd, concentrice rude striatd, latere antico declin- rotmidato, postico arcuatim truncato-anguhdo ; fusro- oUvdced. The SHINING Unio. Shell elliptically oblong, slightly compressed in the middle, concentrically rudely stri- ated, anterior side slopingly rounded, posterior areu- ately truncately angled ; fuscous-olive. Lea, Trans. Amer." Pliil. Soc. 1840; Obs. vol. iii. p. 4:). pi. 13. f. 19. JIab. Tennessee, North America. Distinguished by an arcuate tlcxuous aiigulaticjn nf tlie upper posterior side. Species 145. (Mus. Cuming.) Unio MEllDlfiKlt. Un. ledd ovato-oblongd, gibboso-con- vexd, medio subcompressd, concentrice rude striata, ta- teribus rotundatis, postico obscure trnncato-angulatv ; piced. June, 1865. JNIU.— Plate XXVJII. liii; Jiui) Umo. Shell ovattly oblong, gibbously con- vex, faintly compressed in the middle, concentrically rudely striated, sides rounded, posterior obscnrclv truncately angled ; pitch-black. Watts, .lay's Cat. Shells, p. 2.5, no. lOii.V Hub. HungaiT. .\ rather swollen species, obseiirely-trinicatel\ angled on the posterior side, covered with a pitch-black epidermis. Species li(j. (ilus. Cuming.) L'xio GUBEi!NACULU.\i. i'n. testd late ^ccurifon prcmo-yhuui, rude coiictudrici niijutd i-i u6sciii-e ci-n'u- catd, lalere aiilico /jrecitaiiMO, (ilteHuato-rotuiidtito, puntivu pi'ra)}ipHti'y fjtjjunxo , lucide olicaceu-eiridi. Tin; Ki'DDKlt I.Md. Shrll broadly wedge-sha])e(l, coni- pressly llattened, rudely concentrically wrinkled and obscurely warted, anterior side very short, attennately rounded, posterior vc'ry largely expanded ; brigiit Hub. -f A Ibrm of / Hatlv cNpandecl the puaterio)- Fnw P/.XXIX. ^ f ■ta«-jii Brooi'.3 imp U N I Specie^ 14.7. (Mus. Cuiiiiiij;.) Uvio INOltN'ATUS. Uii. (eslii oblonyo-ovatu, siibiiuoicn- lari, leiiiii, ij'Moniiiscidd, latere uiifico coi/ipressi at- leniiato, Lreci, i-uliiuduto, poslico dectirH Jliwitunu-an- (julato, miperne coiicavo, rudialo ; fiih-o-ulivand, li- vido-viridi iincld. The unadouned Unio. SlicU oblong-ovate, somewhat boat-shaped, thin, rather gibbous, anterior side coin- pressly attenuated, short, rounded, posterior slopingly tlexuously angled, concaved and rayed at tiie upper part ; fulvous-olive, tinged with livid grceii. Hanley, MS. in ^lus. Cuming. Ilab. Cambojia; Mouliot. A distinct and very characteristic type, collected by the late M. Mouhot in Cambojia. Species 148. (Mus. Cuming.) Unio iris. Un. lestd subelungato-obloiigd, conipresslus- culd, conceiUrice striata, umbonibus corruyalis, latere aidico brevi, rotundato, posiico valde prodiido, obscure truncato-aiigidalo ; fuh-o-olkaced, ciridi radkld el fasciatd. The rainbow Unio. Shell rather elougately oblong, somewhat compressed, concentrically striated, ura- boes wrinkled, anterior side short, rounded, posterior much produced, obscurely truncately angled ; I'ulvous- olive, rayed and banded with green. Lea, Trans. Amer. Phil. Soc. 1829 ; Obs. vol. i. p. 53. pi. ll.f. 18. Unio nebuhms, Conrad. ilab. Ohio. A prettily-painted species, rather elongately produced I in the posterior side. Species 119. (Mus. Cuming-.j Unio uonTkadens. Un. testa elliptico-oblungd, Irevicjcdd, latere antico breoissimo, attenuato-rolitndato, postico amplilef Jtexuoso-angulato, declivi-truncato ; fnlvo- olivaceo, poslice idgricante'Viridi tinctd. The opposite-toothed Unio. Shell ellipticnlly oblong, smooth, anterior side very short, attenuately rounded, posterior largely tte.\uously angled, slopingly trun- green. Lea, Trans. Amer. Phil. Soc. I8:jlj; Obs. pi. 18. f. 58. Ilab. Eiver Mezherdeli, Tunis. A shell of )anaki Species 150. (Mus. Cuming.) L'NIO aUUatus. Uu.tesld urctiatim elongald, versus giuem oentraleni compressu, latere antico brevis rotundato, postico valde produclu, arcualim rulun vijc angulato ,• fnlvo-oliimced, rereo tinctd. The golden Unio. Shell arcuately elongated, pressed towards the ventral margin, anterior very short, rounded, posterior much produced, ately rounded, scarcely angled; fulvous-olive, ti with bronze. SffAiNsoN, MS. in Mus. Cuming. Unio depressus. Lesson. Unio C/iduensis, I'hilippi. Unio Gassiesii, Philippi. Hab. Island of Chiloc, Chili ; Cuming. 01 a ])eculiar goklen or rather bronze hue. Species 151. (Mus. Cuming.) Unio oBLIQUIKAdiatus. Un. testa ubtongo-ovutd, snb- obliqad, latere antico brevissimo, allenuato-ruti/itdn/;. postico latiote, delude nubattenuato-rotundalo, cix ten(n- side, ai 1 of a LttlmtuuiHs. Species 1." (Ml 1 FllAGlLIs. I'll, testa ohlongo-ooald, sjdiohliqnd, fi-)iiti, plano-com.pressd, dense mihii/e cuncentrici Jilo- s/i-irilfi, iimbunihiis consjAcue radiatim corrugato-lirutifi, liilerihiis rotitndatis, posiico multo mojore, laliore, obsi'iire obtuse autjidato ; sordide olicuceo-vireiife. I'RAGTLE Unio. Shell oblong-ovate, rather oblique, thin, flatly compressed, densely minutely concentri- cally thread-striated, umboes conspicuously radiately wrinkle-ridged, sides rounded, posterior much tlie larger and broader, obscurely obtusely angled ; dull olive-green. INSON, MS. in Mus. Cuming. , Island of Cliiloe, Chili ; Cuming. extremely charactc anv North America Stic type, dist :dl respects Species 156. (Mus. Cuming.) I) AllCKLANDlcus. Un. tesld oblongu-ovutd, teinii, compressd, coneentrlce dense filo-striuid, mnboidbm radiatim cornit/citu-lirtitis, taleribus rolnndatis, autico lirevissii/io, postico obscure coHvexo-angulalu : nif/ri- cniife-olivaced. Auckland Unio. Shell obloii'r-dvaie, tliin. com- pressed, coueeuti-i.-ally densrly tliread->lnated boes ra,lu,t,-ly wrinkie-rulged', .i,le. rounded, rior very short, p,„teri..r oh^curelv couvexlv ai blaekish-,,liv,.. (iuAv, :\ts. m Muv Km. //»/>. Auckland, Neu Zealand. spe :ubar type as t Species l.-,7. (Mus. Cuming.) I .Nil) C \i;iNTIIIAtii:itctl, anterior side short, attenuately rounded, posterior broader, somewhat expanded, L'lv ansiied, obs-eurelv raved ; itch. IM. - on any lullierto described. Species ICO, (M\i,k. ('uining.) Unio .EREUs. in. tnld sdiilrigono-obluKcid, Modiolifuinii, rude C0Hcetilric> slrtatu\ lulerc tmlicii brcrhsimu, al- teimato-rotiindatu, poxlico hil'c f.rpiuiso, jiru/ii' tiiiiboius conspicu). (jibboso-atiguliiio ,■ sordiili bruiiiicd, (rrvi) tincld. The brazen Lmo. shell somewlial triangularly ob- long, J/()(//«/«-.sliaped, rudely eouceutiiealiy stnated, anterior side very short, attenuately rounded, posterior l)roadly expanded, conspicuously gibbously angled near the uniboe.s ; dull brown, tinged with bronze. iiab. :- Another shaped like species UmvPlMJ/. Vincent Broolcs.linp- U M SpL-CR'S J (j 1 . rsio SPLENDIDUS. I'll, tenia rUijdial, iiijlatd, iiiliis Inced, auiice aiic/ustd, rotunda, postire laid, anijiilu margine dorsali elevato, epiderni'idi' lnleo,Jdu'iis vi dibits iiamerosls rndiuld, nuduiiiljus injlaiis, hcvibiis:. The splendid Unio. Shell elliptical, inflated, li within, narrow and rounded in front, wide and mv. lated at the back, with the dorsad niar-ia elcvati epidermis yellowish, radiated with given stripe^, ii boes inflated, smooth. Lea, Unio ii. p. 70. t. 19. f. 61. llab. Georgia. A remarkably inflated, coloured interior. shell, with splen.lid li: Species 162. Un 10 ORXATUS. Ull. testa .subcuilnlld. nlJtuUi. llllrii, lln„. iiioiqiiaii, radlis aiiffa.slis, iiitern.ptis, pinielaln ur- uald, aiilici bri'vi,siibrotinidd, postire loiiginsriild, ele- eald, valide aiigiilutd, post angidniti magniiiii Irifariam snbaiKjulato, iiitus pallide roseo-lutescente, margine veidrali postic'e inflaio, uiiibonibus inflatis snbri/gatis. The ornamented Unio. Shell rather wedge-shaped, inflated, yellowish, sometimes ornamented with nar- row, interrupted, sjjotted rays, short, rather rounded in front, longer at the back, elevated and strongly angulated, with three slight angles behind the large one, pale salmon-coloured within, ventral margin in- flated behind, nnibocs inflated, slightly rugose. ('oNRAD, Preshwater Shells. JIab. Alabama. a/ba'. e.rhis pallidi' olifarra', slrii/is vindibiis anpiislis nnliala, aiiiice breri, a„,/n.slald, pnstav nilde iiiltald, nblniiii' ainjiihihi. uianjnie posfiro dorsali sidjdrclifi, reiilrali rntuial.i. ari;i iinsliitujiihtri pared, iniiboiiibiis aaihdatii,, riujosis. The suiKiVATE Unio. Shell elliptical, inflatcil. thin, white within, pale-ulive without, radiated with nar- row green stripes, short and narrow in front, inflated and obliquely angulated at the back, posterior dorsal margin sloping, ventral roiuided, post-angular area small, umboes uiidulatrly nigc^c. Lea, Unio i. p. 12S. t. IS. t. Hi. llab. Ohio. Although an oval shell, in s<,im- degree resembling I'. spleadidi^s, it will be „ljserved tl.at this .licll is much lighter, the ])OSlerior dorsal margin is moi'e sioping, and the area behind the angle much smaller. .Mthougli named snljovaiiis, it is more oval than Cocalat. Species 163. 3UB0VATUS. Ull. tcsld elliplied, iiijlald, teniii. Unk Specie, KU. s. I'll. s,ib,-iiii,;tld. iiijlald. mill': riiseo-liitcs- mil,', r.rla.sa linirra, tniris el /asms riridihiis radiatd. latere aiitieo breri. pr,./inid'e rinjalu. latere pustiea lata, loiigiasealo, nigreseeiite, elecatiui iiiiijiilala, area postied triyoiid, aiuboaibiis siibriigalis. The ovate Ijnio. Shell rather wedge-shaped, salmon- aiid l.an.ls. Mutcnor side >hnil. divply ur(i.)ved. pos- terior side rather longer, luelimng tu hla,-L. uilh an elevated angle, posterior area trigonal, umboes slightly Say, I'hiry. .\ liter. llab. Ohio. r UnwPlllXJJ. VincenlBrOiilajTnp UN 10 Species 165. (Mils. Cuming,) Unio negatus. Un. lestd snhquailratd, irniisverise ml- catd, coiiipri'ssd, subaquilatL'rali, mtus alba vd snb- rosaced, aiitice hrevimrula, rotunda, poaflce aiKjulaid, pod angidnm plana, anlf nngidinii pitiiluhtui excti- vatd, niiibonibiis rityiilosis. The unacknowledged Unio. Shell suljunadratc, Iruns- versely siilcated, compressed, subequilateral white or slightly rose-tinted within, rather short, rounded in front, angulated at the back, flat behind the angle, slightly excavated in front of the angle, um- boes rugose. Lea, Unio viii. p. 80. pi. ix. f. '2e.j. Jlab. Big Prairie Creek, Alabama ; E. R. iShowalter. Co- lumbus ; Miss Spillmau. Dr. Lea states the ditt'erence between this species and his IL ruhigiiiosiis to be, that in the latter the wrinkles on the region of the uniboes are numei'ous and spread, while those of the former are confined to two or three on the posterior side. Species 10(i. (JIus. Cuming.) Unio henosus. Ua. tcsid iiijlald, subelongalo-ovall, siil- ciifd, iiitits roseo-piirptirascente, exlus fused, obscure radiatd, latere antico breci, rotimdo, medio subdepremlue »illl.iUt, side ra seurelv UXIO.— Plate XXXIV, nithei- poiiitfil al llie Icniiiiial uuirgiii, veiitrr much iiitiated. Lea, Uiiio vi. p. 73. pi. xiii. I'. .53. Hab. Othcalooga Creek, Gordon County, Georgia Elliot. Jishop Species 180. (Mus. Cuming.) Unio Baknesianus. Uii. nUonijo-mbq^Hadratd, cumpressa, kecigntd, inlim purpurmceiili;, axtm lutco-olivaced, la- ter/' aiitico bn'omiiiio, mbtruncatu, latere posticu elon- yato, oblique trnnmto, ob^ciiri amjidato, iiiargine (hjrsali declivi. i^ARNEs's Unio. Shell oblong-subijuadrate, compressed, smooth, purplish within, yellowish-olive without, ante- rior side short, subtruncate, posterior side elongated, obliquely truncated, obscurely aiigidated, dorsal mar- gin sloping. Lea, Unio li. p. 31. pi. x. i: Sfi. Hub. Cumberland River, Tennessee; Dr. Troost. A remarkably Hat little shell. Species ISl. (Mus. Cuming.) Unio REGULAlils. I'll, testa suheUiptkd, injlald, tenui, iiitii.i pitrpitred, extiis Imvigatd, obxcure olivr/ced, ra- diatd, latere antico (imjttUo, brevi, siibrotiiiulo, medio iiijlato, iiiarijine coiieexn, liilere postico elevofo, bia/i- i/nl/itii, inter (iiigiihs Iriuicnto, mitri/iiie pnstica diirtsnli et liUeruli dccliri. The regular Unio. Shell subelliplical, inflated, thin, purple within, smooth, dark-olive, radiated without, anterior side narrow, short, rather round, inilated in the centre, with the margin convex, posterior side elevated, biangular, truncated between the angles, posterior dorsal and lateral margin sloped. Lea, Unio iii. p. 81. pi. xxv. f. 59. Ilab. French Broad River, East Tennessee; Dr. Troost. UvK Fl XIW Yi«ei.lBvook:Jtrp UNIO. XXXV, Spi'cies 1S2. Umo MlCANs. Uii. ii'sid (iblungo-siihcUiplird, mIicoi,/- pi-rssK, lavujatd, nitenti', soUdii, intiis ru-ico-liiiesceii/r, extmfmcd, sparsim viridi radlatd, latere aiitico brevi, rotunda, latere podico elongalo, angiilaio, ido,versn.s umbones angutato. medio ad marginem leviler comlracto, lutere postico elongalo, tumido, snbtruncato. umbonibns niagnis, injlatis, l,r- vibus. Hyde's Unio. Shell oval, solid, inflated, white «ithni, yellow, ornamented with green, subdivided rays with- out, anterior side short, round, with an angle near the uuibocs, middle slightly contracted at the ventral UXIO.— Platk xxxvir. niiirgiu, posterior side lon^v tiimiJ. v; umboes large, inflated, sniootli. Lea, Unio ii. p. 14. pi. vi. f. 14. IM. Teche River. Louisiana ; \V. M. Sle A verv lull, riluniii sli.-ll, v.-rv beaulii Species 304. (Mus. Cuming.) Unio augenteus. Un. Icstdsubctineatd, perMiquu, rrassd, compressd, in/iis albd, exlus fusco-luleicei/te, jjosiice ra- diaiim nip'o-maciilatd, latere ant'tco brevissimo, tumido, siiblniiwnto, medio depresso, latere poMico angulnto, nd termiinnii acnminato, area podaiujalari cnKjtintd, de- rlici. The silvery Unio. Shell somewhat wedge-shaped, very oblique, thick, compressed, white inside, yellowish- brown outside, rayed at the back with black spots, anterior side very short, tumid, sliglitly truncate, middle depressed, posterior side angulated, acumi- nated at the end, post-angular area narrow, sloping. Lea, Unio iii. p. 80. pi. 23. f. 26. Hah. Holston Kiver, East Tennessee; Dr. Troost. Dr. Lea obsfrves that this species resembles U. ovi- fvniih, Conrad, but much darker colour. Species 205. (Mus. Cuming.) Unio dolabelloides. Un. te.itd brevi, nlbd, crasm, cuueald, iida.s albd, extus distniiler sulcata, fused, nigra radlatim macidatd, latere aiitico brevissimo, suhtrun- cato, tumidij, margitie ventraU rotundo, latere pontiro arcuatim biaiigulato, ante augidniii prim urn depresso, ad ierminiim acuminato, area postangularl anyustis- siiiid, declivi, itmbonibus magnis, tnmidis. The hatchet-shaped Unio. Shell short, elevated, thick, wedge-shaped, white within, distantly sulcated, brown, rayed with black spots, anterior side very short, rather truncated, tumid, ventral margin round, posterior side with two arched angles, depressed in front of the first angle, acuminated at the end, post- angular area very narrow, sloping, umboes large, sloping, tumid. Lea, Unio iii. p. 53. pi. xv. f 31. Ilab. Holston River, Tennessee ; S. N. Edgar. This shell is one of the cuneatc forms of the genus. It is marked with a single row of black spots on the tumid posterior ridge. Unu PI XXXVIII. U N I . Plate XXWllI. Species 20(1, (Mus. Cuming.) Unio Novi-Eboraci. Uu. testa ovuli, cni,ij>rr.sx,i. hilii-s alba, extusplamdatu, luted, virii/i in/rrni/i/m/ r,ii/iiifn\ latere antico brevi, rotmidu, latere iin.s/icn i-lnrnjatn, mili- atteniiato, obscure biangulato, ad tenn'uii:i,i trintcato, area postaiigidari aiigustii, declivi, niargnie eeiitrali vix medio contracto. The New York Unio. Shell oval, compressed, white within, flattened, yellow without, with intemiplcd green rays, anterior side short, round, posterior side elongated, ratlier narrowed, obscurely biangulated, truncated at the end, post - angular area narrow, sloping, ventral margin very slightly contracted in the middle. Lea, Unioii. p. 104. pi. xxiv. f. 114. Hab. Oak Orchard Creek, Orleans County, New York ; .1. C. Jay. This shell has an oblong, flattened surface, beautifully ornamented with interrupted green rays. Umboes inidated. Species 307. (Mus. Cuming.) Ukio Murchisonianus. Uh. iesld ovali-oblongd, s/dj- iiijlatd, iidiis alba, exlus obscure otlnaced, ad uiuhonnnt regionem vhtiqiie et iindidntiui ragiitil, ruij'ia medio et iufra ecaiiidi.K, jmflcr ohiiqii? Inhereithitd, latere anlico bred, rotiiudo, prope iiudiiniea sidiaiigidalii, latere por- tico oblongo, acioniiiato, angulato, po.it aiigahnu ob- scure bicostato. Murchison's Unio. Shell oval-oblong, rather inflated, white within, dull-olive without, at the region of the nmboes olilifpiely and undulately wrinkled, wrinkles evani'sciiit in llic iniiMlc and beneath, posteriorly obliipiely tnlioiculatrd, auleiior side short, round, with a slight angle near the niiiliocs, posterior side oblong, acuminated, anguhitcd, liL-hiiul the angle ob- sciu'ely double-ribbed. Lea, Trans. Anier. I'hil. Soe. vol. v. t. 3. f. (3. Hab. China. The wrinkles, very beautifully arranged, which cover a large portion of the surface at and near the tunboes, be- come faint towards the centre, and on the lower part of the shell. Species 208. (Mus. Cuming.) Unio exiguus. Un. testa obloiigd. obHijnd,a)igitsld,tniin, ■Habcompressd, i>itu.i creraleo-i ndescodi , e.vtas Irpvigatd, antice lated, postice viridi, nigro iddiqiie radiatd, latere aidico brevissimo, rotunda, latere po.itico eloiigato, ad lerannum subtruncato, viargine dorsali arcaato. mar- giiie venlrali rectiiiscalo. The narrow Unio. Shell oblong, oblique, narrow, thin, subcorapressed, blue-iridescent within, smooth with- out, yellovv in front, green behind, obliquely rayed with black, anterior side very short, round, posterior side elongated, subtruncated at the end, dorsal mar- gin arched, ventral margin rather straight. Lea, Unio iii. p. 29. pi. vii. f. ]. Hab. Chatahochee lliver, Georgia. A peculiarly-narrow, thin shell, light-coloured in front, dark at the back, and very obliquely rayed. Species 209. (Mus. Cuming.) Unio perovalis. Uit. lestd ovali, crassd, inflatd, iidus alljii, e.rtiis lerder snlcatd, olimceo-lidesceide, liueli piiuetatisi etfasciis iaterritptis virid/b/is radiatd, latere aidico bred, rotnndo, medio amplo, latere postico ob- longo, sabacmninato, obscure biaiigulato. The very oval Unio. Shell oval, thick, inflated, white within, lightly sulcated, yellowish-olive without, rayed with spotted lines and interrupted green bands, an- terior side short, round, middle full, posterior side oblong, rather acuminated, obscurely biangidated. Conrad, New Freshwater Shells, p. 43. t. i. f. 2. Hab. Biver Alabama. There is a peculiar punctured and interrupted appear- ance in the bands and lines which ornament this very oval sheU. Species 210. (Mus. Cuming.) Unio TroOSTENSIS. t'li. testa bredter ovali, tenui, in/hdd, iidns albd, ci-ta.s olicarrd. lalrrc nidico brcnnsculo, an- gusto, rotuuilu, „irdin a„i/,/,sini,n, lulerc pnslivo, lal'ius- culo, obtuse Iruuratn. uiargiue diirsuli rrrfu. po.Htice elevato, margiue veutrali rotuuJo, mabouibus iujtalis, tuberculatis. UNIU.— Plate XXXV III. Troost's Unio. Shell shortly oval, thin, iuHated, white within, olive without, anterior side rather short, nar- row, round, middle very full, posterior side ratlier broad, obtusely truncated, dorsal margin straight, elevated at the back, ventral margin roinid, umboes inflated, tuberculated. Lea, Trans. Amer. Phil. Soc. vol. v. t. 10. f. 30. U. traialk, Conrad. ffai. North America. So light and thin as to resemble an Aiiodoii, but although the hinge is very thin, it has lateral teeth. Species 311. (Mus. Cuming.) Unio Muulfeldianus. Uu. te.ild oUnuyd, subovali, coiiipreud, ii/tus olid et pallide earned, extns fusco- olivaced, nigra radiatd, coiicentrice sulcata, latere an- tico brevi, rotunda, medio complanata, margine v/'i/trali contracta, latere postico mhacuminata, area posterc- dormli obliqud, compressd, aiigmtd. :Mu!ilfei,d's Unio. Shell oblong, rather oval, compressed, white and pale flesh-coloured within, olive-brown without, rayed with black, concentrically grooved, anterior side short, round, middle Hat, ventral mar- gin contracted, posterior side subacuminated, postero- dorsal area oblique, con)pressed, narrow. Lea. Trans. Amer. Phil. Soc. vol. vi. i'. 6. p. 41. Hah. Tennessee. Species 210. (Mus. Cuming.) LI NIC OBEsus. IJii. tedfi obloiigd, rhmiboided, mbcom- pressa, teuui, intiin pallide ciipred, fxlns fiiaed, hexi- gatd, latere aiUico brevi, aublniiicato, latere postico oblongo, obscure biangidato, area pnstaiigulari hisid- calo, murgbie terminali oblique sublruncato, margine dorsalipaido elevalo,recliusr/ilo,wargine veiitrali recto. The obese Unio. Shell oblong, rhoinboidal, rather compressed, thin, pale copper-coloured within, brown, smooth without, anterior side short, subtnuicate, pos- terior side oblong, obscurely biangulated, post-angular area bisulcated, terminal margin obliquely subtrun- cated, dorsal margin slightly elevated, rather straight, ventral margin straight. Lea, Unio i. p. 106. pi. xiii. f. 2i). Hab. York River. VracRlim. ^^ ^ VincentBrooks,!inp U N I . Plate XXX [\. Species 313. (Mus. Cuming.) UniO ZICZAC. Uii. ledn ova/a, leevi, siibcomp rensd , inliis albido-siihcmriileu, exliis obscure olivacea, viridi ra- diiifd, radils amjnhdim strigatis, latere autico brevi. lata, rotimdo, luedio paiilo 'injhtio, latere postico ehm- rjato siibaiigidato, ob/i/ji'e tninrato, marffine dorsali declh-i. The zigzag Unio. Shell ovate, sinnotli, subcoinpressrd. hluish-white, obscurely olive witliout, rayed witli green, rays angularly striped, anterior side short, wide, round, middle a little inflated, posterior side elongate, with a slight angle, obliquely truncated, dorsal margin sloping. Lea, Unio, vol. i. p. :>i. t. 12. f. 19. Bab. South Carolina. The ligzag markings upon the il cause it to resemble U. duiinrif)iri,ii shell, and is not pointed or beake ttalte It i obliquely truncated. Species 214. (Mus. Cuming.) Unio donaciformis. Un. testa s/ibovali, snb'wjlatd. iii- tiis albd, exlus l/soigatd, luted, olivaceo radiald, radiis aiujidathm strigatis, latere autico rotundo, hreviusculo, medio inflaio, latere postico cuneiformi, siibrostrato, biaiigulato, marghie superiori perobliquo. The donaciform Unio. Shell suboval, somewhat in- flated, white within, smooth, yellowish and olive- rayed without, rays angularly striped, anterior side rounded, rather short, middle inflated, posterior side cuneiform, subrostrated, biangulated, upper margin very obli(pic. Lea, Unio, vol. i. ]>. 1). t. t. f. ?,. Hnb. Eiver Ohio. Marked with a pretty zigzag pattern, with the ijc)>lcrior side wedge-shaped, Species 315. (Mus. Cuming.) 1 xio GR.\CIL1S. Un. testa magna, irijlatu, tenia, subalnld, hevi(jU<\)\] the end truncated, postico-veiitral niaigin raised. Conrad, Sillinian's .Vmeriean Journal of Science. flab. River .\labama. .May, 18G0. UmcPl.IL. Yinceiiiilrnoksl St)W«rb5',del ctllli. UN 10. Species 21fi. (Mils. Ciuiiiiiu,-.) Unio Texasiaxus. Un. tesld glatidlpinni, rr/i\.sn. iiitiis nihil, fxliis iiiffrd, latere aiUico brcviss'inio, rutiiiiilu. iiieil'in suhiiijlnto, latere poslico eloiigalo, ciil lerniiiiiim mibtriiiicato, iiiarr/inc dormli jiaido arciialo. The Texas Unio. Shell gluiidifbrm, thick, white within, black without, anterior side very short, round, middle slis;htly inflated, posterior side elongate, slightly trun- cated at the end, dorsal margin a little arched. Lea, Unio viii. p. 41, pi. 61. f. 184. Hab. Devilt County, Texas; \V. Newcoinb, ]\I.l). Of an oblong, acorn shape, with a thick, dark epidermis. Species 219. (Mus. Cuming.) o GIBBER. Uii.tcild siihcrassd,oblonfid, subquadi laid, postice biangidatd, iiitinf mpr, brevmimo, suhroimido, wanjini latere posti latere , I'lilroli rectiu ,1 tri lato, ohh) . marr/iue dorsali eh-rntn. ; GIBBOUS Unio. Slii.-ll r.ifher thick, nblonii' posteriorly biangulated, cuppiT-colnuiril wi terior side wide, oblong, iriiiualril ;it the ci margin elevated. . I'nio ii. p. .•^.-.. t. 10. f. .-id. . Carrvfnrk Kiver, Tennessee ; Prof. Truust. Species 230. (Mus. Cuming. \ssrs. Vii. testa magna, oral/. 7, jiniide- '•om, tmtivld, hilm albd, inargaritared, exlm fnnro- 'ligresceide, concenlrice driato, latere aiitico brevi, yiiie rei/trali subii/flato, latere postiro oh- !■ bini/giilato, tnargiiie dorsali prnpe iirn- iiiii dcrliri, nmbonibus matptis roliuidls. o. Shell large, oval, thick, ponderous, tiiuiiil, white and pearly within, blackish-brown, and (■()iic(iitrie:illy striated without, anterior side short, round, ventral margin sli'j,htly inilatcd, posterior side oblong, obscurely biaiigiiliir, dois.il innrgin straight near the umboes, and then sloiiiu"-. rutiindn. mar luiigo, oh ^ri,r bones rei /;, I The THIfK :s\ S-iY, .\mcrie:in (.'onrholn Unio U,i,nH,;iln,mii, U„io -lliplirns, Bari i\fi/a ijravis. Wood. JIab. North America. Species 2-1. (Mus. Cuinii,^.) Unio lNri;cATUS. l^n. tcatd xnbiiiiadruld, ciirtd, laid, crassd, postice angiilatd, iiitiis albd, extiis nigra, prope nnibones angulathu rugald, latere anticu brevissimo, recto, latere postiro quadrato, post anguhnn obliqul' triiiinato, margiue dorsali elevalo, recti use iil it, ungiilo oblifpie elevalo. The dark-painted Unio. Shell subcpiadrate, short, wide, thick, posteriorly angular, white within, black without, angularly wrinkled near the nmboes, anterior side Miy slinrt. straight, posterior side square, ob- li(pi('ly tniiir.iliil behind the angle, dorsal margin elevated, ralliei' stiai;;lit, annle ol)liquely elevated. Conrad; Shells of New S.mtli \Val,'s. p. 45. tab. 1 S. f 4."). ILab. Georgia, .Xini'iica. (M« < tmiing.) Unio Indicus. Uh. testa oblique subtrigond, bred, alia, tnniidd, intus pallide roseo-liitescente, extiis olivaced, distanter subsitlcatd, prope iimbones angidalini rngntd, latere antico breri, declivi, margine ceidrali rotundo, hilrre jinslico ciiiii-ain, angidatn, iiinbonihiis prouiincii- libas. The Indian Unio. SIhU (,lili,|iuly siihtiigniial, short, elevated, tumid, pale saliiioii-tiiilrd williiii, olive, dis- tantly subsulcated without, angularly wrinkled near tiie uinboes, anterior side short, sloping, ventral mar- gin rounded, posterior side wedge-shaped, angular, undioes |n-oiiiiiient. Sower BY. Hab. India. A shell appear to I ikabh May, ISf UnuMMl X "VincentBroote-lTttp. UN 10 Species 223. (Mii^. Cuuiiug.) Unio FiBUl.oiDES. U/i. U's/d pf'iTii, x/ibro/iiii'/ii, crami, heoigalii, iiiliis alba, exiiis liitesrciitf, hili'rf aiitiro brevimmo, rectimculo, i,iargiiii' reiilruli rulmiilo, la- \ lere posllco obscure angntatu, manjutihus durscdi d latero-dorsali arcuatis. The button Unio. Shell small, rather round, thick, smooth, white within, yellowish without, anterior side very short, rather straight, ventral margin round- ed, posterior side obscurely angular, dorsal and latero- dorsal margins archetl. Lea, Unio vii. p. 37, pi. xxviii. f. 100. Hah. Counasuaga lliver, Georgia. Mr. Lea remarks of this interesting little species that it is more orbicular in Ibrm than either U. vnrli-opsia or U. Tnchelianus. Species 234.. (Fig. a, b, Mus. Cuming.) Unio Ntass^K. Un. testa oblique cutieatd, solidd, pa-slice oblique angulutd, inl'is alba, extus olivnrni, iiilnite, m/'dio et prope nmbtnies minute augitlalii:! nigahi, latere antico breoissiuio, margine vrulra/i anliir in- flato, poslice suhcoiicavo, latere postico ad terniinihii ncumiuato, m.argiiie dorsali bred, recto, margine dorxo- lalerali obliquo. The Nyassa Unio. Shell obliquely wedge-shaped, solid, posteriorly angular, white within, olive, shining with- out, with minute angular wrinkles in the middle and near the umboes, anterior side very short, ventral margin swelled in front, and slightly concave be- hind, posterior side acuminated at the end, dorsal nuu'gin short, straight, dorso-latcral margin oblitpie. SoWEUliV. Hab. Lake Nyassa. The several speciuicns of this shell in the cullectioii of the late Mr. Cuming differ from each other in form, the two specimens figured Ijcing both more oblique than one remaining unligurcd, and one of them being much more <'Xtensivc!v wrinkled than the other. crassd, iulus alba, margarilaci'd, extus rugosd, olivaceo- J'uscd, obscurl} radiatd, prope unibones uudulatim ru- gatd, latere antico brevi, subrolundo, tumido, margine ventrali aniice injlali), poslice exracatn, latere postico angnstalo, drprr.s.s,,. ad Ivruiiuin,, nbsruri triaiigidalo, margine dorsali deelivi. The Valentia Unio. Shell rather compressed, oblong, thick, white and pearly within, rough, olive-brown, obscurely rayed without, wavily wrinkled near the umboes, anterior side short, rather rounded, tumid, ventral margin inflated in front, excavated behind, posterior side narrow, depressed, obscurely triangular at the end, dorsal margin sloping. SOWEIIBY. Hah. Valentia, Spain. Several specimens of this species have been kindly r(nn- municated by A. Harrison, Esq. Species 230. (Mus. Cuming.) Unio Cafeer. Un. testa angustu,oblongd, tenui, injlatd, intus lutesceute, extus suhlavirjatd, sordide olivaced, latere antico breriusmln, siibnduudo, margine ventrali recto, vix medio cmttracto, latere postico oblongo, ob- scurissime hiangulalo, margine dorsali redo, margine latero-dorsali subarcuatim declici. The Caefeu Unio. Shell narrow, oblong, thin, inllatcrl, yellowish within, rather smooth, dull-olive without, anterior side rather short, rather rounil, ventral mar- gin straight, very slightly contracted in the middle, posterior side oblong, very obscurely biangidar, ilorsal margin straight, latero-dorsal margin rather archcil, sloph^g, Krauss, Smlaf. ^loll. p. 18. t. i. f. \\. ■ Hab. Natal. Species 225. (Mus. Harrison.) Unio Vai.entiaNUS. Un. testa subcompressd, ohlongd. Species 227. (Mus. Cuming.) Unio Bujisvensis. Un. testa eompressd, laid, solidd, reel,!, iulus albidd, extus litvigatd, luted, viridi ra- diatd, latere aulieo brevissinio, deelivi, margine ventrali paulii eourexo, latere postico oblongo, subquadrato, ob- May, IS 00. UNTO.— Plate XLI. liqiie angiilato, siii/riuwalo, wnrgiiie ihrsali suhdedivi, marr/ine latero-dorsali curio, ohliquo. IUghy's Unio. Shell compressed, wide, solid, straiglit, white within, smooth, yellowish, green-rayed without, anterior side very short, sloping, ventral margin a little concex, posterior side oblong, subquadrate, ob- liquely angular, subtruncated, dorsal margin slightly sloping, latero-dorsal margin short, oblique. Lea, Unio, vol. iii. p. 75. pi. 22. f. 51. Hub. Big Bigby Creek, Tennessee. In some degree resembling U. rubigiiwsus. Species 238. (Mus. Cuming.) Unio DOLOSUS. Un. (esld subovatd, inflaln, leiiui, iufits pnUide purpurea, extus sublavigatd, oUvaced, obscure radiatn, latere antico brevi, angmtatd, rotunda, mar- giiie ventrali medio conlraclo, postice inflate, latere postico hiflato, lalo, snblruncato, margine dorsali ele- vato, subalato, 7nargiue latpro-dorsali declivi. The sad Unio. Shell subovate, inflated, thin, pale purple within, smooth, olive, obscurely rayed without, anterior side short, narrow, rounded, posterior side inflated, wide, subtruncated, dorsal margin elevated, somewhat ivinged, latero-dorsal margin sloping. Lea, Unio, vol. \-iii. p. 79. pi. xi. f. 224. Ilnb. Alabama Eiver. IhuLPl.M//. »^i^ !L* ^ ^^> »» m Ti. Af«* Sowcrhv, ilelet hth. VinoentBroD)cs,linp UNIO. Plate XLII. Species 299. (Mus. Cuming.) Unio fluctigeu. Un. testa complanata, ohlongn, hitus siibc{Fruled, extus obscure olivaced, striata, pli.cis aiigu- latlm. cunvergentibtts et divergentiius riigatd, latere antico brevi, rotunda, margine venirali medio panto contracto, latere postico oblongo, ad terminum angiitis duobus truncolo, margine dorsali subarciiato, marijinf dorso-laturali declivi. The kippled Unio. Shell flat, oblong, bluish witliin, obscurely olive without, striated, and wrinkled with zigzag plaits, anterior side short, round, ventral mar- gin a little contracted in the middle, posterior side oblong, truncated with two angles at the end, dorsal margin slightly arched, dorso-lateral margin sloping. Lea, Unio, vol, vii. p. 68. pi. xxxix. f. 130. Hnb. ? .'Mthoiigh this species is published by Mr. Lea from Mr. Cuming's specimen as of unknown habitat, that author remarks that it appears to belong to South American types. He observes that it resembles his U. scobitiatns, lull is flatter, with a dift'erent style of plaits on the surface. Species 230. Unio cjikuleus. Un. testa subovatd, tenui, injlatd, pos- tice oblique biangulatd, i.ntiis ceeruled, extus leviter rugatd, oUvaceo-carulescente, prope umbones oblique rmjis dimricatis decussatd, latere antico brevi, ob- liqiio, margine ventrali stibinflato, postice versus tcrmi- 7ium elevato, latere postico oblique oblongo, subacuminato. The c«rulkous Unio. Shell subovate, thin, inflated, obscurely bianguiated posteriorly, blue within, lightly wrinkled, bluish-olive without, near the umboes decus- sated with diverging plaits, anterior side short, ob- lique, ventral margin rather inflated, posteriorly raised toH ards the end, posterior side obliquely oblong, sub- acuminate. Lea, Unio i. p. 105. t. 13. f. 25. Hab. River Hoogly, Hindostan. Species 231. (Mus. Cuming.) Unio Cambojensis. Un. testa ovatd, tenui, intus roseo. cteruleo el luteo tiuctd, extus undiihilim el angulalim crebre rugatd, latere antico subrotundo, brevi, margine ventrali subinjlato, latere postico oblongo, ad terminum biangulato, margine dorsali recto, margine dorso-late- rali valde declivi. The Camboja Unio. Shell ovate, thin, rose tinctured with blue and yellow within, closely wrinkled with angular and undulating plaits outside, anterior side rather round, short, the ventral margin slightly inflated, posterior side oblong, biangular at the end, dorsal margin straight, dorso-lateral margin very sloping. Sowekby. /fab. Camboja. A pretty little shell, wrinkled all over, which does not appear very similar to any species hitherto described. Species 232. Unio Swinhoei. Un. testa lata, oblongd, iujlatd, tenui, intus albido-carulescente, extus lavigatd, obscure oli- vaceo-nigricante, latere antico subrotundo, margine ventrali injlato, latere postico lata, margine dorsali elevato, margine dorso-lateral i recliusrulo, nmbonibus depressis. Swinhoe's Unio. Shell broad, oblong, inflateil, thin, bluish - white within, smooth without, obscurely blackish-olive, anterior side rather roundeii, ventral margin inflated, posterior side wide, dorsal margin elevated, dorso-lateral margin rather straight, um- boes depressed. Reeve, MS. Hab. Camboja ; Captain Swiidioe. Species 233. (Fig. a, Mus. Cuming.) Unio Camelopakdalis. Un. testa oblongd, lata, com- pressd, postice subangulald, oblique truucatd, intus alba, crassd, extus olivaceo-lutescente, maculis viridibus subquadratis, radiatim dispositis ornatd, latere antico brevi, snbangustd, margine ventrali rectiusculo, postice subinjlato, latere postico Into, oblongo, margine dorsali elevato, subarcualo, postice amjidalo, umiouibus //urcis, compressis. Mav, 1806. UNIO.— Plate XLU. The Camelopahd Unio. !?hell oblong, wide, com- pressed, ratlier angular at the back, obliquely trun- cated, white, thick within, yellowish -olive without, ornamented with green squarish spots disposed in rays, anterior side short, rather narrow, ventral mar- gin rather straight, inflated a little posteriorly, pos- terior side wide, oblong, dorsal margin elevated, slightly arched, with a posterior angle, umboes small, compressed. Lea, TJnio, vol. viii. p. 37. pi. lix. f. 180. Hah. North Alabama ; Prof. Tuomey. Although this species is painted something in the manner of U. pictim, it is a very different shell, being more com- pressed, solid, and quadrate. Species 233. (Fig. b.) Umo Lindsleyi. Vu. testa lievi, compresm, solkld, el- liptlcd, lata, postice biamjulatd, in/us alba, extus nlivacco-lntescente, niacuUs viiirlibm subqtiadratis ra- iVmthii dhpiisilit nriKild. hilcri' aiitico brevissimo, sub- iDKiiisliihi, Uiti'i-f /."s/irij iililtiiiijo. lata, prupe angidum Miiiiir i,irr, iiianjiiir dnrsilli rJi'l-illn, rrrliuxfliln, uiariinir hitrnili „blh,iw. i,i,di„ rniirnrn, Irriiiiiio siib- Iniiiriito, iniiljoiiibiis henbiix. sn/ih'r/in-.ssi.s. nml.ni.lal. Ih ntrirallv st rial at the end, umboes smooth, siib(h-pressrd. Lea, MS. Ilab. Strangways River, North Australia. Species 2S3. (Mus. Taylor.) UnIO CAMEI.Us. I'll. ti-\ld rravui, piiiidcroxd, xidirnii- foriiii. r/iidn;,iidr fiincd, iinxl'in- liiirix ii'iyris rrnlnild, 'hidnld, iiiHis albd. ,i„njiii,' rnrdninll iiiriunxalo. dni- lUlllx rrasxis; t.llrrr Ulllini brrri, tillllidn, iiianjillf itui-siili .sii/wnir r/rnilo, dr'nide drrliri, i.innjiii,' reii- trnli .s„i:s,i.,i nrrlin, i.irdio drpn's.o. iiianjni,' mitral, siiiiintii ; lali'rr pnsti,-u tiiiijiiliilo, altniiiiilo. nb a -wrlling protiil)erance above the uiiilioe.>. June, 1SG7. CnieR.m. Sowarijy.del.etlith. U N I Species 284. (Mus. Taylor.) Umo DECUEV.\TUS. Uii. Icxid aiihcylhitlracm, aliloiiya, cra.islmculd, I inn hid, rpidrnn iilr fiiarrj-ii iiji-rscciiti, . striata, ai uiiihuKes riihcxci'iiti Ifsnijutd iiidnld, i)ilii)s nlbd, dentil)iis Idiii'mat'ts ; tatcfp aiil'icD hn-cixshiio, m- tiindato, medio siibdc/jresso, maryine rrclo, nmliunihnx inididatis, imnidis ; latere pnstiro siihiiiiiidraln, .snlule- cnrratn, uliliiiite projw iiiarijini'iii dorsdh-m olisriiri: liiciiiKiliri'lnlo, uuiryiiii' dorsn/i /irope iih/lioiii's recto, tiiiii declici, termiiio anblruncato. The DECUiiVED Unio. Shell subcyliudrical, nbloiij;-, ratlier thick, tumid, covered with a blackish-bniwii striated epidermis, reddish and smooth near the uni- boes, white within, teeth laminar, anterior side vei-y short, rounded, middle subdepressed, with straight margin, and the umboes undvdated, tumid ; postr- lior side rather sqnare, slightly bent downwards, obliquely and obscm'ely bicanalieulated near the dor- sal margin, dorsal margin straight near the umboes, thence sloping, end subtruncated. ROSMASSLER. J[- (Jiistato, rotinidatii, ad iiiiinjiiiem dorsnhun etiiivnln : latere postiro vblii/nif s/ibii/ii/iilahi, /jroiliirtn, iiian/nii- diirxali rerfiifxci/lii, „ii.l.', "illi Ihirk teeth, covered outside with a bla.-k rpideiniis; an- June, 18G7 T'NIO.— Plate LVI. gill sloping upwards, middle undulated near the j Swainson. umboes, umboes depressed ; posterior side large, i Hub. River Ohio. expanded, obliquely biaugular, dorsal margin ele- tt • • .n- r r- ; / i „ •, c .. '.''•' o > t- xhis species diilers from I . nmpl anal tin by its lar "ated. winged, lateral margin sloping, end between , ■ , i » • i i i c " a 1 s' I rnorc triangular and posteriorly-produced lorni. the angles produced rnwM.mL !roolcs,Vmp U N I . Plate LVII. Species 388. (Mus. Tavlor.) Unio delodontus. Un. testa ovatd, crmsa, iiimichi, l(v- viyatd, coiicentrice dktaider rugutd, epldermide oli- vawo-fuscd indutd, intiis opacd, laded; latere podico elongato, lata, arcuatim angulato, area podancjulari angmtd, hiarg'me dornali vix declivi, ligamento luagiio, termino subacuminato, margiiie ventrali arjualUer con- vexo ; latere antico bred, margiiie dorsali antice siib- ciineatu, termino roliiiidu, iimboidbus lacibiis. The conspicuous-toothed Unio. Shell ovate, thick, tumid, sniooth, eoncentrically distantly wrinkled, covered witli an olive-bi'own epidermis, opake, white within ; posterior side elongated, wide, with an arched angle, postangular area naiTOw, dorsal margin scarcely sloping, with large ligament, end subacumi- nated, ventral margin equally convex ; anterior side short, with dorsal margin anteriorly subcuneate, end rounded, uraboes smooth. Lamakck, Anim. sans vert. Unio lacleoliix, Lea. [lab. La Plata. One of the most ponderous species, of oval form. Species 289. (Mus. Taylor.) Unio magnieicus. Un. testa compressd, teuuissiind, ova- td, laid, si/inphj/notd, lavi, viridi conceutrice fasci- aid, fasciiis viridibus, latis, subdivisis radiatd; latere jjostico oblongo, expanso, margine dorsali recto, sub- alato, margine laterali obliquo, termino truncate, mar- gine ventrali prope terminum valde sursuin acclivi, ■medio producto, antice siibcontracto, ad terminum an- iicum elemto ; latere antico angusto, superne divari- catim sulcato, margine dorsali recto, umhonibus coiii- pri'ssis, undulatim. rugosis, dentibus lateralibus ten/ii- lius, lamiuatis, dentibus cardinalibus nullis. Tub magnificent Unio. Shell compressed, very thin, ovate, wide, symphynote, smooth, concentrically banded with green, rayed with broad green subdi- vided bands ; posterior side oblong, expanded, dorsal margin straight, subalate, lateral margin oblique, end truncated, ventral margin much sloped upwards towards the end, produced in the middle, subcon- tracted in front, elevated at the anterior extremity ; anterior side narrow, divergently sulcated above, dor- sal margin straight, unil)oes compressed, undulately rugose, lateral teetli thin, laminar, cardinal teeth none. Lea, Obs. on Unio, vol. i. p. I.j5. pi. ."). f. Ik Hab. China. Notwithstanding the general appearance of this shell and the thinness of tlie lateral teeth, it may yet be classed witli otlier alate species in the genus Unirj. Species 390. (Mus. Taylor.) Unio FUNEBRALIS. Un. trsld rolnndo-snhtrigond, ralilr inirqnilaterali, cra-ssd (antice pracipue), epiderniidi- iiiijrd, striata, validd indutd, intus albo-subpurpnred, olimcen-nebulatd ; latere postico tumido, expanso, ra- didtim impresso, margine dorsali arcuatim elevato, area compressd cuneatd radiato, margine laterali ro- tn/tdo, margine ventrali medio recliusculo ; latere antico breBistimo, siiperni ennento. depresso, umbonibus subter- miniilibns hand jirominentibus, dentibus laternlibus elongalis, cardinalibus magnis laceratis. The mourning Unio. Shell rounded-subtrigonal, very inequilateral, thick (principally in front), covered with a black striated solid epidermis, purplish-white clouded with olive inside ; posterior side tumid, ex- panded, radiately impressed, dorsal margin elevated in an arch, rayed with a compressed cuneate area, lateral margin rounded, ventral margin rather straight in the middle; anterior side very short, cuneate above, depi'essed, umboes subterminal, not prominent, lateral teeth long, cardinal teeth large, jagged. Lea, Obs. on Unio, vol. x. p. 14. pi. 41. f. 2SG. Unio nociurnis, Lea. Hab. Uruguay, South America. The specimen bere figured is evidently older than either of those representing the two species in Lea's work ; it is in consequence less smoothly and evenly rounded. Be- tween Mr. Lea's two shells I do not think the diiferences of specific importance. Species 291. (Mus. Taylor.) Unio Tampicoensis. Un. testd snbfrapezoided, tumidd, crassd, lavigald, epidermide validd subpolild niyrd iuduld, intus violaced; latere postico sub/juadrato, September, IbO^ UNIO.— Plate LVII. profimde angiilafo, manjim; dormti pmilulum arcualo, (lerlim, margine lateridi obliquo, tcnnino suhcuneato, \ iiiiirifiiif vfiitruVi pins iiihinxve recto, umbonlbus ovalihm, \ linHiihiriil'ihi".. hevibi's ; latere antico brevi, angustn, mnriiiiie itnrsitli auieiilo, declivi, tennino rotnndo. The Tampico Unio. Shell subtrapezoidal, tiimid, thick, smooth, covered with a solid, rather smooth, black epidermis, violet within ; posterior side subquadratc, with a deep ansile, dorsal margin a little arched, slo- ping, lateral margin oblique, subeuneate at the end, ventral margin more or less straight, umboes oval, prominent, smooth ; anterior side short, naiTOw, with the dorsal margin cuneate, sloped, end rounded. Lea, Obs. on Unio, vol. ii. p. 34. pi. 7. f. IS. Unio Tecomatnim, Lea, vol. iii. ib. Ihih. Tampico and Tecomate, in Mexico. The latter of the two shells is a little shorter and less quadrate than the one figured, but this may be expected to vary in individuals. UnwPl.Lnil. S.:iwenb>'.del.e,tHth. U N I Species 293. (Mus. Taylor.) Unio subtrigonus. JJn. testa, compressu, soUdd, subtri- uiit/ulari, (data, lavi, peroldlijnd, olivaceo-fascd, iiit/is alljd, supra palUde saliiioned ; latere postico supra in alaia elevatam cuneatam expamo, infra ad terminmn. rotimdato, margiiie ventrali aqualiler conve.fo ; latere antico hrevissimo, margiue dorsali dertivi, lermhio ro- tiiudo, umljonibtts Itsvibus. The suBTiiiGONAL Unio. Shell compressed, solid, sub- triiiDgular, winged, smooth, very oblique, olive-brown, within white, with the upper part pale salmon ; pos- terior side expanded above into an elevated cuneatc wing, rounded beneath at the end, ventral margin equally convex ; anterior side very short, with dorsal margin sloped, end rounded, muboes smooth. SOWEKBY. Hub. Siara. A certain equal convexity of surface and rotundity of marginal terminations gives this shell a different appear- ancc from others of the winged group. Species 293. (Fig. a, h, Mus. Taylor.) Unio lutf.olus. Un. testa oblonyo-ovald, crassd, convexd, lavi, irreyvlariter concentrice rugatd, epidermide leiuii luted vet olivaced indutd, viridi sjiarsim radiatd ; la- tere postico prodiicto, oblique auffulato, ruargiiie dorsali recliusculo, marylite laterali obliijuo, termino acumi- i/alo, luargine ventrali utrinque sursum acclivi ; latere antico bremisculo, rotunda, umboidhus uudnlalini rii- r/atis, liffain.ento maximo. The yellowish Unio. Shelloblong-ovate, thick, curved, smooth, irregularly concentrically wrinkled, covered with a thiu yellowish or olive epidermis, rayed spa- ringly with green ; posterior side produced, obliquely nnguhn-, dorsal margin rather straight, lateral mar- gin oblique, end acuminated, ventral margin sloped upwards on both sides ; anterior side rather short, rounded, uniboes wrinkled in waves, ligament very large. Lamarck, Anim. sans vert. vol. v. Unio siliquiiides ?, Barnes. Unio injlatus ?, Barnes. Unio lienosus?, Conrad. The large specimen figured shows the normal form ni this species, which seems peculiarly subject to the varia- tion of a ventricose and stunted posterior margin, which occurs in many species, and in many cases indicates the female from the shell, as represented at Fig. G. Species 29-t. (Mus. Taylor.) Unio cariosus. Un. testd ovatd, subinfiatd, .wlidd, Icni, pdUiili stramined, fusco fasciatd, intus albd ; lali're piislii-o hilo, ohliqne ungnlaiu, sublritjono, maryine diirvili eU'i-ato, maryine laterali obliqiio, terniino acu- minata, maryine rentrali sursinn accVwi, medio con- vexo ; latere antico anyiisfo, uiiibonibns rotnndis, Ite- vibus. The decayed Unio. Shell ovate, subinflated, solid, smooth, pale straw, banded with brown, white withiu; posterior side wide, obliquely angular, subtriangular, dorsal margin elevated, lateral margin oblique, end acuminated, ventral margin sloped upwards, convex in the middle ; anterior side narrow, uudjoes round, smooth. Say, Enc. Am. Cat. t. 3. f. 3. Unio oe/iracenis ?, Say. I do not perceive any appreciable difference in the two above-named species as represented by specimens that have come under mv observation. September, 1867. Unio. Fl.LlX. Z(TMSlh^,^cX*ll\\\h Vmoa\l Bi-cdis , Imp . U N I Species 293. (Mus. Tnvlov.) I'Nio suPERBUS. Uii. testa suhijlohond, teiiiii, iiijlatd, ahitii, st ramhieil, jwstiee fasciis viriJi/jus rmHata, intus alhiilo-xnJjcanled ; latere pod'wo injlafo, expanse, 2'ro- fundi aiigulato, marrjine dorsali clevalo, sitljcompresso, c/dieato, maryine laterali cniiealo, tenuiiio ad anyu- liiiii acum'mato, niargiue reiitraU ad niujulmn sursmii acclim, ii\fm angnlalo ; latere aiitico anguatato, sul)- rugaio, murgine dorsali area coniplaiiatd iiiipresso, iermiiio acuunitato, snbqnculralo, margiiie ventrali huge siirsum acclivi, tmibonibm magnis, inflatis, sut/aiignlat/s. The superb Unio. Shell subglobose, thin, inflated, alatcd, straw-coloured, rayed posteriorly with green bauds, bluish-white within; posterior side inflated, expanded, with a deep augle, dorsal margin elevated, subcompressed, cuneate, lateral margin cuneate, end acuminated at the angle, ventral margin sloped up- wards at the angle, angiilar beneath ; anterior side narrow, rather wrinkled, dorsal margin impressed with a flat area, end acuminate, somewhat square, ventral margin sloped upwards for some length, um- boes large, inflated, subangnlar. Lea, Obs. on Unio, vol. iv. p. 32. pi. 42. f. 11. /lad. New Holland. Shorter, more inflated, and more globose than U. gra- iiidnld, mills pallulc J.ilc! iridrscenll ; latere post iro roliiiiJal'im iiiiijiilalo, jirudiiclo, iiiargine dorsali recto, inargiiie laterali obliijiio, teruiino subacumiiiato, mar- gme u trail vers elevalo, medk Species 290. (Mus. Taylor.) I Nio CoxGAR.EUS. Till, tesld sMrapezoided, coiiiplanatd, hemgatd, fused, obscure radiatd, iiitus cup red ; latere posiico subquadrato, biangulaio, angido antico elevato, margiiie dorsali rectiuscido, termino inter anguloa iruiicato ; latere antico aiigustato, termiiio rotundo, margiiie dorsali depresso, declivi, margiue vent rail recto, niiibonihus lavibus, angulafis. The Congakee Unio. Shell subtrapezoidal, flattened, smooth, brown, obscurely rayed, copper-coloured within ; posterior side squarish, biangular, front angle elevated, dorsal margin rather straight, end trun- cated between the angles ; anterior side narrow, end rounded, dorsal margin depressed, sloped, ventral margin straight, uraboes smooth, angular. Lea, Obs. on Unio, vol. i. p. 82. U. gibber, Lea? Caryferk river, Tennessee. Hab. Congaree river, Columbia. traclo ; latere antico brevi, aiigitsto, murgine dorsa/i sitbdeclivi, cnneato, wnbuuibiis Imibiis. The marginal LT^io. Shell oblong-ovate, thin, very smooth, somewhat inflated, covered with a blackish- brown shining epidermis, pale iridcsceut-fawn within ; posterior side roundly angular, produced, dorsal mar- gin straight, lateral margin oblique, end subaeumi- nated, ventral margin raised towards the end, very slightly contracted in the middle ; anterior side i- tico prnfiinde aiirjiilaio, ad angidtim tuberculis mayiiis riifinidix nrrimfo, post angidum. divaricatim undulafo el tnhrrrnhdo, iiiargine dorsali elongato, recto, margiiie JidiTidi aiihuhJlipio, termino aeniiiinato, margine veii- Species 301. (Mus. Taylor.) Unio .TaYENSIS. Un. testd suhlanceolatd, moderate coii- ve.vd, solidd, striata, oUvaccd, posticii nigreseente, intus et (id iiiidmtics olivaceo nebidatd ; latere postico pro- d/iclo, recto, biangulato, acuminato, margine dorsali recto, margine laterali oblijuo, termino triincnto, mar- gine vetdrali usque ad medium, recto ; latere antico breri, snbacnininato, margine ventraU sursuni acclici. .Tay's Unio. Shell sublaneeolate, moderately convex, solid, striated, olivaceous, blackening posteriorly, clouded with olive within and at the umboes ; poste- rior side produced, straiglit, biangular, acuminated, dorsal margin straight, lateral raargiu obliciue, end truncated, ventral margin straight at tlie middle ; anterior side short, subacuminated, ventral margin sloped upwards. Lea, Obs. on Unio, vol. ii. p. 38. pi. 3. f. 23. Unio ceqidlus?, Lea, vol. vi. Unio Maconensis?, ibid. Unio naviculoides ?, ibid. It is quite possible that distinctions may be jiointed out between the above species, but probably they arc not greater than those which constantly occur between inilivi- duals and varieties of the same race. rlerido, medio uaididu pan 'jntracto ; /,7//; „d Irrm liilrrr aidieo hrei-ixsiiiio, snhlrnncato, umlionihus pro- minentilms, nndainn tuberenHferis. The cylindrical Unio. Shell elongated, cylindrical, thick, heavy, smooth, very inequilateral, straw-co- loured, sprinkled with angular green spots ; posterior side deeply angular, armed at the angle with large round tubercles, divergently undulated and tubercu- lated behind the angle, dorsal margin elongated, straight, lateral margiu rather oblique, end acuiui- minated, ventral margin elevated at the end, slightly contracted in the middle; anterior side very short, subtriuicated, imihocs prominent, wavily tuberculi- ferous. Say, Enc. Amer. Species 303. (JIus. Taylor.) Unio rugosus. Un. testd viagnd, elVipticd, cras.ia, sub- cowpressd, stramined, viridi radiatd, lavigatd, intus alba et palUde salmoned ; latere jmslico producto, an- gidato, post angnlum divaricatim nigido, ante angulum oblique sulcato et tuherculalo, margine dorsali snbcon- ve.i'0, termino sulitruncalo, margine ventrali conve.vo ; latere antico snbacuminato, IcEvigato, nmbonihus parvis, acnminatis, nndnlatiin tubercnlatis. The rugose Unio. Shell large, elliptical, thick, sub- compressed, straw-coloured, rayed with green, smooth, white and pale salmon-tinted within ; posterior side produced, angidar, divergently wrinkled behind the angle, obliquely sulcated and tuberculated in front of the angle, dorsal margin a little convex, end sub- truncated, ventral margin convex ; anterior side sub- acuminated, smooth, umboes small, acuminated, uu- dulately tuberculated. Barnes, Silliman's Journal, vol. vi. t. 13. f. 21. Unio abducla, Say. Hab. North America. September, 1807. UmoPilXI. Sowerby, del et liUi Vmceut BroQliS.Imp . U N I 0. Pl.VTE LXI. Species 303. (Mus. Taylor.) Tnio coiMPBESsus. Uii. (cstii teuid, com/invw, hild, miljcinieata, Imvi^/atd, luted, fascm latis el iiltvris au- ffiisli.s viridilim radiafd, inlits laded, deulihiif: liitcrn- Htiii>i lamiiiiitk, iiiil/rin hn-oiliKx, //nx/icls eloiigalis, (li'iil'ilinx ciirdiiiaHliiis olillijiiis ,• lali'iv postico lalo, ^iihliuiiido, xiipni tilatn ■ lalerr iiiitiro aiigudo, hrcvi, iiiiiboiiibus niidulatim (nljercnliilis. The compressed Unio. Shell thin, compressed, broad, siibcuneate, smooth, yellowish, rayed with green bands, some broad and others narrow, white within, lateral teeth laminated, anterior short, postci'ior elongated, cardinal teeth oblique; posterior side broad, slightly tumid, winged above ; anterior side narrow, short, uraboes tnbereulated in waves. Le.\ on Unio, vol. i. pi. 20. f. 32. /fab. Ohio. The specimen from which our figure is taken corre- sponds with the original figure and description of Lea in every respect, including the very peculiar teeth and iim- boues. It is the only specimen I have seen that will so (•(irrespond, although the name is attached to shells in various collections. Species 304. (Mus. Sowerby.) U.Mo SECUUIS. Uh. testa crassd, compresm, obliqiw sitb- Inrjoud, liilcd,fascus maculiferis subviridibus radiald, iiiiHH lactc'd, dentilms crams; latere postico cunealo, mque ad marginem ventralem arcuatim drrlivi el on- (julaio, post angulum defleclo ; latere aiitico breris- shiio, nn/bombus aciitis, incurvis, margine reiitrali pon- tice acitmbiato, antice rotundo. The hatchet Unio. Shell thick, compressed, ob- liquely subtrigonal, yellow, rayed with greenish spotted bands, white within, teeth thick; posterior side euneate, sloped convexly to the ventral marn-in and angulated, turned down behind the angle ; an- terior side very short, uuiboes sharp, incurved, ven- tral margin posteriorly acuminated, rounded in front. Le.v on Unio, vol. i. p. 51. pi. II. f. 27. Unio depresMH, Rafinestpie. llab. liiver Ohio. This species is very distinct from all others. Species 305. (Mus. Sowerby.) Umio I'LENUS. Un. tesld crassd, alld, tmnidd, oblii/ne siib/ni/ui/d, castaned, lamgald, distanter couceidric'c J'd.sr'hild. el leviUr sidcald, intus salmoiied, margiiie vardiiKili el di'iit'ilms crassis ; hitere poxlico obliqui' aiignlato, post iiiiijiiluiii (iiigiislo, iiiargiiie dnrsull dr- cUe'i, lerm'uio Immtl't siibni-iii,iinalo, Htanj'nir i:enlral'i null- aiiijiiluui subex-cacato, medio tiimido, iniibouibns rtecalis, dislniilibiiii, incurvis ; latere ailtico brevissimii, niargiiie dorsali redo, cniiealo, niarglne laierali redo, viargine veiilrali surstim acdivi. The plump Unio. Shell thick, elevated, tumid, obliquely subtrigonal, chestnut-coloured, smooth, distantly con- centrically banded and slightly grooved, salmon- coloured within, cardinal margin and teeth thick ; posti'rior side obliquely angular, narrow behind the angle, dorsal margin sloped, basal end slightly aen- minated, ventral nuirgin subexcavated in front of the angle, middle tumid, umboes elevated, distant, curved inwards ; anterior side very short, with dor- sal margin straight, cinic-itc, lateral nuirgin straight, ventral margin sloped upwards. Le.\ Obs. on Unio, vol. i. p. II'J. pi. 10. f 39. ffab. Tennessee river. Diifering frc ventral margin, terminus. U. ph'/iiis in altitude from umboes to d in the more produced posterior basal Species 306. (Mus. Taylor.) Unio MDLTIKadiati'S. Un. lesld ucald, injlald, salidd, siibaiirahlid, fasrii.s riridibiis latinscitlis liiicalim di- dsi.\- radiald, inlus laded ; latere jioslico lato,valdein- flalii, i.iariiiiie dorsali elevalo, alaformi, redo, cunealo, aiarijuie feiitrali atujulaliui sursmii accliri ; latere an- lico rotundo, umbonlhas iiijlalis, heribus. The many-uayei) Unio. Shell ovate, inflated, solid, slightly orange, rayed with rather wide green bands, divided in lines, uiilk-uhilc uitliin; posterior side wide, nuieh inllaled, dorsal margin elevated, wing- shaped, straight, euneate, ventral margin angularly sloped iqiwards ; anterior side rounded, umboes in- iiated, smooth. Lea, Obs. on I'nio. vol. i. pi. 10. f 3. llab. Biver Ohio. ISGS. UNIO.— Plate LXI. The inflated and somewhat alate posterior side gives this shell a different aspeet lo that of TJnio rar/ialus, Lamk. Species 307. (Mus. Sowerby.) Unio AFFlNls. Uii. tesld taimi, ovatd, paUide oUvaced, laviyatd, obscure Jlavidd, lineis viridibm angmtis postice et antlce crebris, medio distantibus radiatd, intus salmoned et carulescenti, dc.ntibm cardmalibus rompresm et laceratis ; latere postico lata, obscure binngulato, super et post angulos coHceuirice rugalo, marghie dorsali elevato, area postaiigularl compressd, siihalatd, margine veutrali iiiflato, umbonibus perubli- qnis ; latere antlco brevi, angustalo. The related Unio. Shell thin, ovate, pale olive, smooth, (Itdl yellow, rayed with narrow green lines, which arc close before and behind, and distant in the middle, salmon and bluish within, with cardinal teeth compressed and jagged ; posterior side wide, obscurely biangidated, concentrically wrinkled upon and liehind the angles, dorsal margin elevated, post- angular area compressed, subalate, ventral margin in- flated, uniboes veiy oblique ; anterior side short, gra- dually narrowed. Lea, Obs. on Unio, vol. v. p. 27. pi. 19. f. 3(5. Hab. Alexandria, Louisiana ; l)r. Hall. produclo, oblique biangulalo, acuininato, subrostrato, margine ventrali ante a,ngulum concave, versus medium convexo ; latere antico brevi, supra obtuse cuneato. Vaughan's Unio. Shell elongated, rather thin, rather flat, olive, smooth, bluish-white within, cardinal teeth two and one, compressed, ragged, lateral teeth two and one; posterior side produced, obliquely biangular, acuminated, subrostrated, ventral margin concave in front of the angle, convex towards the middle ; an- terior side short, obtusely cuneate above. Lea, Obs. on Unio, vol. ii. p. 28. pi. S). f 23. linb. Sawney's Creek. Species 308. (Mus. Sowerby.) Unio Vaughanianus. Uu. testa clongatd, tenuiMsculd, sub- comphnrdd, olivaced, lavigata, intus albido-cceruled, deultbus r/irdi)iidibiiK dnnbus et nno, compressix, lacera- tis, lukralibuH diiobus H nno laininalis ; latere postico Species 309. (Mus. Taylor.) I'nio lineatus. Vn. tesld subcuneiformi, altd, injiatd, solidd, politd, riridi-flaveseenti, lineis distantibus, vi- ridi-nigrescenlilms radiatd, intus laded ; latere pos- tico elevatim angulato, lato, oblique subquadralo, miir- gi.ne ventruU wquaUter convexo, wnbonibus undulatis, proniinentibus ; latere autico hrevi, angustiore, ante nmbones excavalo. The lineated Unio. Shell subeuneiform, elevated, inflated, solid, polished, greenish-yellow, rayed with distant blackish-green lines, white within ; posterior side with an elevated angle, wide, obliquely sub- quadrate, ventral margin equally convex, with um- boes undidating, prominent ; anterior side short, ra- ther more narrow, excavated in front of the umboes. Lea, Obs. ou Unio, vol. iii. p. 44. pi. 13. f. 20. Hab. Chattahoochee river, Cohinibus, Georgia; Dr. Bovkiu. Jmc I'l.LXU. Sowerby.rleletlith U N I Species 310. (Mas. Sowerby.) Unio discus. Uh. testa oblongo-cimeatd, ponclerosd, con- ceutrice rwjatd, nigra, intm purpurea, marg'me car- diiiali crasso, detitibus posticis lam'math, anticis cras- smdmis, laceraiis ; latere postico oblique angiilaio, gra- datim angustato, margine dorsali decUvi, iermino truncato, medio inflato ; latere aiitico bret'issimo, mar- gine ventrali antice injlatu, postice ante angulim sub- excavalo, umbonibus tumidis proitiineutibus. The disk Unio. Shell oblong-cuneate, ponderous, con- ceuti-ically wrinkled, black, purple within, cardinal margin thick, posterior teeth laminatetl, anterior very thick, jagged ; posterior side obliquely angular, gradually narrowed, dorsal margin sloped, the end truncated, middle inflated ; anterior side very short, ventral margin anteriorly iuHated, posteriorly in front of the angle slightly excavated, umboes tumid, pro- minent. Lea, Obs. on Unio, vol. ii. p. 74. pi. 18. p. 57. Hub. India. Species 311. (Mus. Taylor.) r.xio siNUATUS. Uii. tedct elongatd, reniformi, arcmtd, rrannd, nigri'scenti, ad nmbones riifo-fuscatd, iiilus alba, dentibufi crassis, laceratis ; latere postico arcua- tiiii declivi, tumido, termino subrotundo, medio de- presso, ad margiiiem wntralmn hiante profundi si- niiato, unibonibus tumidis, prominentibus, lenuiter un- dulatis, margine ventrali et termino rotundatis. The sinuated Unio. Shell elongated, reniform, arched, thick, blackish, reddish-brown at the umboes, white witliin, teeth thick, lacerated ; posterior side sloped with a curve, tiuuid, subrotund at the end, middle depressed, gaping, deeply sinuated at the ventral margin, \nubocs tumid, prominent, finely undulated, ventral margin ami end rouiidetl. Lamahck, Anim. sans vert., Unio, sp. I. [/nio Roissyi? et Unio elongatwi, Michaud. Ilab. Rivers of Europe. It seems to me that this thick, arched shell diti'ers ma- terially from the compressed and differently-formed Vain iiiargaritiferus. The umboes are tumid and prominent, and undulated, while in the British species they are ilat, and scarcely produced beyond the dorsal outline. The an- terior side rounded and full, instead of being narrowed and compressed ; the sinus is deep, and the hiatus wide ; while the posterior terminus is rounded instead of being acuminated. Species 313. (]\Ius. Sowerby.) Unio ckassidens. Un. testa ovalo-subtrapezoided, jmu- derosd, prope medium subtuberculatd, rugosd, nigres- ceuti, intus albd, crassd, dentibus maguis, laceratis : latere postico arcuatim biangulalo, inter angulos trun- cato, margine dorsali declioi, ligameuto proiuineuti, clongato, nmbonibus subtcrminalibus, autici declioi . latere antico brevissimu, subrotundo. The tuick-toothed Unio. Shell ovate, tending to trapezoidal, ponderous, slightly tuberculated towards the middle, rugose, blackish, within white, thick, teeth large, jagged ; posterior side with two arched angles, truncated between the angles, dorsal margin sloped, ligament prominent, elongated, umboes sub- terminal, sloped in front ; anterior side very short , rather round. Lamarck, Anim. sans vert,, Unio, no. 3. Ilab. Ohio River, Mississippi. This species varies in form, some specimens being more oval, with the umboes more sloped down towards the short anterior. Januarv, ISfiS. VrucFI.L^ III ^ Sowerinr. del ct lith U N I Species 313. (Miw. S,,uii-l.y.l L'NIO SfOIUNA'lL-s. T'l,. tr^tii uniln-rijluiil nirm. inigiisia, dkurimth ruguhl, iiil»>> imUnn »//„/»y/,7/, ,ln,iihi,>i parvis ; latere poslirn jimihicfn, huirijhiihun ilursnli el hitemli arcuiifiiii (leelinhut, trn,iiiio iienmiiiuli), i.uir- (jhie venlrali rvct'iMciilo ; lulere imtieo hreci, siihro- tiDiilo, ambotdbiis pleiiia. The sculptueed Unio. Shell oviite-cvlimJricul, narrow, tumid, blaokish, wrinkled with tubercles and tiibercu- lateJ diverging ribs, within pale-snlinon, with small teeth ; posterior side produced, dorsal and lateral mar- tcius sloped in a curve, end acuminated, ventral margin ratlier straii^ht ; anterior side short, rather rounded, l.KA, (Jl)s. on Uiiiii II„h. ^iani. I. 13. Species 31-I-. (Mus. Sowerby.) I'nio oiilENS. Uil. lestd elonijatn, suhoviitii, tenni, mih- roiiipresM, pailldi' virkll, ohlique (iiitire el mei/io fiHciis (jldiqiii^ et piist n,i,j,iln„i J)iM-},i hit,i, niiliuhi, iiitwi alhida, tlenliljus tniiiiljiis ; lulrre po>^tii-o oljln/ne uiiijnlnto, margiue dormli hrevi, redo, nwri/ine lateral i obliqiio, termino acmiiinato, maryiiw veiitruli bijluli) ; latere aiitico mhproducto, itiarylne dorsnli recto, cii- iieato, imboidl/iin teniiiter llrato-undaths. Thk kising sun Unio. Shell elongated, subovate, tliin, subcompressed. pale green, rayed witli obli()ue bands in the front and n-iitiv, :iii,l ,me bn.ad WVm<.\ \\\r angle, white uillim, teeth thin; posterior side ol)- iitpiely angular, dorsal margin short, straight, lateral margin oblique, end acuminated, ventral margin in- flated ; anterior side somewhat produced, dorsal mar- gin straight, cuueate. umbues tiurlv uudidatilv rhlged. Le.\, Obs. on Unio, vol. i. p. S.'i. pi. (!. t'. 1. Ilah. lliver Ohio. The tine linear character of the undulations on the uni- boes, and the elongated, depressed form, distinguish this shell sufficiently from I'ldo pielontiii. Species 315. i.Mus. llanley.) Unio PrEVOSTI.AXUS. I'n. tenlii vompresm, Huhoratd. olivficed, fasciU viridllmx irreijiil(ird)iis iiilerriiptis niitire teniiibiis poatici liilioribiia nnliiild, inlits e,erii- led, deidibua aiiticls tenidbiis, ponticis iinllix : liiU-re pontirii lalo, e.vpauso, obloiii/o, mari/iiie dorsah siiii- arciiato, lerm'mo mdjrotmido, iiianjhie ceiilrali iiiflato. uiedio (UHjiistato, iiiiiboidbiis roiripreasis, ciipreis, Ireci- i/ath ; latere antico aiigudato, brecimcnlo, rotiuidu. I'revost's Unio. Shell compressed, subovate, olive, rayed with green, irregular, interrupted bauds, which are auteriorly thin, posteriorly wide, inside blue, with thin anterior and no posterior teeth ; posterior side broad, expandeil, oblong, dorsal margin slightly arched, end rather round, ventral margin inflated, middle narrow, uiiibors copper-coloured, smooth ; anterior side narrow, rather shm-t, round. Lea, Obs. on Unio, vol. v. p. ;2.J. pi. I'.i. f. 31. Uab. Entowah river, Georgia. Species 31 G. (Mus. Sowerby.) UXIO PICTIS. I'll, teiild redd, diUuujn-eUi piled, solldd, liihiidd, hvdijald, uiiliir. cniirnilnn) rei/ald, ob.ieiui' Htramiued, radiis ijblii/id.i luterniptis pktd, iiitiis aii- iice crassd, nlbd, postice tenni iridescei/ti, deittibii>! .iolidii ; latere poslieo eluiit/ato, termino aciiiiiiiinto, margiue ventrali cequaliter couoexo, umbonihits Ueri- biis, Iiaud proiidiientibiis ; latere antico rotundato. The i'aisted Unio. Shell straight, oblong-elliptical, solid, tumid, smooth, concentrically wrinkled in front, dull straw-colour, painted with oblique inter- rupted rays, inside tliick in front, white, thin iri- descent posteriorly, teeth solid; posterior sicli- lengthened, end acuminated, ventral margin equally convex, umboes smooth, uot prominent; anterior side rounded. Lea, Obs. MH Unin. vol. i. p. ISo. pi. 11. f. 32. IM. ILirprth ruvr, Tmiiessce. Species 317. (:\Lis. Taylor.) UxiO OCUHAfErs. I'n. Ie,ld omtd. leiini, liijlatd. he, .lauuarv, ISGS. rXIO.— Plate ]A1I[. fl'iln, piiUkli ochracau, posiici Uueis rinililiux j, to bear so close 1 cannot venture to ■>pei 31 i Um 1 ('VI{KEV.\N.\. I'l siibro.mi „iil sal„„u nn/iix ulicic 'inter lobas (Mns. .Sowerby.) /I'std pored, noUdd, obloiiffd. npn a, riijireiilrke teiiiiiU'r ruijntd, iiiiKjiiis oblique midutd, postice liilere postico obtongo, hllohato, \iiiirgine dorsati dectivi, medio coi.vi'.iv, teriiiiiio uciimiiinto, tobd nnLicd rotimdn, margine rentrnli ante lobain rontravtu ; latere antico snbprodiicto, rnaryine dorsati dectivi. Cuukey's Uxio. Shell small, solid, oblong, ro.seate or snlmon-tnited. coueentrieally finely wrinkled, ob- liquely nndidated near the umboes with large wrinkles, painted jiosteriorly with olive rays; pos- terior side oblong, bilobed. dorsal margin sloped, convex in the middle, acnuiinated at the end ; an- terior lobe rounded, ventral margin eoiitraeted in front of the lobe; anterior ^ide lather produced. dr)r- sal margin sloped. Lea, Obs. on Unio, vol. iii. p. Gl. pi, IS. f. 40. Hab. Stone's River, Tennessee; l)r. C'urrev of Nashville. UnwPLLl IV. Sowerljy. del.et liOi Vincent, Brool(s,Imp U N I 0. Species 320. (Mu>. Soweiby.) I'll, h'sfil parvd, ovalii, siilidd, pnllide AltATUS iilirnci'n, concent rice Icnni-Hriitii, /, politico proilucto, arcniitiiii iinijuliili cOHVCro, le7-mino cenlnili. ncnminiilii ■ latere llnrscli rrnlnili siir.snm accVm ; latere antico Ijrwi, prope mnri/ineni hniyalo, umhonihus parvis, hand proiiiinentiliHs. The ploughed Unio. Shell small, oval, solid, pale olive, concentrically finely ribbed, white within ; jiosterior side produced, with a curved ansjle, dorsal margin convex, end central, acuminated, ventral mar- . gin sloped upwards; anterior side short, smooth near the margin, iimboes small, not prominent. Lea. Obs. on Unio, vol. iv. pi. 42. f. 12. .//„/,. •;- species 331. (Mus. Sov Unio sibglobosus. Vn. testa solid a, ocato-sidjrulnndd, Hidilavigald, tnmidd, epidermide nigrescenti indutd, intns salmoned, margine cardinati arcnato, dentiljiis laceratis; latere postico prodiicto, angnlato, margine diiiwali drcliri conre.ro, terinino tirisali acuminatu, hiiirijine rentrali ante angnliim contracfo, turn con- re.ru ; latere antico breoi, rotnndo, nmljonibiis iiiiiiidis, hand prominentibns. riiE SUBGLODOSE Unio. Shell solid, ovato-subrotuud, rather smooth, tumid, covered with a blackish epi- dermis, salmon-tinted within, hinge margin archi'd, teeth jagged; posterior side produced, angular, dor- jal margin sloped, convex, basal end acuminated, ventral margin contracted in front of the angle, then convex; anterior side short, round, und)oes tumid, not prominent. Lea, Obs. on Unio, vol. i. p. 142. pi. 2. f. 3. Bayon Teche, Louisiana. Hah. This species is one of the most subglobose in form. Species 322. (Mus. Sowerby.) NIO TRIGONUS. Un. testa subcompressa, subtrigona, crnssa, siibltevigatd, fmco-olivaced, iiitvs albH, dentibns maijnis laceratis, nmbonibus nndatis, prominentibns ; latere postico siibqiiadrato, anguluto, margine dorsnli et lafcrali declivibus, terinino basali snbtruncato, area postangidari drpresw, margine centrali ante inignlnm siiliconlracto. medio siibdeprrsso ,■ latere antico breri. ileclivi. ■ . The trigonal Unio. Shell subeomprcssed. subtrign- nal. thick. .ralher smooth, olive-brown, white within, w ith large jngged teeth, iimbocs undulated, promi- nent ; posterior side subquadrate, angulaj-, dorsal and lateral margins sloped, basal end subtruncated, post- ang\dar area depvessed, ventral margin contracted in front of the angle, middle siibdepressed ; anterior side short, sloped. Lea, Obs. on Unio, vol. i. p. 120. pi. 10. L 40. Hab. Oiiio rivrr. at Cincinnati, and Louisville. Species 323. (Mus. Sowerljy.) Unio pykamidatus. Un. testa oblitjid pgramidatd, Irevi- gatd. solidd, fn-ico-nigrescenti, intns .lalmoned, antice crassd, postice tenni el iridescenti, margine cardinati lato, crasm, dentibiis nuKjnis ; latere postirii iihliqne prodiicio, rotiindatiin angiilalo, ante ungnlnni depresso. terinino basali aciiminnto, inargiin' reiilrali versus Irr- liiininn snbcoiit racto, medio tnmiilo. nmbonibus jicr- elei-atis acuminatis, terminalibns : latere antico un- rissiino, margine dorsali ante iimbiinex ciineulu. The I'Ykamidal Unto. Shell obliquely pynimiilMl, smooth, solid, bhiekish-brown, salmon-tinted within, thick in front, thin and iridescent behind, cardinal margin wide, thick, teeth large; posterior side ob- liquely produced, roundly angidar, depressed in front of the angle, basal termination acuminated, ventral margin subcontracted near the end, middle tumid, umboes much elevated, acuminated, terminnl : ante- ri(n- side very shcn't, dorsal margin euiieate in fmni of the umboes. Lea, Obs. on Inio, vol. i. p. IIU. pi. IG. f 3!). Ilab. River Ohio. IMore elevated and oblique than Unio picnns. Species 324. (Mns. Taylor.) o RUSTICUS. Uit. testa ova la, subcglindraceft, partim viridi, snpernc et ad latera divaricatim granijern, in- tns rlvidi^ cnpred, dentibns crassis, laceratis ; latere pos. 3 oblongii. obscn lulerali oblinnn ? bianyulato, margine dorsali lerminali inter anqnios Irnn- ■NIC).— r LXIV. ciito, margiiie renlrali. rectuaculu : latere niiticu breoi, decUvi. TllK Rusxrc I'NIO. Shell ovate, Mibcyliiulnral, gnrti in parts, abovi: and at the sides diverge\itly granulated. brif^ht copper-coloured witliiii, with thick, jasged teeth; posterior side oblong, obscurely biangidar, dorsal margin straight, lateral oblique, terminal be- tween the angles truncated, ventral margin rather straight; anterior side short, sloped. Lea, Obs. on Unio, vol. vi. p. 14. pi. 25. f. 7. Unio tumidiilus. llab. Siam, Lea. The ]\Iexican species, Unio pticij'cnis, which Morelet has named U. crocodUonmi, is nuieli more ovate and acu- minate than this. Unio titmkhdus of Lea I take tn be the young of our species, as siiuwn in a specimen m the collection ol'T. L. Taylor, Esq. Species 32.5. (Mils. Sowerby.) ;i() JIARGARITIFERUS. Ull. lesld ohloiKJO-OVlltd, ('O)ll- pressd, isul/urcuatd,fusco-Hiijrescenti, iiitiin iilhidd, doi- iihm anticis haud promiuentibiis, dentihiis post ids nullis; latere poslico arcaato, ohliqiteprope wargiiiew dorsahiii. depresso, marijine dorsali convexo, laterali decliri, ter- miiio acHminato, margine veiitraH ad lerminiiM siirmm acclici, medio depresso snhcontracto, niiitjoiidias ciipreis, haud proiiiiiientibm ; latere inilico xidiprodiirlo, siib- ijuadrato. Tnii rE.utL-BK.UtlNG Tnio. Shell obloug-ovatr, com- pressed, ratiier arched, blackish-brown, whitish within, anterior teeth not prominent, posterior teeth none ; posterior side arched, obliquely depressed near the dorsal margin, dorsal margin convex, lateral margin sloped, end acuminated, ventral margin sloped upwards at the end, middle depressed, sub- contracted, umboes copper-coloured, not prominent ; anterior side somewhat produced, subquadrate. DliAfAN.iNU, Moll. Ter. Fluv. p. 132. t. 10. f. 17^19. I believe this shell to be quite atiis of Lamarck, which has pron lateral teeih. umboes and thick Species 321). (.Mus. Sowerby.) o VENUSTUS. I'll, testa oriitd, mlidd, coiiiprcssd, la- vigatd, Jlavldd, fusciis talis viridibics radlatd, iutus al/id ; latere postico aiigulalo, wargiiie dorsali redo, margine laterali (ililiiiiio. termian tmsnli aeiniiiiiato, margine renlrali eoiirexiiiscnlo, ni,iljijnibii.s aeirr,iin(iti\ ; latere postico snbrotnnda. i BEAUTIFUL Unio. Shell ovatc, solid, compressed, smooth, yellow, rayed with broad green bands, white within ; posterior side angular, dorsal margin straight, lateral margin oblique, basal terminus acu- minated, ventral margin rather convex, umboes acu- minated ; posterior side rather rounded. 1, Obs. on Unio, p. 4. pi. 11. f. 4. '). I'otosi, Missoiu'i ; Cincinnati, river Ohio. rnirPl.LXV. Sowerby, dd etlith Vincent. Brooks. Imp U N I Species 337. (Mus. Sowerby.) Unio subangulatus. Uu. ovalo-iubciiiicifurmi, lenni, Imviyalu, stramined, podice fasciis at. Imeis viridifji/n radiatn, inlus pallidh Halwoned ; latere postico ob- tusi angulalo, maryimi donali eli'Mto, snbalnio, um- bonibi(>i acutls, litvibiis ; latere aiitico bred, aiigustato, rotunda, dentibus aiiticis parvis, poxticis temiibiis, lii- minatk. The subangular Unio. Shell ovrtte-subcuiieifonn, tliiii, smooth, straw-coloured, rayed posteriorly with green bands and lines, pale salmon within ; posterior side obtusely angular, dorsal margin elevated, subalate, umboes acute, smooth; anterior side short, narrow, round, anterior teeth small, posterior thin, laminar. Lea, Obs. on Unio, vol. iii. p. 47. pi. 13. f. 23. trfcir/ntii. iiitiia siibaiirauti, i/eti,(/eiitibiis par Hub. Chattahooe Cohmibn^ Georgi; Species 338. (Mns. llauley.) Unio spatulatus. Uu. testa oblongo-subovatd, com- preand, liBcigatd, Jlavido-ritfenceuti, fasciis et liueis oiridihus medio rudiatd, intils albidd ; latere postico producto, prope margiiiem dorsatem oblique depressn, margiiie dursali arcuato, prope lerminum excavato, ter- iiiiiw uciiiiiiiiatiiii rolundo, margine veidrali ad ter- iiiiiiniH sarsiim acclivi, medio rectiusculo, vmbonibus tuberculis widatia armatis ; latere antico rotunda, margine dorsali declim. The spatolate Unio. Shell oblong-subovate, com- pressed, smooth, reddish-yellow, rayed in the middle with green bands and lines, white within ; posterior side produced, obliquely depressed near the dorsal margin, dorsal margin arched, e.x.cavated near the end, end aeuminately rounded, ventral margin sloped upwards at the end, middle rather straight, umboes armed with waved tubercles; anterior side round, dorsal margin sloped. Lea, 01)s. on Unio, vol. iv. p. 51. t. f. 33. Hub. Ruck river, Wisconsin. Species 339. (Mus. Sowerby.) iEGLECTUS. JJn. testa tenui subinflald, ovato-sub- ■teiformi, luteold, antice concent rice rugatd, postice lateral ibnx Irnuibiis ; latere postico lata, obtusi: angu- lalo, tuinida, snbiiiHidratii ; latere antico angusto, sab- depresso, margiue dorsali ilcclici, tenninu subai-uini- uato. The neglected Unio. Siiell thin, subintlated, ovate- siibcuneiforni, didl yellowish, couceutrically wrinkled in front, smooth behind, slightly oiange and bluish within, teeth small, the lateral ones thin; posterior side wide, obtusely angular, tumid, subquadrate ; an- terior side narrow, subdepressed, dorsal margin sloped, end subacnminated. Lea, Obs. on Unio, vol. iv. p. 38. pi. 43. f. 10. Uab. North Alabama. Species 330. (.Mus. Taylor.) Unio tortuosus. Uu. tesld coiupressd, laid, solidd, tra- pfzoided, slriis et rugis sublavigatis depressd, iutits purpured, epidermide fasco-subviridi, obscure radiatd, valralis ad iiiaryinem ventralei/i tortuis ; latere postico oblique angulalo, aiigulo tumido, obtuso, a red post a n- (jnlari costis duabus suhevanidis radiatd, margiue dor- sali rectiusculo, laterali obliquo, tenuino basali sub- acuminato, mnbonibus parvis, margine veutrali medio subcantracto ; latere antico superne oblique cunealo. The tortuous Unio. Shell compressed, broad, solid, trapezoidal, impressed with rather smooth strire and wrinkles, inside purple, epidermis greenish-brown, obscurely rayed, valves tortuous at the ventral margin ; posterior side obliquely angular, angle tumid, obtuse, postangular area rayed with two almost obsolete ribs, dorsal margin rather straight, lateral margin oblique, basal termination subacuniinated, umboes small, ven- tral margin slightly contracted in the middle ; ante- rior side obliquely cuneate above. Sowerby. Hab. Maryland. The fine shell here described differs from T. purpureu\ (U. complauatus. Say) in its greater breadth and its tra- pezoidal form. The unsymnietrical curve in the ventral margin may possibly be accidental. January, 1SG8'. IJA- 10.— Plate LXV. Species 331. (Mus. Taylor.) Umi) TRIUOSTIUS. Un. testa obloiigo-siihordtn, suLioUJii, Immdd, angustd, lavi(jala, iiitus aWn ; hdrre /jostico prodiwto, obscure biaugulato, margine dorsali recto, | lalmili perolliqito, termino inter angulos truiwatu, < margine venlrali ad terminum aursuiii acrlivi, post me- diiii.i Infiatd, medio vix confracto, iimhoiiihus siibpro- ! M'nieiitibiis, coslellis graniferis, nngularUi-r dicergenli- | hns riigata ; latere anlico subrotiuido. The trirostral Unio. Shell obloiig-subovate, raUicr solid, tumid, narrow, smooth, white within; posterior -side ])rodnced, obscurely biangular, dorsal margin j straight, lateral very oblique, end between the angles ' truneatetl, ventral margin sloped upwards at the end, \ inrtatcd behind the centre, very slightly contracted in I he middle, umboes rather prominent, wrinkled with grannlo^c angularly diverging ribs; anterior side rather round. ; UbNsON. j Uah. India. \ cry much longer than U. creriitea, anil a more solid Species 332. (Mus. Taylor.) > KECTILI.NEARIS. Utt.tesld oiilougd, angmtd, tiihiidii, SI ill :hl. I, t ri If, 1 1 J.fiisco-viridesceHti, intiin salmoned et cae- i-iiirii.iii,iliiiiiiiiiix n(gosis,costellislubercuUfiri^angulatis (iniutis ; latere pustico biangulato, margine dorsali con- rexo, laterali declioi, termino inter angulos truncato, area postangulari oblique rugatd, margine venlrali redo ; latere anlico proiJticlo, margine dorsali ante umbones excaoato. The rectilinear Unio. Shell oblong, narrow, tumid, solid, smooth, brownish -green, salmon-tinted and liluish within, umboes rugose, ornamented with an- gular tuberculiferous riblets ; posterior side biangular, dorsal margin conve.x, lateral sloped, end truncated between the angles, postangular area obliquely wrinkled, ventral margin straight; anterior side pro- duced, dorsal margin excavated in front of the umboes. SOWERBY. llab. Kiver Columbia. Species 333. (Mus. Taylor.) IMo uiGiTlFORMls. Uh. testd angustd, elongaid, inmi- (lissimd. crassisiimd, epidermide nigra tavigaid indutd, ii/liis alba, ilrnlibidi anlicis magnis, laceratis, posticis laminatis elongali\ ; latere postico oblique, angulalu, ad terminum aiiguli acuniinalo; margine venlrali pnstice sHJjinflato, contraclo, medio n-rlu ; liilere anlico bre- viisimo, uu/bonibus magnis. The FINGER-SHAPED Unio. Shell narrow, elongated, very tumid, very thick, covered with a black, smooth epidermis, white within, anterior teeth large, jagged, posterior teeth laminar, elongated ; posterior side oblique, angular, acuminated at the end of the angle, ventral margin slightly swelled posteriorly, then con- tracted, straight m the middle; anterior side very short, umboes large. SoWKKBV. JJab. India. Slightly resembling U. Shepphardianus in general form, but verv much shorter, and more tumid and thick. ir,uc Pl.LXVL Yinoent Brocks, Imp Sowerby.del ctbih- U N I Species 334. (Mus. Sowerby.) Unio ebenus. Uh. testa, ohliqm mhquadratd., crasna, tumidd, fusco-nigricante, concenirice ngatd, rugis snbnodosis, intu.1 alba aut salmoned, dentibus crassis ; latere podico relate oblique producto, mnrginibus dor- sali et laterali amiafis, itmbonibus anliee teni/iiialibiis, prominentihun, acuminatk ; latere aittico brerissimo, margine laterali perpendiculari, margiue dor^uli bre- vissimo, ante nmboiies excavato. The ebony Unio. Shell obliquely subqiuulrate, thick, tumid, blackish - brown, concentrically wrinkled, wrinkles subnodose, inside white or salmon-tinted, with thick teeth ; posterior side obliquely produced when full-grown, dorsal and lateral margins arched, umboes terminal in front, prominent, acuminated ; anterior side very short, lateral margin perpeudicidar, dorsal margin very short, excavated in front of the umboes. Lea, Obs. on Unio, vol. i, p. 9-1. pi. 0. f. U. Hab. River Ohio. The small specimen figured by Lea is of a comparatively rounded-square form ; but the larger the growth of the specimen, the more the posterior part is obliquely pro- duced and flattened. Species 335. (Mus. Taylor.) Unio pullatds. Un. testa oblongo-cyUndroced, crassd, tumidd, lavigatd, tiigrd, iiitics sabpurpured ; latere postico oblique arigulato, aiigulo elevato, margi/ie dor- sali rectiitsculo, cimeato, laterali perobliqno, terminu subrotundo, medio complanato, margine veiitrali recto ; latere antico brevi, umboriibus Jiaud prominulis. TiiR SABLE-SUITED Unio. Shell oblong-cyliudrical, thick, tumid, smooth, black, p\irplish within ; posterior side obliquely angular, angle elevated, dorsal margin rather straight, cuneate, lateral margin very oblique, end rather rounded, middle flattened, ventral margin straight; anterior side short, nniljocs not prominent. Lea, Obs. on Unio, vol. vi. Hub. TJivcr Georgia. Species 335. (Mus. Taylor.) Unio cunuNus. Un. testa oblongd, suburcHidd, solidn, fusco-olivaced, conreiUrice fasciatd, inlits siibcupred ■ latere postico iiillaln, vix angulato, prope margiiiem ilorsalem radialim depresso, margine dorsali arcuato, termino latii rottnido, medio depresso, margine ventrali contracto, umlionibii>i priniiinnlis, kevigatis ; latere an- tico brevi, subqiiadralo. The coppery Unio. Shell oblong, slightly arched, solid, brown-olive, concentrically banded, copper-eolourcil within ; posterior side inflated, scarcely anguhr, ra- diately depressed near the dorsal margin, dorsal mar- gin arched, end widely rounded, middle depressed, ventral margin contracted, umboes rather prominent, smooth ; anterior side short, subquadrate. Le.\, Obs. on Uuio, vol. i. p. l(t+. pi. 1:2. f. 2i. ■ Hub. Mexico. Species 337. (Mus. Sowerby.) Unio i.atissimus. Un. testd subcompressd, utrinqnehinnti , rutnndo-subtrigond, lfpmgatd,fusco-olivaced, inliis albd, partim paUidissime rosed, margine cardinali medio ex- cavato ; latere postico latissimo, elecalini angulato, li- gamento ma.rimo, margine dorsali recto, cuueato, late- rali declivi, margine ventrali late sursum acclivi ; latere antico angustiori, margine dorsali depresso, de- clivi, termino subacuminuto, umbonibiis prominentibus, angulatis. The very wide Unio. Shell subcomprcssed, gaping on both sides, rounded-subtrigonal, smooth, brown- olive, white within, partly very pale rose, cardinal margin excavated in the middle ; posterior side very wide, with an elevated angle, ligament very large, dorsal margin straight, cuneate, lateral margin sloped, ventral margin with a wide slope upwards ; anterior side narrower, dorsal margin depressed, sloped, sub- acuminate at the end, umboes prominent, angular. Sowerby. Hab. United States of .Vmorica. The outline of this species resembles Unio dolahrafor- mis and others, but the shell is much more flat. Janunrv, ISfiS. UnwPl.LXVn. Sowertiy, del et lith Vincent Brooks, In U N I Sppfios ;;:;S. (.Mas. SowL-i-bv.) Unio Taitanus. I'll. Ifstd ubliiine siibrutundd, elfva/ii, crassfi, (iimkla, laeigald, olicaceil, iidus ulbd ; lali-rc postico ohliqno, superne aiiyulato, margine clonnli ile- presso, declivi, termiiio subacuminato, medio iiijlulo, margine ventrali coavexo, umbonibiis lermiiialibiiH, cht- vatis, aciitis ; latere antico brevimmo, niargbic domcili ante mnboiies excavato. Tait's Unio. Shell obliquely subrotuml, elevated, tiiick, tumid, smooth, olivaceous, white within ; posterior side oblique, angular above, dorsal margin depressed, sloped, end subacurainate, middle inflated, ventral margin convex, umboes terminal, elevated, acule ; anterior side very short, dorsal margin excavated in front of the umboes. Lea, Obs. on Unio, vol. i. p. 1.-j1. pi. i. f 11. Hub. Alabama; Judge Tait. niigni.ttim canrgali^ railiatii, inlii-s alhi!, daitlbiis mi- tins diiobns rl iino, lun'rath. crnxsiiisriilh, postirii iiiio el. dtiobiin laiiiiiiiili.i bn-vim-mlin : I ilcrc portico elevaliut aiigithito, ared poslamjiiUin lalcniiih'r cuiii- plaiiald ; latere unl'ico angiifitido, siihariiniiiuilu, iiiii- boiiibus prumiiientlbns. The TitrANGUi.AR Unio. Shell doHacifonn. thick, tuuiiil. ' smooth, yellowish, rayed with interrupted, au-u- hii'iy variegated green bands, white within, anteriiw j teeth two and one, jagged, rather thick, posterior, one and tw'o, laminated, and rather short; posterior side ' with an elevated an^le, postangular area laterally llatteiied; anterior side narrow, suliaeununated, um- boes prominent. 1 Uaknes. I JJnio furmmm (var.), Lea. Hah. T'nitcd States. The I'uii) fhniioms of Mr. Lea appears to iiave the postericn- area a little more spread than in this species. Species 330. (Mus. Taylor.) 10 \V YNEGUNGENSIS. Ull. testd Icllui, OVald, Sllb- tiiiiiidd, couceidrice tenuissime striata, oUvaced, ud HDibuiu'S et circa divaricatim rugosd, inlm mlmoiwd, iridenci'uti ; latere poslico oblongo, obtuse angulato, teniiiiio oblique triuicuto, infra siibacmninato, margine reiitrali (cqiialiter coiitexu ; latere antico breviiisculn, iiiriri/iiie dorsali depresm, ante iimbuiie.s excavato, ter- hiiiio rotiindo. E WvsEGUNGA Unio. Shell thiu, ovate, rather tumid, eoncentrically very finely striated, olive, on and about tlie umboes divergently wrinkled, inside salmon- tinted, iridescent; posterior side oblong, obtusely angular, end obliquely truncated, subacuminate below, ventral margin ecpially convex ; anterior side rather short, dorsal margin depressed, excavated in front of the umboes, end rounded. \, Obs. on Unio, vol. vii. p. S9. pi. 4..5. f 151. ';. Wvnegunga river, Nagpoor, Bengal. Species 34 0. (Mus. Sowerby.) TiiiANGULAKis. Un . tcstd donaciformi, crassu, tn- iiidd, Irevigatd, Jlacidd, fasciis viridibus, interrnptis. Species S-l-l. (Mus. Taylor.) Inio lioANOAKENsis. i'n. ti'-itd late coiiipfes.id, siiblrri/ie- coidi'd, siibriiijrin.i, u nlic'e fimcd, poslice nigrescenti, inliix pnrpiired ; lnU-rc pustico lato, obtiise angulato, post (iiiyidjiiii ciiniililiiis diiobiis distunter radialiin hnpreisnii, inarijiiie dursali Aecalu, subcouvexo, lalerali vhliijide triinciili),'niedio conijdanuto, margine ventrali eoiitnictii .■ latere unlico rolniidatiin iiihqimdrnto, ante nmbonrs ,:t- cavato, drpre-'sao, ituibunibiis pnrpiireis, lipvibm. Roanoak's Unio. Sliell wide, cumpressed. subtrape- zoidal, subrugose, brown in front. l)laelvish behind, piu'ple within; posterior side wide, nhtiiM.ly :iiii;iil;ii. l)ehind the angle impressed with t\\ o distant raihatnig canals, dorsal margin elevated, subeouvex, lateral margin obliquely truncated, middle flattened, ventral margin contracted; anterior side roundly suli(|uad- rate, excavated and depressed in front of tlie um- boes ; umboes purple, smooth. Lea. Obs. on Unio, vol. ii. p. ~'7. pi. 7. (. ~'l. Uab. Virginia. UNIO.— Platk LXVII. Species 3-i2. (Mas. Tnylor.) Unio EMARGlNATUS. U)i. testd oblongii, subci/Vuidraccii, tamidd, oUvacm, mridi conceiitrice fasciatd, iidus albd ; latere pudico obtuse anijulato, marg'me. dorsali nrtlmculo, luieruli obliquu, iermino basali obtiiso^ viargine vmtrali I'ectimculo, medio mbcontraclo, um- boiiibiis promidulis, lavibus ; latere utdico subtruncato. The emauginate Unio. Shell oblong, subeyliudriciil, tuiniil, olive, concentrically banded with green, white within ; posterior side obtusely angulai-, dorsal margin rather straight, lateral oblique, basal end obtuse, ventral margin rather straight, middle slightly con- tracted, iimboes rather prominent, smooth ; anterior side subtruncated. I.KA, Ob?, on Unio, vol. i. p. 174. pi. ix. f. Hi. Uab. -1 Figure 343. (Mus. Taylor.) Umo .Iayensis. AVe figure this elongated specimen as more nearly approaching the variety named (rquiUiis by Mr. Lea. Species 345. (Mus. Sowerby.) Unio sagiunatvs. L'n. testd subrotundd, lenticidari, so- lidd,Jluvid(j-fiiscd,conceHli-icerugaid,nnmdegranulatd, intiis ulbd, dentihm atdicis quadrjjariam dieisis, um- bonibiis elevatin, rotundis ; latere poslico ad Icrtiduaiii. subacumiiiaid, maryiue dorsuli decliri, laterulder com- presm ; hdere untico hrevhsimo, niargine superiuri valde decliri, termino acMiiiualu, ;nurgine reidrali rotundo. The SHAGKEENEi) Unio. Shell snbrotnnd, lenticular, solid, yellowish-brown, coueeutiically wrinkled, mi- nutely granulated, inside white, with anterior teeth divided into four, iimboes elevated, round ; posterior side rather acuminated at the end, dorsal margin sloped, laterally rompressed ; anterior side veiy short, upper margin strongly sloped, end acuminated, ven- tral margin rounded. SoWEItliY. Hab. V Umo pi.min. Sowerby, del et lith Vincent Brooks , Imp U N I 0. I'LATF, LXVIII. Species 346. (Mus. Taylor.) Unio Fi'RPlREUs. Un. ledd rliomboldm, subnigosa, $o- /idd, fusco-olivaced, intus purpured, salmoni'd aid alhd, dentibm crassis, laceratis; latere post ico obloiujo, oIj- iiise biangulato, post angiilum posteriorem canali ra- diatiiii iiiipressd, luarguw dorsali convexo, laterali rotnndidiia dt'divi, tcnidiio inter angulos triiiicido, Mcdiu depreuo, iiiargiiit' dormli vix siniiato, iimboniliits Iambus hand promiueidibiis ; latere antico a/igiisliori. mibrotiiiido. The pukple Unio. Shell rhomboidal, subrugose, solid, olive-brown, inside purple or salmon-tinted or white, teeth thick, jagged ;. posterior side oblong, obtusely biangular, radiately impressed with a canal behind the posterior angle, dorsal margin convex, lateral roundly sloped, end truncated between the angles, middle depressed, dorsal margin very slightly sinuous, umboes smooth, not prominent ; anterior side nar- rower, rounded. Uiiio romplanat/is. Lea; U.fid/gii/osiis? sordidus? Lea. Unio purpnr/iscens, rhomhida. car'niifirn, Georgum, glabrata, sulcideiis, Lamarck. Vide Hanley. Ifttij. Massachusetts. Species 347. (.Mus. Hanley.) Imio .TEJUNUS. Uh. testa obloi/go-ovatd, ndenti, nigres- ceiiti, te/iui, intus ccended, deidibus lamiiudis, laceratis; latere postico producto, subobliquo, vix uiigulato, area posticd sulcd radianti impressd, margins dorsali ar- cuato, declivi, termino retundo, margine ventrali rec- tiusculo, umbonibus lavibus, Jiaud jrrominentibus ; la- tere autico augtisto, brevi, subrotundo. The jejune Unio. Shell oblong-ovate, shining, blackish, thin, blue within, teeth laminated, jagged ; posterior side produced, siibobliquc, hardly angular, posterior area impressed with a radiating groove, dorsal margin arched, sloped, end roun't im-dio paulo eontraclo, umbonibus hniyatis ,■ laliTi- mdn-o ungnsto, superne declivi. The Lazarus Unio. Shell ttarrow, compressed, slightly arched, rather rough, brown, purple within, teeth somewhat thick; posterior side produced, very ob- scurely biangular, dorsal margin arched, sloped, trun- cated between the angles, ventral margin before the end and in the middle a little contracted, umboi-s smooth ; anterior side narrow, sloped above. Lea, Obs. on Unio, vol. v. p. 15. pi. 14. f. 'J. Hab. Abbeville district. Species 349. (Mus. Taylor.) Unio Hopetownensis. Un. testd subcuneiformi, subcom- pressd, nigra, laoigatd, intus albo-purpurascenti ; la- tere postico lato, biangulato, ad angulum anterioreni tumido, margine dorsali elevato, laterali convexo-declici, inter angulos truncato, medio complanato, margine ventrali recto ; latere antico angusto, breri, ad tcrmi- uum subrotundo. The Hopetown Unio. Shell subcuneiforni, subcom- pressed, black, smooth, purplish-white within ; pos- terior side wide, biangular, tumid at the anterior angle, dorsal margin elevated, lateral eonvexly sloped, truncated between the angles, middle flat, with veJi- tral margin straight; anterior side narrow, short, rounded at the end. Lea, Obs. on Unio, vol. ii. p. ;.'9. pi. 9. f. 04. Hub. Hopetown, Georgia. This species is much more expanded at the poslurior side and has a mure elevated angle than U. purpun-ns. Species 350. (Mus. Taylor.) Unio Downei. Un. testd crassd, tumidd, angustd, sub- rliomboided, caslaned, lavigutd, intits salmoneii, denti- bus magnis, laceratis ; latere postico biungutulu. inter January, 1SG8. UNIO. -Plate LXVIII. nnf/iilij-f Iruncato, nreii (UKjulari clfvidd, mi'd'ui ohliqui dcjjressu, margiae veidrali. contracto ; lalen aiiliru hrevi, aiigusto, declivi, umbonibus lavigatis, tiiinidis. Downe's Unio. Shell thick, tumid, narrow, subrhoin- boidal, chestiiut-colom-ed, smooth, salmon - tinted within, teeth large, jagged ; posterior side biangular, truncated between the angles, angular area elevated, middle obliquely depressed, ventral margin con- tracted ; anterior side short, narrow, sloped, nmboes smooth, tumid. Lea, Obs. on Unio, vol. ii. p. 29. pi. 9. f. ii. Hal). Hopetown, Georgia. .V reuiarkablv thick, solid, subcvlindrieal shell. U.NIO REGULAKls. I'll, ti'stii ti'Hiii, injlalii, ovatd, obficure fused, coiiceiilrici' KKhnnjDm, intus ctipreo-subviridi ; latere postico lata, miinjini- dorauli couve.ro, elevato, terniino siibuciimiiialo, iiiargiiie veidrali rotuiido, medio subcoiitraclo, uiubonibm liroibus, antici decUvis ; latere uiitico anijiatalo, leruiwo rotimdo. The regular Unio. Shell thin, inflated, ovate, dull brosvn, conceiitricallv' subrugose, greenish copper- coloured within ; posterior side wide, dorsal margin convex, elevated, end subacumiiiated, ventral margin round, middle slightly contracted, nmboes smooth, sloped in front; anterior side narrow, end rounded. Lea, Obs. on Unio, vol. iii. p. 81. pi. 2.5. f. 59. n,ib. French Broad liiver, Kast Teimc-:ee. riuc F/.LXIX. So'.'.Tji'iv. ael.et .::-. Vmcem,BTOoks.Ilay& Son, Imp U N I . Plate LXIX. Spei-ies 8o2. (Mus. Hauley.) Unio VerraUIANUS. Vn. tedCi chiujald, aiihcijlimlrncea, hand pectdiariter iiifeiiiiUatcrali, fnxco-uUraci'd conco- lore, 7'ugk confertin coiiceiitrii-ix (mmjh iiiiiiiisve nutein irregularibm) aii/ice el iniperne orimiii, manjbie dor- mli j)o.slice snirecto, vixque declivl, margine venfrciJi return, lumdd satis magna, margaritu, albidd, detilUnis cardbtalihus transversis, laciniatis. Verrau's Unio. Shell elongated, suboylindrical, not particularly inequilateral, of an unit'ovm olivaceous brown, with more or less irregular, close, concentric wrinkles on the umbonal region and in front ; hinder dorsal edge straightish, scarcely sloping ; ventral mar- gin retuse, lunule rather large, nacre wlutish, cardi- nal teeth transverse, jagged. Lea. Obs. on Unio, vol. vi. p. 21. pi. 27. f. 16. //,//-. Cape of Good Hope, S. Africa. \'ery closely allied to Caffer, but with coarser sculp- ture. It is moderately large and strong, has the teeth rather big than otherwise, and its pearl is generally stained with olivaceous yellow on the hinder portion of the um- l)ouul cavity. Species 3.53. (Mus. Taylor.) Unio Osbeckii. Uh. testd ohlongd, in inedio suln-entri- co-td, jiosiice compressd, fiisco-olivaced concolore, nates vfiisiis acutan porcis rudibus, nntice transver.iis, posiice angularibus, corrugatd ; extremitaie posdcd atteuuutd, aiigidatd, margine ventrali retmo, lumdd perangustd, inconsplcud, margaritd albido-cepridi'scente, dnitibus cardinaUbui traiisversis, di^ntibiis Inti'rurdiiis rah/e elongatis. OsHECic's Unio. Shell oblong, subventricose in the middle, compressed behind, of an uniform brownish olive-colour, umbonal region adorned with coarse raised wrinkles, the front ones transverse, the hinder angular ; posterior extremity tapering, angular, ven- tral uiargin retuse, bmule very narrow, obscure, nacre bluish-white, cardinal teeth transverse, lateral teelii Hiucli elongated. Pmi.ippi, Ab. >f. Conch, iii. ; Unio, pi. 3. f. 1. Unio Bouglasia ? Gray. II, d.. China. lines are likewise visible upon the umbonal slope in the vicinity of the ligament. The valves are not very thick, the beaks are acute, rather prominent, anil much noduled. The umboual ridge is rather angular at its commencement, but eventually is obtuse. The nacre is irideseeut ))0ste- riorlv, and the cavity beneath the umboesmueh excavated. Iieside< principal sculpture, some acutangular raise Species 83. (Fig. «, Mus. Kanley.) Unio perdix. Vn. tcdu magna, ovali, crassd, nitidd, sidjventricosd, oUvaced, mncuHs jjiillis reinotis postici sparsim radiatd, subleevigald, rugis increini'idi anticP subplicatd ; latere antico liaud breri, subangusto, ad extremitatem rotundato ; exlrenutaie podicd obtuse subbiangulatd, margine ventrali siibarcnato, ninboiiibns latis, hiniild avgustd ; margaritd albd, deidihii^ car- dinalibus magnix, eininentibiix. The partridge Unio. Shell large, oval, thick, glossy, subventricose, olivaceous, with a few distant dusky, radiating spots on the posterior half, nearly smooth, but with plicifovm wrinkles of growth in front ; an- terior side not short, somewhat narrow, rouiuled a1 its extremity ; posterior end bluntly subbiangulated. ventral margin subareuated, umboes broad, lunule narrow, nacre white, cardinal teeth large, prominent. Lea, Trans. Anier. Ph. Soc. vol. v. p. .5. pi. 11. f. 31. Unio pectorosus, Conrad. Hab. Elk river, near its junction with the Tennessee. This is not the species erroneously so named in Plali- XVIII. Species 3.54. (JIus. Hanley.) Unio clava. Un. testd ponderosd, subrtwrnljoideo-cnnei- formi, antici truncatd satisqne tnmidd, postici altenii- ald, compressd, fused concolore, Irrvi, natihus valde eminentibiis, hinuld permagnd, margaritd albido-ceern- lescente, dentibus cardinalibus magnis, pyrumidalibus. The club Unio. Shell very heavy, of a somewhat rhom- l)oidal wedge-shape, truncated and soiuewluit inflated in front, gradually compressed and tapering behind, of an unilbrm dirty brown, smooth, beaks very pro- minent, lunule very large, nacre bluish-white, cardinal teeth large, pyramidal. Lamaiu-k, Anini. sans vert., vol. vi. pt. 1. p. 71. UNIO.— Plate LXIX. Uiiio Mudioiifonms, Say (teste Lcii). Unio scaleida, Rof. ("teste Lea). Hab. Western waters in N. America. Tlie uraboual ridge, which is ratlier wide and conspicu- ous, is preceded by a broad shallow concavity. There is a certain peculiarity in the extreme divergence of the beaks from each other. The hinge-margin is very deep in front. Species 355. (Mus. ILuilcy.) Unio .ambiguus. Un. tedd subovali, vix inceqidlaterali, mibtenui, haud ve?dncosd, oUmced, vix feel miidmej radlatd, ant'ici conceidrice et coiifertim subriigosd, pos- tire Ireci ; mtirgiiie dorsali utriiii/UK angulalo, posiicH subiicdm; maryiiie ventrali coiwexo., natibus hand ■libus, iiiargurUd si/uallde albidd, denlibiis C(tr- diiMlibua tramversis. The doubtful Unio. Shell suboval, scarcely inequi- lateral, rather thin, not ventricose, olivaceous, not rayed (or at most very indistinctly so), densely and concentrically wrinkled in front, smooth behind, dor- sal edge angulatcd at each end, somewhat rising be- hind, ventral margin convex, beaks not prominent, nacre dirty white, cardinal teeth transverse. Parkeys, MSS. in Philippi, Ah. N. Conch, vol. ii. Hub. Australia. Runs very closely into the characters of Un'm Aiidralli, Lam. (Moreiotdcus). It has neither a lunule nor an um- bonal ridge. The pearl is often stained with olive-colour in the umbonal cavity, and the cardinal teeth are so trans- verse as to appear lateral. UimFl-LXX. Sowerby.deletkth Vincejit Brooks Day&Son,lrop U N I Species 306. (Fig. a., Mus. Hauley.) Unio MULTIRADIATUS. Till, testd magna, suhovatd, si/iia- lidi luted, radiis viridibus anr/nstls iindiqite coiifeiiim pictd, mhltevigatd ; latere aidico hand peciiUariter irevi, angusto, rotundato ; extremitate posticd subb'mn- gidatd ; viargiue ventrali arcuato, ulniique (at aiitice prasertimj acclivi; muboiiibns latis, emmeidUjus, lunuld angmtd, margaritd albidd, derdibns cardiiiaUbns hand laciniatis, derdibns laferalibus arciiaUs. The many-rayed Unio. Shell large, subovate, dirty yellow, everywhere painted with close and rather narrow green rays, not sculptured ; anterior side not particularly short, narrow, rounded ; posterior ex- tremity subbiangulated, ventral edge curved, rising at both extremities, especially in front, umboes broad, projecting, lunule narrow, nacre white, cardinal teeth not laciniated, lateral teeth curved. Le.^, Obs. on Unio, vol. i. p. 48. pi. 9. f. 15. Uiiiofasciolm, Cbnrad (as of Raf.). Unio ligamentiiia, Deshayes. Hab. Ohio.' This is not the species erroneously so designated in Plate LXI. It is a strong glossy shell, with its hinder dorsal edge straightish and scarcely sloping, no distinct umbonal ridge, and decidedly prominent cardinal teeth. Species 356. (Mus. Hanley.) Unio camftodon. Un. testa lavi, oblongo-subrJiom- boided, vix iiifcqidlaterali, Jiavo-olivaced, zonis livido- bniiiiieis -tparsiin ornatd, huml nuliald, vix subveulri- cosd ; margine dorsali (I III iii: rcriii, il,„iisso, postice vix miniiiie declioi ; margine ventraii retu-io, nalibus acidis, indiiudis, porcis obliquis conceidrice ornatis, lunuld aiigustd, profunda, margaritd aliido-crerulescenle. The bent-tooth Unio. Shell smooth, subrhombic-ob- long, scarcely inequilateral, olivaceous-yeUow, with two or three livid brown zones of growth, not rayed, at most subventricose ; front dorsal edge straight, lower than the almost horizontal posterior one, ven- tral margin refuse, beaks inclined, acute, adorned with raised, obliquely concentric wrinkle-^, lunule narrow, deep, nacre bluish-white. Say, Amer. Conch, pi. ii. Unio dcclivis, (Conrad, i\Ion. U. pi. 23 iteste Lea). Unio Sayu, Tappan (teste Lea). Hub. New Orleans, N. America. The umbonal ridge, which is succeeded by two approxi- mate sulci, with a raised strip between them, is far from conspicuous. The hinder extremity is blrmtly subbiangu- lated, the umboes are prominent, the ligament small and narrow . Species 357. (ilus. Hauley.) L'nio Clairbornensis. Un. tedd validd, subvenlricosd, magix n/inusve ovatd, antice. hand peculia/'iter brevi, Jlavo-subolioaced concolore, plicis increinenti obsoletis nlrinque corrugatd, in medio Icevigalu ; margine ven- trali in medio retuso, alder convexo, lunuld ineon- spicud, margaritd albido-ccerulescente, denlibus cardi- nalibus magnis, pyramidalibus, denlibus posticis (vel lateralibusj elongatis, sayrinalis. The Claikborne Unio. Shell strong, subventricose, ranging in form from subovate to obovate, not par- ticularly short in front, of an uniform tint of some- what olivaceous-yellow, with obsoletely pliciform wrinkles of increase at both extremities, otherwise smooth ; ventral margin indented in the middle, con- vex at each end, no distinct lunule, nacre bluish- white, cardinal teeth large, pyramidal, lateral lojig and shagreened. Lea, Obs. on Unio, vol. ii. p. 105. pi. S-i. f. 115. Hab. Alabama river, near Clairborue, N. America. The front extremity is rounded, the hinder dorsal edge somewhat raised. The cavity of the beaks is deeply ex- cavated, anil the umbonal ridge by no means conspicuous. Species 358. (Mus. Hanley.) Unio platyrkhinchoideus. Un. testd elongald, haud parvd, subtenid, subcylind raced, nilide fusco-custii ned concolore, lavigatd ; antice brevi, postice produetd el attenuald, inferne retusd, natibus satis eminentibiis, lanuld iucompicud, margaritd albidd, dentibus cardi- nalibus transversis, haud magnis. The platyrrhincus-like Unio. Shell elongated, ra- ther large, not very strong, glossy, subcylindraceous, of an uniform rich brown, smooth ; anterior side short, posterior side produced and attenuated ; vcn- UNIO.— Plate LW. tral margin somewhat incurved, beaks rather promi- nent, lunule obscure, nacre whitish, cardinal teetli transverse, not large. UuPi-y, Moll. T. et PI. France, p. fi49. pi. 27. f. 16. Hah. .Arcachon, Western France. The front extremity is angular above, and rounded be- low ; the hinder side gradually tapers to a rounded peak. The umbonal ridge is not prominent ; the pearly white of the interior is, for the most part, stained here and there with livid olive. Species 359. (Mus. Hauley.) Unio PowELLll. Uh. testa obhngd,m.odlci iiuequilaterali, mbveidricosii, nitide fusco-flavida. concolore, Icevigatd, anti.ci perangiidd, rotinidatti, pustice obtusismiid et mill turn latiore ; Diargine dorsaU unlice decUvi, jioslic'e suiacclioi, marguie ventraU in medio subretuso, pos- iice arcuato, margaritd albidd, dentibus cardinalibus laciidatis. Powell's Uxio. Shell oblong, moderately inequilateral, subventricose, of an uniform glossy brownish-yellow, not sculptured ; front extremity very narrow, round- ed ; hinder extremity much broader, very blunt ; front dorsal edge sloping, hinder one rather elevated ; ven- tral margin somewhat indented in the middle, arched behind, nacre whitish, cardinal teeth jagged. Lea, Obs. on Unio, vol. v. p. 26. pi. 19. f. 25. Hai. Saline river, Arkansas, N. .Vinerica. The valves are rather large and strong, with their um- boes, which are almost always eroded, not pai-ticularly prominent. The pearly interior is stained with yeDowish olive in the umbonal cavity; the hinge-margin is rather narrow, ami the nmlional ridge but little projectinu. L'raxjPl.LXXI. Sowerty, del et litii Vmcem, Brook-s Day&Snn. Imp U N I 0. Species 3i;0. (:\Iiis. llaiiley.) Unio coitRUGATUS. Uii. lesld parvd, riri//i, snhvc-ntri- ■■usd, mar/is miiiiisve ovcdi, vix inaqidlutendi, ItErigatd, porcis auteiii Uiicnrihrn ohlh[nh utdes versus emiiieidi's mibr(id[(dd ; iiiargiiie dormli vix dcclivi, aidiw con- cava ; Mitn/inc reidraJi convc.ro ; Itinidd didiiicld, iiinrijantd idh'uhi, di-ntibiix curdhialihua validis, hwi- iiintis himl hn,ii„idis. The wrinkled Unio. Shell small, green, subveutricose (but varying in shape from elliptic to rounded oval), scarcely inequilateral, smooth, except near the pro- minent beaks, which are adorned with somewhat ra- diating, oblique, linear ridges ; dorsal edges not much sloping, the front one concave ; ventral margin convex ; lunule well marked, nacre nearly white, cardinal teeth strong, jagged, not lamellar. Chemnitz {Mi/a), Conch. Cab. vol. vi. pi. 3. f. 33. Mya spuria, Gmelin. Ilab. Coromandel, etc., East Indies. Mullcr's description of his 21>ja comgata must have lieen taken fVom very young individuals. The shells de- lineated by Chemnitz and Wood evidently belong to this species. It is more than probable that the U. Wyuetjun- geu-iis of Lea is a transverse form of this variable species. Species 361. (Mns. Hanley.) Unio Forbestanus. Uh. tcstd pared, ohloiigo-subquad- rald. ii,il.< ',,,/■, ' ii'i/iii, niticlu, subl/evigatd, pos- tirr s/i/irr ■ , /' ,- ',-olivaced, rudiis angitstis vi- ridi-nlir,h , i-^ iii,,:i,rr niiigis coiispicuisj orimld, area pQsticd exireiiui riigis elmatli obliquis sparsiiii scidptd; murgiue ventrali valde convexo, a/dice acclivi, lunula incouspicud, margaritd alhidd, deulibus cardinalibus validis. FoRBEs's Unio, Shell small, s(|uarish-oblong, decidedly short in front, not thick, glossy, subvenlricose be- hind, yellowish-olive, with narrow rays of olivaceous green, which are more conspicuous posteriorly, smooth, yet with raised oblique wrinkles behind the umbonal ridge ; ventral margin curved, rising in front, lunule iiiconspicuous, nacre whitish, cardinal teeth strong. Le.\, Obs. on Unio, vol. v. p. 20. pi. Ifi. f. 17. llab. Savannah river, North America. The uraboes are eroded, and not prominent, the troiit extremity is rounded, the hinder termination bluntly biaii- gulated, the hinder dorsal edge straightish and scarcely sloping, the nacre iridescent, and the umbonal ridge con- spicuously angled. Species 3B2. (Mns. Hanley.) Unio N.aTALENSIS. Un. testa parvd, doiigulo-ohtmigii. coiiipressinscidd, sijiiaUde flavo-olivaced, Itand radudd, riigis devalis nidibiis irregidaribns (atdice conferliori- igisijn itlis, postici latioribiis magisqiie obs> Itdis) nudiqne co/iceidrici' scidptd ; margine ventrali subrdaso ; dentibus curdiiudibus hatid lamiuatis. The Nat.vl Unio. Shell small, elongated-oblong, some- what compressed, dirty olivaceous-yellow, not rayed, concentrically sculptured throughout with coarse and irregular raised lines, which are sharper and closer in front, broader and more flattened behind ; ventral margin slightly retuse ; cardinal teeth not lamellar. Lea, Proc. Philadelph. 1864. ! Hab. Natal, South Africa. I The whitish nacre is stained with olivaceous yellow in I the uMi-e r(ni(M\c |Hirii.iii ul' tlir interior. The valves are j not tliiek,llie anttrior bide is decidedly short and rounded i at its extremity, the posterior end is rotundately subbiau- [ gulated, and the broad and flattened umbonal ridge is ' succeedeil by a distinct though shallow groove, and :i second, though very faint one, beyond it. Species 363. (Fig. a, b, Mns. Hanley.) Unio RETUSUS. Uu. testa ulld, snhcordido-jiijrinuiilali, solidissimd, siiblffvigutd, rvgis iucn-uhtdi Imdiini snb- plicatu, olivaceo-jlavesreide (aidicv saqiiiis satiiridwn-, i.e. fusco-idgresceide) , hand radialu, latere aidiai per- breci, rotandalo, coiiipressiuscido ; inargine veidrnli valde arcuato ; uatibus ma.rime emiiii'tdibus aidrorsui/i incUnatis, margaritd piirpiired, deidib/is cardinidibns permaguis, laciniatis, pgraiiddidib/is. The blunt I'nio. Shell somewhat heart-shaped j)yra- luidal, higher than broad, very solid, smooth, except for the plieiforui ridges of increase, of an olivaceous -March, 1S6S. UNIO.— Plate LXXI vellow, which usually deepens in front to blackish- liroivn, not rayed, somewhat compressed at the very sliort and rounded anterior extremity ; ventral margin mucli arcuated ; beaks remarkably prominent, curv- ing forward, nacre purple, cardinal teeth peculiarly large, jagged, pyramidal. Laiiakck, Anim. sans Vert. vol. vi. pt. 1. p. li ; Con- rad, Mon. U. p. 19. pi. 8. U. torn/, Eafin. Ann. Sc. Phys. U. obttmi, (Desh. ? in) Cuvier, lu'gne Anim., teste Lea. Hah. Western States, North America. The valves are moderately large, and are only rayed, if at all, by a few obscure lines upon the swollen nmbonal I'egion ; the hinge-margin is very broad. Species 364. (Mus. Hanley.) Jxrc) SrcuLUs. Un. tenia elongato-ohlonga, satis coii- vfixd, 7utide luteo-ol'maced, postice productd et squalide viridt, liaud radiatd, suhlmvigatd ; margine veutrali rduso ; nutibm aciiiis, satis eminentihus, serie dupUci porcorum (ijua angulos valde ohtusos juncturd for- muut) subiransversim ornatis; lunula inconspicud, marc/aritd alhido-crenilescenle, dentihm cardinalibus transvn'sl-i. iiE Sicilian Unio. Shell elongated-oblong, mode- rately convex, shining olivaceous yellow, changing to dirty green near the posterior termination, not rayed, nearly smooth ; ventral margin indented ; beaks acute, rather prominent, adorned with two sets of coarse and somewhat transverse raised wrinkles, which meet at a very obtuse angle; lunule incon- .■^picuous, nacre bluish-white, cardinal teeth trans- SwAixsoN, Tr. Mahicol. p. 2S2. f 58. Vnio TtiHoni, Payrandeau f Hah. Sicily, etc. Should this prove the Tuiionl of Payrandeau, that name must take priority. It is certainly quite clisiiia-t from piclorum. The valves are rather strong, not large, and inclined to be reniform, narrow and rounded at their anterior extremity, and produced posteriorly ; the hinder dorsal edsre is sliirhtlv elevated. Species 365. (Mus. Hanley.) Unio bilineatus. Uu. Icstd vblcngd, lenui, lavi, modice comicxd, viarginem versus oUvuced, ad umbones ferru- giited, viiuime radiatd, porcis geminis linearibna in et supra casta in umbonalem inconspicuam ornatd ; mar- gine dorsali subrecto ; margine ventrali convexo ; ria- tibiis /laud emineHtihus, Iwiuld nulla, niargaritd al- hidd, deiitibus cardinalibus laiiiiiiatis. The two-lined Unio. Shell oblong, thin, smooth, glossy, moderately convex, ferruginous on the nm- bonal region, changing to olive elsewhere, not rayed, with two closely adjacent linear ridges upon and beyond the inconspicuous umbonal ridge ; dorsal edges nearly straight ; ventral margin convex ; beaks not raised, no lunule, nacre whitish, cardinal teeth lamellar. Lea, Obs. on Unio, vol. i. p. lOS. pi. 11. p. 19. Hall. Hivcr Hoogly, Hindostan. In this species, which rarely attains to any considerable magnitude, the linear ridges are only apparent near the umboes, the anterior side, which is not particularly short, is angnlated above and rounded below, and the posterior extremity rotundately subbiangulated. The nacre lias occasionallv a slislit tinge of salmon-colour. UnwFI LXXIL Sowerby del et ]iLh \incent Brooks,"Day(!:^on Jmp U N I Tlatf, LXXII. Species 36fi. (Mus. Hanley.) Unio eavistellus. Uii. testa parva, oblongo-subqiiatl- ratd, Jiaiid pecidiariter hueqiiilaterati, compressiiis- cuM, satis validd, ferriigiiieo-olivaced, mblavigatd, minimi radiatd ; margine dorsali ulrinqiie angidato ; margine ventrali coiivexo, margaritd alljo-livescente, detitiliiis cardiuaJibus va/idis, liand lamiitatis. The little eusset Unio. Shell small, squarish-obloiig, not very inequilateral, rathei- compressed, motlerntely strong, ferruginous-olive, neither rnyed nor sculp- tured ; dorsal margin angulated at each end ; ventral margin convex, nacre livid white, cardinal teeth strong, not laminar. MoEELET, Testae. Novis. vol. i. p. 29. Hah. Lake Ysabel, Guatemala. There is no distinct umbonal ridge. Species 3G7. (Mus. Hanley.) Unio stuiatulus. Un. testa parvd, solidd, si(bi-eiitri- cund, subrhombed,fusco-oUvaced, hand radiatd, snblep- rigatd ; margine dorsali utrinque siibdeclivi ; margine n-iitrri/i coiwexiiiscnlo, antice arciiatim acclivi, ex- Iriu.i'ilate posticd latiiiseuld, rotundnto-subbiangidatd, vinryarifd (dbido-cferidesceide, dentibiis i-ardiiwlibus miiijiris, laciniatis, hand transversis, dci/lifjiif: ln/eruli- bii^ urciialis. The si'RioLATED Unio. Shell small, solid, subventri- cose, subrhorabic, olivaceous-brown, not rayed, smooth or nearly so; dorsal edges slightly sloping; ventral margin rather convex, arcuatedly rising in front, hinder extremity rather broad, rotundately sulibiangulated, nacre bluish-white, cardinal teeth large, jngged, not transverse, lateral teeth arched. Lea, Obs. on Unio, vol. viii. p. 59. pi. 2. f. 302. Jfab. Roanoke river, N. Carolina, U. States, N. America. Although the characters are chiefly negative, yet this strong dwarf species can easily be recognized. The hinge- margin is broad, and the inconspicuous umbonal ridge is chiefly defined by the unsculptured concavity which fol- lows it. Species 36S. (Mus. Hanley.) Unio VELAEis. Ua. testa pared, tenui, compressiusculd, jiallid} riridi, hand radiatd, sulilavigatd, extremitate aiiilcd perangii^td ; latere posliro alato ; iiiarffiiii' ven- trali arcuato, aiitice sMto acclivi ; uatibits peracufis, emiiientibus ; liaiuld excavatd, margaritd alba, deiiti- bus cardiiialihus magnis, apprvximatis, lauiiiiatis. The sail-like Unio. Shell small, thin, rather com- pressed, pale green, neither radiated nor sculptured ; anterior extremity very narrow ; posterior side winged, ventral margin arcuated, rising abruptly an- teriorwards, beaks very acute, prominent, luiude ex- cavated, nacre white, cardinal teeth large, lamellar, approximate. Benson, in Hanley Eec. Bivalv. p. 3S5. pi. 23. f. 42. Uab. Assam. The abrupt fall of the front dorsal margin in this syni- phonote species gives a seeming projection to the beaks. Both dorsal edges are angulated above, and rounded off below; the hinder dorsal edge is much elevated. The compression of the valves is especially conspicuous on the anterior portion of the shell. Species 36'.». (Mus. Haidey.) Unio BOTUNDUS. Un. testa rolnndatd, untire. brevi el angustd, postice. latissimd et subalatd, medio mibrenlri- cosd, suhlfevigatd, superne uutem. rngis increinenti tennilms elevatis concentrice scul/itd, mi/ro-oliraci-d concolore ; margine dorsali antice valde dedivi, poslire acclivi, utrinque angnlato ,- margine ventrali ralde ar- euato, antice oblique acclivi, humid pernngustd, pro- J'undii, natibus Jiaud eminentilnin, wurgarild alhidd, dentihns cardinalibns laciniatis, transversis, dentihnx lateralibus arcitaiis. The eounded IInio. Shell roundish, short and narrow in front, somewhat winged and very broad behind, subventricose in the middle, smoothish, yet closely marked above in front with fine raised wrinkles of increase, of a uniform dark olive-colonr ; dorsal edgi' much sloping downwards in front, rising behind, an- gulated at each end ; ventral margin much arcuated, rising very obliquely in front, lunule very narrow, profound, beaks not much elevated, nacre whitish, cardinal teeth jagged, transverse, la'eral teeth much curved. Spix, Test. Bras, pi, 2G. f. 3, 4. Hab. Brazil. The umbonal ridn'C is very indistinct. UNIO.— Plate LXXII. Species 370. (ilus. Hauley.) Unio subtentus. Un. testa oblongo-elmigatd, antice ari- (justn, pontic!; producta, satis compressd, luted, radiis ■mridibus, iiderruptis, remoiiiisculis, lutiuscidis ornatd, sublavigntd, ared posticd plicis divergeniibtis, talis, depressis, eonspictie sculpld ; margine dorsali postico convexiusculo, Imnd declici, Itmiild laneeolaln, inarga- ritd palUdi aiiroitlio-nibrd, dentibus cardinuUbus hand laiiiiuiitis. The corded Unio. Shell elongated oblong, mrrow in front, prochiced behind, rather depressed, dirty yel- low, with rather broad and ratlier distant dnsky green interrupted rays, sniootli, except upon the umbonal slope, wiiich is adorned throughout with broad and depressed diverging folds; hinder dorsal edge rather convex, not sloping ; hinule lanceolate ; nacre salmon-coloured, cardinal teeth not laminar. Say, Amer. Conch, pi. 15. Hab. S. Carolina, N. America. Moderately large, rounded in front, and not provided with a well-marked umbonal ridge. Species 371. (Mus. Hanley.) Unio KENIFORJIIs. Un. ledd olihngo-subreniformi, va- lidd, subveiilricutiii, brmnwd concolore, sublcevigald ; margine dorsali postico brevi, rectivsculo, haud declivi; margine ventrali incurvato, natibus aciitis, maboni- bm satis eminentibus, luiitild inconspici/d, margaritd n/bido-C(Priilescei/le, dmtibns cnrdiiuilibiin vnlidis, cris- lalis. The kidney-shaped Unio. Shell oblong-subrenifonu, strong, subventricose, of a uniform brown, neither rayed nor sculptured; hinder dorsal edge short, straightish, almost horizontal ; ventral margin in- curved in the middle, beaks acute, uuiboes r prominent, no distinct lunule, nacre bluish-v cardinal teeth strong and crested. Schmidt, MSS. in Eossm. Icon. ])t.. 3, p. 31. f. ;;;13 Hah. S. Germany. This somewhat rare shell (not impossibly a variet; ther than a species) is rather short and rounded in I somewhat tapering (at least in the adult) beliiml. umbonal ridge, which is rather indistinct, is succeedc a broad and siiallow groove. Species 373. (Mus. Hanley.) Unio angustatus. Un. testa elongatd, postice altenn- atd et truncatd, compressd (prasertim inferne juxta wedluni), piced concolore, lavigatd ; margine dorsali siihrecto, vix declivi, utrinqiie angiilato ; margine ven- trali retiiso, antice siibrepente arcnatim acclivi, ared posticd extrewd concavd, margaritd alba, dentibus car- dinalibns triiusversis. The narhowed Unio. Shell elongated, tapering and truncated behind, of a uniform pitch-colour, smooth, compressed (especially below near the middle) ; dor- sal edges nearly straight, scarcely, if at all, sloping, angulated at each end ; ventral edge indented, rather suddenly arching upwards in front, area beneath the ligament concave, nacre white, cardinal teeth trans- verse. Lea, Trans. Amer. I'h. Soc. N. S., vol. v. p. 4. pi. 17. 1. 43. Hah. Congaree and Cooper rivers, S. Carolina, N. Ame- The umbonal a shallow groove conspicuous, and is succeeded I'luv.n.LWU "niicem.fli-cok6,DayiSQnJmp U N I 0. l'i,ATi: LXXIII. Species 373. (Mus. Hanley.) Unio NUX Persica. Un. testa perparv.-i, snlidd, ub- longo-subrhomboidea , postici oblique b'uiiigidutd, fusco- olivaced concolore, pticis riidibus undique scidptd, plicin antice deormm declivibus, delude breviter angu- latbn acclivibus, po&tremo transvenis (liand conceri- trickj ; casta umbonali angtdatd, margaritd alba, dentibas curdliialibus magnis, hand laiiiinatis. The walmut Unio. Shell very small, solid, oblong- subrhombic, obliquely biangulated behiiul, of a uui- tbnn dark olive, everywhere boldly scul^Jtured by coarse folds, which in front run obliquely downwards towards the centre of the disk, then diverge for a brief space upwards, and finally slope almost trans- versely (not concentrically) to the hinder margin ; umbonal ridge angular, nacre while, eanluial teeth large, not laminar. DiXKEK. Zeitschr. Malak. 1848, p. IS:;. Hah. Chnia (teste Dnnker). Iteminds one of a young Osbnkii. The anterior side is ^hort, the beaks rather prominent, and the concave area beneath the ligament is usually marked with a few line divergent raised wrinkles. Species 37-i. (.Mus. Hanley.) I'sio .\ il.oTlcus. fit. testa parvd, validd, ijcali-siib- qiiadrutn, siibveiitricosd, olivucei concolore, riigis ele- vatis riidibus (el antice conferlis) coucenlrice scidpld, latere aiitico hand peeuliariler brevi, latere poslico K'ibbiaiigula/o ; margine ventrali vix retuso ; area pos- ticd extreind cniicavd, liris obliqitis divergentibus coii- fertiin ornatd, natibus aciitis, hand eminentibu^, lu- nula profunda, lanceolatd, margnritd nitide albido- rnbescente, dentibus cordinalibus siiblaminatis. The Nile Unio. Shell small, strong, subquadrately oval, siibventricose, of a uniform olivaceous tint, with coarse, raised, concentric corrugations, which in front are densely arranged, anterior side not very short, posterior side subbiangulated ; ventral margin scarcely indenteil ; extreme posterior area concave, and adorned by crowded, obliquely divergent raised lines; bt-aks acute, not prominent, liinule deep, lan- Caili.aui), Voy. a Meroe, vol. ii. pi. Gl. f. 8, '.J. Hab. The river' Nile. The beaks :iie adurnnl with two rows of grains, besides some less marked rliverging raised lines. The scidpture is that of the Indian species. The U. puinilio of Ziegler (MSS. ?), and the U. Parreysii (our .Egypliacns) of \q\\ dem Bnsch (in Philippi, Ab. N. C. vol. iii. Unio, pi. 5. f. G), are given as svnonvnis bv Tea. tedu piirrtl, Hulnhi. rmtr suhrhiJiubuuled, late,',, niaenlis sii!,qiindr„lis ,ii,jru.iliri- dibiis. serie unieii, postiee ornatd, e.vtri'hiitale pusticd vbtiisissiine sulihiaiigiilatd ; Margine ventrali convexo, anlire aerliei ; niargaritd alba, denlihus cardinalib/is validis, permagnis, pyramidalibiis. The intermediate Unio. Shell small, solid, intlateil, subrhombic oval, yellow, with a posterior radiating row of somewhat square distant dark-green spots ; [lostcrior extremity very bluntly subbiangidated ; ventral margin decidedly convex, rising in front : nacre white, eanlinal teeth very large, strong, pyra- Lea, Obs. on Unio, vol. viii. p. Si. pi. 10. f. 227. Ilab. Coosa river, Alabanni, North .America. The rather ineonspicuous nmbunal ridge is preceded by a single row of spots. Species 376. (.Mus. Hanley.) Unio CokdaTUS. Un. tesld suhcordato-pyranddali, sulidd. ad unibones Injlald, postiee comjiressn; fusco-castaned, Icvrigutd, antice perhrein, subtruncatd, inferne peeuli- ariler ml iihdiih':. postici rofundato-subcuneifdrnii ■ wargiei' rriilrnli •intici arcuato, postiee ineurcalo : nalii. 'il,i,s, lunuld lata, dentilws eardi- THt llEAKl- :: ■. ' i 'n. Shell solid, .uulien ■M tiie unibor. smooth, che.l nu-bnuui, ant, UNIO.— Plate LXXII nent, luniile broad, cnrdiiinl teetli Inrii-e, much laci- iiiated. (-'ONRAD (as of llafiii.), MouoiioliLiis cnixi.s, IkiuiI cuiiiiriili- Ims ; inargaritd albido-crcrnlcscenk, miicidis Ik-idi.t fiicald ; denl'tbm curd'muUbus iirinsveisix. The sTAKVEl) Vnio. Shell thin, eouipressed, elongated- oblong, subrcniform, ronnded at both ends, much ])roduced behind, of an uniform olive-colour, almost smooth ; liinder dorsal margin rather convex ; ven- tral edge refuse ; no distinct nmbonal ridge ; beaks eroded, not prominent ; nacre bluisli-white, with livid stains ; cardinal teeth transverse. nouLi), IVoc. Boston Soc. N. H. vol. iii. ]). 2'.)t. i/ab. AValla Walla, (Jregon, North Ameriea. iientibus ; marijiirild (dbidi'i ; dnlihm Cdrdhinlibia tramvenk. C.\PiGHOLo's Unio. SIk^II thiu, compressed, elongated, less inequilateral than usual, of an uniform olive- eoloiu-, nearly smooth, narrow and rounded iu front, blniitlv subliiaiiuidaled behind; posterior dorsal edge a little rising and slightly eui'ved; ventral mar- gin retuse, arching upwards in front ; no distinct lunule ; beaks acute, moderately projecting ; nacre whitish, cardinal teeth transverse. Payk.^udeau, Cat. Moll. Corse, p. GG. pi. i. f. 4. Hub. Corsica, etc. A moderately large shell, allied to, yet perfectly dis- tinct h-oui, piciuniiii. The umbonal ridge is not elevated. Uld U( Species 393. (]\Ius. Hanley.) sCENS. ill. tedd eloiif/uid, siibiiiceqiiilaterali, Species 392. (Mus. Hanley.) Unio (Jamgliolo. Uu. iestd teimi, cou/pn'xsd, ('/o)ii/ii//i, hand fecidiarilcr inrFqiiiUderal'i, (dlraced, concolorc, xublarigaid, anllci aiignxtin^ rnlmnhdd, postice. ,siib- bianyulald ; margiiw pod'wu dursidi hniler acclivi, convexiusculo ; margine rcnlrali reluso, anike iifrii- atini acclivi ; luiiuld nulld ; natibus acidis, saii.s cnd- ti'iuii, di-pressd, subcylindraced, antici in/erne /liaide, iididi'jliird, olivaceo-viridi obscim radiatn, Icevigald ; iimrgiiic dof.wli autico vix minime declivi ; margins vi'vlr(di antice arcualiiA acclivi ; lunula, costdque urn- bonaliiiicoiisjiicuis, imbonibns hand emineniibus ; niur- gnritd mipi'ViH' piirpiiriui, iiifirni (dbidd ; dcntibiis im- perfictis. The gaping Unio. Shell elongated, less inequilateral than usual, thin, depressed, somewhat cylindraceous, gaping veiitrally in front, glossy yellow, with ob- scure olivaceous green rays, smooth ; front dorsal edge scarcely at all sloping ; ventral margin arching upwards in front ; lunnle and umbonal ridge incon- spiennns, ninhoes not projecting; nacre purple above, Sav, .\nicr. Couch, pi. 24. Unio oriens, Lea, Trans. .\mer. I'h. Soc. X. S., vol. iv. pi. fl. f. 5 ; Obs. Unio, vol. i. p. 83. pi. (i. f. .5. llab. Ohio. i garitai/ Lea, in his Synopsis, regards the spec ior side is ig altenn- as a .Mar- (hicJ'/ ivxrj %! Vmcent Bi ooksl)ay i Sou . Imp. U N I LXXV Lea Hah Til low Species 394. (Mus. ILuilcy.) ) FAEULA. Uu. testa farm, obliDiiid-aiiliiiiiailrald, siibiiia'quilaleraU, valMa, dcjircsm, epidcniiii/r Iriinis- siii/d cinpreo-virescente rad/is nHnici'is iii/'cnir onm/d III e.ri'iiiplis peifeclis venlitd, Lcriijald, plir'nt nn/issi- niis panels arcuatis ad wiibows comprcxmis (rrl n-tii- ■la-ij podlce nndata. ; ■marg'me dorxuli aiiln-l- di-cltri, postlce siibdeclivi; exlremitate posticd hlamjithild ; Mar- ijiue veuiraU in medio retiiso, antici accllvi ; area pos- ticd dorsali laid, mngis minusve concavd ; iiatiius ficutis, satis eminentibus ; lumild Incoiispiciid ; inarga- ritd ruhro-anrantid ; deittibus lateralibus mdlis. LITTLE BEAN Unio. Shell Small, squarisli-oblong, scarcely inequilateral, strong, depressed, covered with a peculiarly thin epidermis of greenish ash-colour, adorned with olive rays beneath, smooth, but with a few very coarse arched, transverse folds ou the hinder side of the more or less retuse umbonal region ; dor- sal edge sloping in front, less so behind ; hinder ex- tremity biangulated; ventral margin indented in the middle, rising in front: dorsal posterior area broad, more or less concave ; beaks acute, moderately pro- jecting ; lunule indistinct ; nacre orange-red ; no late- ral teeth. {Margarilana), Trans. Anier. Ph. Soc. vol. vi. (and Obs. Unio, vol. ii. p. 44), pi. 13. f. 39. , Cumberland river, Tennessee, ic njiper angle of the hinder side projects bcynnd the . Tlie iiinder primary tooth of the left valve is A the top. Seems only a form of Ourrcgann. Species 895. (Mus. Hanley.) jNIO deltoideus. Vn. tesld parvd, ra/Idd, snbova/l, ri'u/ricosd (id prceserllm, postlcej, vi.r iinriiHlhilrnili , pallldi li(tm, radiis cvrideo-virldibiin (in „irdn, lalio- ribii.s) pidchre ornald, hrvlgntd, ad iiiiihniu't, iinteiii, pilch nidibus perpaucis (3-3) remolis, coiitliiiils, Iraiisi-crsim undulald ; extremitate posticd obtuse siib- biangulald ; margiiie veutrali vix retitso, aiilice areii- atim acclki ; costd mnbouali lata, rolundald ; natibiis aciilis, satis eminentUjus ; lunuld mdld ; margaritd nlbldd, deutibus lateralibus millis. I'liR tablet Unio. Shell small, strong, suboval, ven- tricose (especially behind), scarcely inequilateral, pale n.shy yellow adorned with liluisli-grceii rays. which are broader in the middle, smooth, except ou the extreme nmbonal region, which has two or three distant, oontinuon?, coarse, transverse folds ; hinder extremity bluntly siil)l)i;iii;;idated ; ventral margin scarcely at all iiidruliil, urcliing upwards behind ; un)bonal ridge broad, niuudcd ; beaks acute, mode- rately projecting; no luiiulc; nacre white; no lateral tcrtli. Lea {JIargarilaiia), Trans, Anier. I'h. Soi'., vol. vi. (and Obs. Unio, vol. ii. p. 43), pi. 13. f. 38. Ilab. OIlio river, near Cincinnati, N. America. In perfect examples there are :i very few small and close longitudinal ridges in front of the beaks. The rays are so broad in the middle as to appear the ground-colour. The likeness to cakeohm is unpleasantly striking ; Lea re- marks, however, that the front lobe of the teeth seems larger in tins, tlie liimlrr one in the allied species; more- over, that is a suialler shell, more flattened, and with its undulations uubrokcii. Species 3'J(5. (.VIus. llanley.) Li.MO SwAINSDN'l. Uii. Ifstii parni, ■•iidldixsiuiil, tiiinidd, ubllqid 0C(dl-cllipHcd. iili-lmine ridiindald, valde liun- quihderaH, ephh'nuidi' tfiml lnti-o-!iidiulinired veslltd, Imujatd, plicis anlfhi piiiiris prrwiii/ius ad iimboues eiiUnenii^s oniiild ; nnn'ifnti' mil rah fvivi'.vo, aidicf ac- clirl; hniidd pruDnnl.i : ,i<,r,j„rlld albldd ; margin,' carduiali hdo; ainl.ilr iiuihoirdi i,r. smoothish, merely sculptured by the grooves of in- crease, ligamcntal edge scarcely sloping, ventral margin rising in front, umbonal ridge tolerably con- spicuous, umbonal slope broad, umbocs moderately projecting, nacre white, hinge-margin very broad, primary teeth triangular and jagged. Lea, Trans. Amcr. Ph. Soc. ser. 2. vol. v. p. 9S (Obs. on Uiiio, vol. i.) pi. 14. f 4L TM. Ohio, N. America. In this species, allied to siibrolitiidiis of Lea, but flatter and darker, the epidermis is somewhat membranaceous. Species 403. (iLis. Ilanley.) Unio excavatus. Un. testd subtrigond, haud rrassii, ralde injtntd, siibaijnilalerali, antice subplicatd angiistd et porrertii, poslice nngidald et IcEvi, nitidissime luted, vel eoiiculure, vel lineis olivaceis siibiiilerriiplis puslirr radiatd, margine venlrali arcuaiu, umlio,nhiis hiii.-'inie eminenlibns, natibus oblii/iiis, costd ninliiuiiili iiiigiilutii. ared poslicd exireind planidatd, ligamenlo breci, mar- garitd albidd, dentibas cardinalibus conico-compressis. dentibiis laleralibus magnis. The hollowed Unio. Shell subtriangular, not thick, nuich swollen, nearly equilateral, narrow projecting and somewhat plicated in front, angular and smooth behind, of a polished dirty yellow, either without variegation or with indistinct somewhat iaterrupteil olive-green linear rays on the hinder side, umboes remarkably prominent, beaks slanting, umbonal ridge angidated, the slope behind it flattened, ligameiil short, nacre whitish, cardinal teeth conic yet coni- jiressed, lateral teeth large. Lea, Obs. on Uido, vol. vi. p. 71. pi. 13. f. 52. Ilab. Georgia and Alabama, N. America. . The hinder profile is heart-shaped, and the radiating concavity behind the umbonal slope leaves, by its indented termination, a decided hiatus. Both primary and lateral teeth are large; the formi-r are double in both valves. Species 404. (Mus. Ilanley.) Unio atrocostatus, L'n. tcsid wngnd, solidd, siibr/ii bed, maxiini incei/iiiluteruli, vcntricosd, oltvaccd c co!ori', pticii prrmagnis roluiidiiti-s toidliiue (iihi aniici) ohl'ujui utidatd, plicis urea dur.wUn podica- ■siin-iiiii diverffeiUidiis, costd umbunali tiulld, luiiuld pnrcd ; vmboiiibus satis emiue/itibjis, nali/ms obliquis. margnrild iilbd, arillce aulem salijinrpn ridesn-Hle , dciitlhns ctirdiiiuUhM magiiis, hiciiiinth. piiriimidiiJihim. TllK BLACK-KIBBED UnIO. Slldl luigr, toliii, sub- rliombic, especially inequilateral, veiitricosc. of an uniform olive colour, everywhere (except in front) obliquely waved by a few very big rounded folds, of which those on the rimbonal slope diverge up- wards, with no umbonal ridge, a small lunule ; uud)oes moderately projecting, beaks slanting, naen- white (becoming however iridr tinged with purple nnteriurly) ; jagged, jjyramidal. Lea, Trans. Amer. Phil, «oc. ser. 2. Obs. vol. iv. ]). 44. Uah. Alabama and Louisiana, X. Am. This is not the species eiToneoush Plate IV., which seems merely lieroi closer to the plicr/l lis of Plate \' . It i from the perplicaiiis as represented ii considered by Conrad to be a syiion (Proe. Philad". vol. i. p. 17). slightl.N eth big. so designated in ,• it comes much perfectly distinct Plate LX., but is m of his species Umc PUMVni. Sowsrbv.clriet lith L BrookB,Day ^ Son Jmp U N I . Pi.ATK lAxvin. SpcncN -tor,. (Mu^. Haiil.N.) iNin DlandiaXUS. U,i. leslii nlu»ihdn.,,,„uh-aUi, xiih- inaqiiilaleraU, teniricosic, in medio rm/ia//,,/ i-viicnni, liavo-oUvaced concolore, costd iimboiKili 11111^^11,1(1 um- iiilii, coiicentrice rude suhplicald, auticP H in areain jioxficai,! dorsalm laiam el concavam vernicis com- pn'ssi.i Innje ornuld, mimjiue vmtrali iiicurvntn, mar- ffine dorsali podico vix decUn, umbonibm emineiilibiis, margarita albd; denlibus cardinalibiis maf/ids, laci- viatis, pp-amidalibus. IiLand's Unio. Shell rotundately square, not very in- equilateral, ventricose, with a ray-like hollow in the middle, of an uniform yellowish-olive, with a pecu- liarly broad umboual ridge, coarsely subplicated cou- Cfutrically, ])rofusely adorned in front and upon the liroad and concave uuibonal slope with pinched, wait-bke knobs, ventral edge incurved, hinder dor- sal edge scarcely sloping, umboes prominent, nacre white; cardinal teeth big, jagged, pyramidal. Lea, Journ. Ac. M. S., Philad. ser. 2. vol. iv. (and Obs. on Unio, vol. vi. p. 65), pi. 11. f 47. Hub. Coosa river, Alabama, and Othcalooga Creek, Georgia, N. America. The posterior tubercles are an'anged in more or less ri'gular curved diverging rows. The stages of growth arc close and subpliciform. Species 406. (Mus. Hanley.) ^Nlo TuoosTENSIS. Un. testd parvd, validd, vel subob- liqiie orald, vel obhngd, valde iniBqidlakndi, anticit subbiangulald, siibvenlricosd, lavi, olivaced, liueis con- feiii'i drigiaque aiiguslis saturalioribus undique (minun iiiilriii iiiilice, el nomtunquam obscuHsj radinld, mar- (jiiii- i-eutruli subi-eluso, et antice acclivi, and posited dorsiili coiicavd, umbonibus satis emiHentibus, litimld profundi excavatd, margarild albd, denlibm cardina- libiis mngnis, InciniaUs, Iriyonis. 'uoost's Unio. Shell small, strong, either somewhat ob- lii|nely ovate, or oblong, very inequilateral, subbiangu- latcd in front, somewhat ventricose, smooth, olive, cveiywlirre (less in front, and at times indistinctly) rayed with darker narrow streaks and crowded lines ; ventral margin somewhat indented, rising in front, uud)onal slope concave, umboes moderately prominent. i|ily ( xcavated, nacre white, primary teeth Lka, Trans. Amer. Phil. Soc. ser. 2. vol. v. (and Obs. on Unio, vol. i.), p. 71. pi- 10. f. 30. Uniu Irabu lis. Conrad. Hab. Cinuberlaiidri\er. X. America. It was impossible for Conrad to detect in the elongated male exanipli' delineated by Lea, his obliipiely ovate Ira- balis. These sexual distinctions (which are not salient in other shells) are a source of continual difhculty in the American Naiades. The species is quite distinct from the one erroneously so termed in Plate XXXVIll. Species 407. (Mus. Hanley.) Unio striatus. Un. lesld parvd, solidiusculd, nilidd, ovuli, postice rolundnto-subbiangulatd, vix subeenlri- cosd,Jlavo-si(boUmced concolore, concentrice subslriald, margine venlrali convexo. cosld nmbonali inconspicud, Innnld nnlld, nalibiis vix eMiuenHbus, margarild ciipred, denlibiis cardinalibiis lacinialis, subpi/ramida- libiis. The striated Unio. Shell small, rather strong, glossy, oval, rotundately subbiangulated behind, barely sub- ventrieose, of an uniform somewhat olivaceous yel- low, concentrically substriated ; ventral edge convex, umbonal ridge inconspicuous, no lumde, beaks scarcely projecting, nacre copper-coloured ; primary teeth jagged and somewhat pyramidal. Lea, Trans. Amer. Phil. Soc, ser. 2. vol. viii. (and Obs. on Unio, vol. iii. p. 41), pi. 12. f. 16. Hab. Chattahoochie river. Columbus, Georgia, N. Ame- Species 408. (Mus. Hanley.) Unio nicer. Un. lesld ovalo-acuminald, solidissimd, satis ventricosd, subolimced, obscure radiuld, lamgatd, postice cuneifonni, margine dorsali antico convexo, satisqiw declivi ; margine venlrali convexo, vix minime reluso, antice arciialiin acclioi, cosld nmbonali anyit- hitd, area poslicd planulatd, umhonihus talis, limuld vuignd. excavatd, margarild albido-livescenle, margine curdinnli lato, dentibus cardinalibiis pgramidalibiis, denlihns luleralibiis criissis. The black Unio. Shell peaked ovate, very solid, mo- UN 10.— Plate LXXVII] (leratt'ly ventricose, somewhat olive-coloured, indis- tinctly rayed, smootli, wedge-shaped behind, I'roiit dorsal edge convex and moderately sloping ; ventral edge convex, scarcely in the least indented, arching upwards in front, umbonal ridge angulated, hinder area flattened, umboes broad, liuiule large and exca- vated, nacre livid white, hinge margin broad, car- dinal teeth pyramidal, lateral teeth thick. Conrad (as of Eaf.), Mon. p. 49. pi. 20. Hnb. Michigan, etc., N. America. According to Lea, this is identical with the criissiJens of Lamarck ; it is necessary, at all events, to delineate a shell wiiich bears no resemblance to our figure of that species. Species 409. (Mus. Ilanley.) Unio consangdineus. Un. tedd parvd, maxinie iiiaqid- laleraU, ovato-elongatd, atdice solidd veidrkond el truncatd, postici tenui gradatim depressd d suhat- tenuald, luted concolore, lavigatd, could umbonnli nulla, hinuld salts magna et excavatd, margbie cardi- nali lalissimd, denlibiis cardinaUbus pp-amidalihus, sulcalo-lacinialis. The kindred Unio. Shell small, extremely inequila- teral, elongated-ovate, in front solid ventricose and truncated, behind thin, gradually depressed and somewhat tapering, of an uniform dirty yellow ; with- out umbonal ridge ; lunule tolerably large and exca- vated, hinge-margin very broad, primary teeth pyra- midal, jagged and grooved. Lea, Proc. Ac. K S., Philad. 18IU, p. GO ; Obs. on Unio, vol. viii. p. 71.pl. 7. f. 317. Hab. Alabama and Georgia, N. America. A heavy little shell, closely allied to decisiis and its allies, yet clearly distinct. It is cuneiform in convexity, has the valves peculiarly shallow, and the muscular scars pre-eminently impressed. The teeth of the left valve being large and almost united at their origin, leave a peculiarl\ shaped undivided and capacious receptacle for thein in the opposite hinge. The umboes of adult examples are almost invariably eroded. tongd, liiiiid pecidiari/er inaijiiilater/ili, valldd, sub- venlricoxd, Uni, olicari'U (scu sordide viridij, radik oiigmlis pa/lldioribus undiqua ornatd, margbie ven- Iruli vix iidnbiu: retuso, cosld nmbounli iticonspieud, lunula nullu, umboiiihus satis eminetdibus el plicis ptiucis oblitjuc uiidulalis, margarUa albido-carules- canle, deidibns latcrullbus nullis, deulc cardbiali in valvulu dexlrd coidco-lriangulari, dnde curd'iunti an- tico in valmdd sbtislrd postico iiwjorc. The pebble Unio. Shell small, ovate or ovate-oblong, not especially inequilateral, strong, subventricose, smooth, olive (or dirty green), with very pale narrow rays over its entii-e surface, ventral margin scarcely at all indented, umbonal ridge not marked, no lunule, the moderately prominent umboes wav6d with a few slanting folds, nacre bluish-white, no lateral teeth, primary tooth in the right valve conic-triangular, front one in the left valve larger than the hinder. Lea, Trans. Amer. Ph. Soo. vol. iii. (and Obs. on l^nio, vol. i. p. 7), pi. 3. f. 1. .Ilasiiiodunlu Iruncata, Conr. not Say (teste Lea). Hab. Ohio. Suspiciously close to the less triangular forms of del- loidea, although adult examples can readily be discrimi- nated. Lea points out that in the allied species it is the Species 410. (Mus. Ilanley.) Uxio calceola. Un. testa pared, orald, vel ovato-ob- Speeies411. (Mus. Hanley.) Unio coevus. Uh. Icsid parvd, crassiusculd, suhocali, poslice sMuaigulald, vi^ subventricosd, fused conco- lore, nisi supra costam uuiboualem subangulatam sub- hccigald ; ared dorsali posticd Ibis obliquis supeme sparsbn corrugatd, umbonibus erosis, hand embienti- bus, margardd ulhidd, dentibus cardbialibus mognis, couico-lrinngularibus. The crow Unio. Shell small, thickish, somewhat oval, subbiangulated behind, scarcely even subventricose, of an uniform dark brown, almost smooth, except be- yond the somewhat angular umbonal ridge, behind which there are a few slanting raised wrinkles near the beaks; umboes eroded, not projecting; nacre whitish, primary teeth large, conic-triangular. Lea, .Jouru. Ac. N. S., Philad. ser. 3. (and Obs. on Unio, vol. vii. p. 35), pi. 27. f. 97. Hab. Georgia, N. America. UmoPUmi. Sowsrby.dfiletlith %centBrodks,Day&Soii,Imp U N I 0. Plati; LXXIX. Species 413. (Mus. Hauley.) Unio occatvs. [7/. tedd parvd, ieniniisculd, (kpressiiis- cnkl, ovnU-suhqiinrlrald, anlici OMjustatd, postice di- hitatd et subbiatujuMd, paUidi viridi, liris variis vi/tUis, oilifjiiis subgrnnosk dicertjmtibtis siiperiie cor- riigntii, anlice prd,;dlrald, margine venlrati ret/ISO, margine durs/i/i portico mngis miniisve acclivi. nred poslicd dorsali crmrard, Iniinld pnrrd, snlin air. tern conspicnd, iimbonibiis emiiienlilnis, iinlihux coneeii- trice ii>idalo-j)licalis, margnrild alliidd, dentibus car- di/ialib/is satis magt/is. Sandri's Unio. Shell small, either ovate-oblong thick- ish and posteriorly ventricose, or more elongated thin and less ventricose, of an uniform olivaceous yellow, not painted with green at the umbonal ridge, smoothish, merely subplicated by coarse wriid\Ies of increase ; ventral edge indented, hinder dorsal edge more or less elevated, hinder dorsal area concave, lunule small, yet tolerably distinct, umboes promi- nent, beaks with concentric wavy folds, nacre whit- ish, cardinal teeth tolerably large. Villa, in llossmiissl. Icon. L. und S. Moll. pt. 13. p. 20. pi. 51;. f. 748, 749. Ilab. Dalmatia. However dissimilar in iispect, this shell runs by almost imperceptible degrees into elongatulns and Re(iiiieiii. 4'hi; shorter form delineated is the var. sericata, which is fur- thest removed from the allied species. The front dorsal corner in the more characteristic specimens is apt to pro- ject in an angular manner. Species 414. (Mus. Ilanley.) Unio Bonellii. Uh. lesld tenni. siibotdii/Hr oUougd, s,r- piiis suLarcuald, valde hirequitateruli. deprrxsii, imtire angnsld, postice prodiicld, otiriieeii, lunid nntnild. trevi, margine reiitrali m.:gis ,.,u,.,srr r.-le^n, m.ld nnilioiudi ptanetntd. tiniehl mige^t.i : „..,t.u,iilu'-< Imnd eiiiiiienlibns, pticis angiistis irregiitnrtbns ad e.iiremi- lates siiblramversim. iiiididatis ; inargoritd alhidd, denle nnico con/pressn in iitrdgiie ralviild, dentibus Isleralibus unllis. BoNELLl's Unio. Shell thin, sumewliat ()l)li(pu4y (ililimg, usually subarcuated, very inccpulateral, ilcprej-siil, rayed, smootli, willi a more or k->s imifulfd ventral niarsiin. a IIiiilumI ninbonal ridge, and a narrow hi- nule; uuiIhiiv uhI [Udniineut, somewhat transversely waved at llnir 1 \tri'niities by irregular narrow folds, nacre wliili>li, a single compressed tooth in each valve, no lateral teeth. July, ISfiS. UNIO. Ferussac, in Rossmiissl. Icon. ]j. iind S. IMoll. ]it. 2. p. 24. f. 134. U„io tiepressa, Mulilf.-l.lt. AInsniodoida comjirfsm, ileiike. IMj. lllyi-ia. A full-sized e-tample has been figured, with the margin less incurved than usual. The valves have a tendency to liecome g-reeu at their hinder e.\.treraitics, and the minute folds to be disposed in two series. I.ATE LXXIX. ini'ented, rising in front, unibonal ridge inconspi- cuous, lunule undeveloped, umboes scarcely project- ing, nacre dirty whitisii, primary teeth jagged and subtriangular. Lea, Trans. Amer. Phil. Soc, ser. 2. vol. viii. (Obs. on Unio, vol. iii. p. 38j, pi. 10. f. 12. ITai. Holston river, Tennessee, N. America. Although the characters are merely negative, the species can generally be recognized. Sp, 415. l,:\Ius. Hanlev.) Figure 415, «hieh represents the male of U. Trons- terisis (Plate LXXVllL), liaving inadvertently been num- bered as though distinct, it lias been thought preferable to consider that Species 415 represents one of those shells (such as the pen/ij; of Phite XVIII.) which were erroneously determined in the earlier portion of this mo- nograph, rather than create further confusion by changing the priuted-off references to no less than six lithographs. Species 416. (Mus. Hanley.) Unio aMCENUS. Uh.. testa pand, crassiuscida, sitbcentri- cosd, suhiitcEqu'daterali, ovali, postice lavi et vix -iiii- Inani/ulcdd, mtiild, squnUd'e Jlavd, radiis ollvaceis iii- lerntplis undique fpo-itice aiitem coi/fertius) oniatd, autice snbrugosd et minus pictd ; maiy'me veiitrcdi siibretuxo antici acclki, costd umboiiaH iiiconspiciid, liintdd vix ulld, timbonibus vi.v I'mineidibiis, mnrgnritd squalide albidd, Jeidibns cardiiiulibii-< ■■subtriijiti- latenili, iiiriiKiite et iiiferne rolniijiitd, mngis miiiiisve vetitricom, flavo-olwaced, pos/ice rn/liis subcoiifcrtis viridiljiis onia/ci, laviijald, margine dorsali. posfjce vix declivi, cosld uinhonaU inconKpicud, himild nulld, nm- hohiljns paulidum i-miiientiliiis, margariid alio-Uves- ceale, dentibus cardiiiaU/iits Imninalin, laciiuatis. The deceptive Unio. Shell small, tliiii, oval, not very inequilateral, rouiidecl below and at each extremity, more or less veiitricose, yellowish olive, posteriorly with rather crowded green rays, hinder dorsal edge scarcely slojiing, umbonal ridge not manifest, no liinule, umboes slightly prominent, nacre livid white, ]iriuiiiry teeth jagged and lamellar. Lea, .lourn. Ac. N. S. Philad. ser. 3. vol. iv. (Obs. on Unio, vol. vi. p. 79), pi. 1.5. f. :>iiiblo)igis, cras-iis, sub- arcuatis. t'oucu's Unio. Shell squarish, inflated, thick, inecpii- lateral, rounded in front, bianjTulated behind, smooth, of an uniform olive-browu, with a ray-like hollow before the broad and angular uraboiial ridge, flat- tened and with conspicuous slanting grooves behind it ; ventral edge arched in front, emarginated be- hind ; nacre vvliitish ; primary teeth rather large, erect, rugosely striated, crenulated ; lateral teeth somewhat long, thick, rather curved. LfcA, Proc. Ac. N. S. Philad. 1S60, p. 305; Obs. on Unio, vol. viii. p. 53. pi. 06. f. 196. Hub. Eio Salado, New Leon, Mexico. The contrast between the coarse fold-like appearance of the broad flat posterior dorsal slope and the general smoothness is very striking. Species 430. (Copied from Lea.) Unio Popei. Un. testa elongatd, xubtenui, depresm-ci/- I'mdraced, ivferne return, antice angustd et porrectd, postici^ proditctd et subtrtmcato-biangnlatd, fused ant olivaced, obsolete radlatd, Irgvignfd; uatibics pai'vis, proiiiiiinlii, ad apices granidatis, margarita albd, mnniinqiimn paUidi aurantio-rubrd ; dentibM cardi- nalibtis compressis, erectis, aciiminatis, cretiidatis ; derdibas lateralibus prcelongis, lamellatis, suhrectis. Pope's Unio. Shell elongated, depressed-cylindrace- ous, indented ventrally, narrow and projecting in front, produced and subtruncately bianguiated be- hind, brown or olive, with indistinct rays, smooth ; beaks small, rather prominent, granulated at the tips ; nacre white, sometimes salmon-coloured ; pri- maiy teeth compressed, erect, acuminate, crenulated ; lateral teetli very long, lamellar, nearly straight. Lea, Obs. oq Unio, vol. viii. (Journ. Ac. N. S. Philad. ser. 2. vol. iv.), p. 54. pi. 60. f. 197. Hnb. Texas, and New Leon in Mexico. Lea remarks that the posterior slope is raised iuto a carina, and is rayed with two impressed lines. Unw PI.LXXXII. Vinrent Brooks.Da-y&.Son Imp U N I 0. I'la Species 431. (Mus. Lea.) Unio Higginsii. Un. testa nuKjnd, tmii.idd, percraisn, valde liKfqitUati'rali, inboltt'iiiiie ovali, aiitice angiis- tatd, postia' rotiinilnid, livri, politu, olivaceo-virente, muUirad'mtd, marijnn' i-i-iilruli roiwexo, coatd uitiboiiaH rotmidatd ; ared /jos/icii n/ni/i/d, cordatd, aiibplnuii- latd ; nmboHibus valde emmeutibKS, tinnidii, iiiriirim- tis ; Imudd parvd, distinctd ; manjaritd iilbil, aiit pallide aurantio-rnbrd ; margine cardinali lata ; den- tibits card ilia lib /IS nmgnis, crams, erectin, creiiidatis ; dentibm lateralihits percrassis, s/ibrectis. HiGGiNs's Unio. Shell large, swollen, very thick, very inequilateral, somewhat obliquely oval, narrowed in front, rounded behind, smooth, polished, greenish olive with many rays ; ventral margin convex, um- bonal ridge rounded ; hinder area large, cordate, somewliat flattened ; nmboes very prominent, swollen, incurved; lunule small, distinct; nacre wliite or salmon-coloured ; hinge-margin broad ; primai-y teeth large, thick, erect, crenulated ; lateral teeth very thick, slraightish. Le.\, Proc. Ac. N. S. Philad. 186U; Obs. on Unio, vol. ix. p. 10. pi. 2-1. f. 3.58. Hub. .Muscatine, Iowa, N. America. Reminds one of Ugameidiiuis, but is less elliptical ; of ellipsis, but is more polished and fuller of greenish rays ; tif orbici/hitiis, but is more inflated, has more rays, and a greener epidermis. There are three indistinct raised lines running along the hinder area. Species 432. (Mus. Lea.) Unio decusibens. Uh. testd iixei/ni lateral i, tenni, eloii- gato-oblongd, arciiatd, depresm, niitice angustatd, pos- tice biangidatd, fiisco-subriifesceiite, obsolete siibra- diatd, tiEvi ; margine ligamenluU ciirvato, elevato, ■margine reiitrali lalissime retuso ; costd mnbonall hiimili, obtiisi angnlatd ; ared posticd nngustd ; um- liDiiiliiis proiiiinidis ; margaritd subpnrpnred ; deiiti- biis cardi/udibns pai'vis subtransversis ; deidibi/s late- ridibiis arciialis. The lying-down Unto. Shell inequilateral, thin, elon- gated-oblong, arched, depressed, narrowed in front, biangulated behind, of a somewhat red dark brown, | with uidistuict rays, smooth ; ligiunent mnrgui curved and raised, ventral margin very broadly indented ; urabonal ridge low, bluntly angulated ; hinder area narrow, umboes slightly raised, nacre purplish, pri- mary teeth small and somewhat transverse, latenl teeth arched. Lea, Proc. Ac. N. S. Philad. ISGl, p. 40 ; Ohs. on Uuio. vol. viii. p. 91. pi. 12. f. 236. Hab. Alabama, N. America. Reminds one, says Lea, of percoarctatns, but ditt'ers in shape and dentition, the primary teeth in the latter being nearly perpendicular to the basal margin. The lateral teeth are stated to be much elongated. Species 433. (Mus. Lea.) Unio Alabajiensis. Uh. testa oblongd, ventricosd, cras- siiisc/ild, SHbiufeqidlatcrali, postici; obtuse biangidatd, olivaceo-lidi'sceide coiicalore, inlidd, la'tigatd, margine reiitrali aidice acclivi ; iiatibin promiiiidis, ad apices riii/oso-imdiilatis ; costd iimbuiiali iiijiatd, rultiiidaid ,• margaritd albidd, siiperm pallide aiiraiitio-riibrd; deii- libiis eardinalibiis parvis, snberectis ; deiilibiis latera- libiis iiidlis. The Alabama Unio. Shell oblong, veiitrieose, thickisii, not so very iiie([uilateral, bluntly biangulated behind, of a luiiform glossy yellowish olive, smooth ; ventral edge rising in front; beaks a little projecting, ru- gosely undulated at the tips ; umbonal ridge inflated, rounded ; nacre whitish, salinon-coloured above ; primary teeth small, somewhat erect; no lateral Lea {.Margarilaiia), I'roc. Ac. N. S. Philad. ISGl, p. 41 Obs. ou Uuio, vol. viii. p. 108. pi. IG. f. 249. Hab. Talladega Creek, Alabama. Allied, says Lea, who drew up his description from single specimen, to SpiUmannii, \m\. dilfeis in colour, less inflated, and rather more oblicpie ; its undulation are, also, more concentric. Species 434. (Mas. Lea.) Unio Wardii. Un. testd U. metanevero «(>«(////««, W July, 1868. UNIO.— Plate LXXXII. Magk depressd el rostd nmhoiiali tiibercidoriim ex- perle. Ward's Unio. Shell extremely like JJ. melanever, but more depressed, and with its iiinboiial ridge devoid of (the characteristic) tubercles. l.EA, Proc. Ac. N. S. Philad. 1861, p. 392: Obs. on Unio, vol. ix. p. 9. pi. 24. f. 257. Hnh. Ohio, Iowa, and A'irginia, N. America. A somewhat doubtful species, but worth figuring, from its great dissimilarity to the ordinary examples of vieta- Species 435. (Mus. Lea.) lo Spjllmannii. Vn. testa magna, subaqidlateraU, iiibcrasm, irijlatd, oblongd, anlice porrectd et angmle rnimidatd, postiee sitbbiangidatd, mlidd, Icer'ujuld, fiisco-rnfesceide, vel fiisco-nigresceute, obsolete railicitd, iiinrglne venlrali hand retuso ,- casta iimbonaU rotiiii- datu, emineute ; limnld vel angustd, vel nulla, vmbo- nibus eiuinenllbiis, ad apices nigoso-undulaiis ; mar- garitd alba; dentibus cardinalibus parvis, tubercu- lato-coiii/jressii, in utrdque valvuld singulis ; denlib/m lateralibiis nidlis. Spillman's Unio. Shell large, subequilateral, thickish, swollen, oblong, projecting and narrowly rounded in front, almost biangular behind, smooth, shining, from reddish to very dark brown, obscurely rayed, not indented at the ventral margin ; umbonal ridge rounded and prominent ; lunule, if any, narrow ; umboes projecting, rugosely undulated at the tips ; nacre white ; primary teeth small, compressed-tuber- cular, one in each valve ; no lateral teeth. Lea (Margarita, I a), Proc. Ac. N. S. Philad. 1858, p. 138; Obs. on Unio, vol. viii. p. 109. pi. 17. f. 252. Ilab. Tombighee river, Mississippi. The hinder slope has two raised lii l)eak.s. running from the FraoF/.LXXXIIf. rhy, del et, lidi Vmcyitt Broote, Day fcSon.l U N I . Tlatf, LXXXIU. Species 430. (Mus. Lea.) Umo cixNAMOminus, Till, iesid parvd, siilivi'jilricosn. crasm, iiueijiiila/ern/i, ovali, postici Kuhl'ianynhiid, Itevi cinnamoiiicd concolore, maryiiii: ventrali cnnvcxo, costn mnhonal'i hicunsp'iaid, inuhoniliiis jiromii/idis. Iii- iiuldviiUd; ,iiar;i„rild nll/nld : dnililjiis rnrd'nialiliits crcc/is, creiiiiliitii, dnilihn^ l,il,-n,libi(.. Shell depressed, thickish, I neaily e(|"ilairr:il, clniigated-oval, projecting and I rounded in front, ooniewhat tapering and subangn- I lar bi'hiiiil. 'luoothisli. dirty yellow; ventral edge arclifd ; umbonal ridge somewhat angular, not con- spicuous; no Innule, hinder slope narrow, mnboes moderately prominent anil minutely grained at their extremities, nacre whitish ; primary teeth big, erect, Lea, Proc. Ac. X. S. P nlad. 1859. p. 154; Obs. c Unio, vol. ix. p. 15. pi. :3G. f. 36^\ /[,ib. RutersvQle, Texas, Described by Lea («di ) remark^ that there may po sihly be rays in better ex mples) from two odd valves, t Telliiioid shape of which cudcrs thcni very peculiar. Species 438. ("Mas. Newcomb.) Umo aureus. I'li. tesld pared, mibiii/equUalernll, •nib- qniidratd, erasaiiisciild, s/ibdejiresnd. an red, liPi-'ujula : cosld innboiiali ri.v proiiiiiiidd, ralitiidatd ; hniidd an- ijiixtd, umboidbiis Hath eiiiiiieidibiis. inanjiiritd albii ; deiitibiis cardiiiatibas ereelis. Klrhitis ; deiitdiiis lalera- fibnii brevibiis. obliqai.^. The oolden Uxio. Shell small, somewhat inequila- teral, sqnarish, thickish, somewhat depressed, golden- yellow, smooth; >nnbonal ridge scarcely rai^ed, ronndcd ; Innule narrow, undines tolerably promi- nent, nacre w hitc, primary teetli erect and striated, lateral tcctli smooth and slanting. Lea, I'roc. Ac. N. S. Philad. is,",!), p, 11;.> ; Obs, on I'nio, vol, ix. p. 17. |)I. -^G, f ii\A. ILih. Tcxa^. Alli.Ml lu r,d„;,i,io^,i, and petriiii,^. It has a few Muali indistinct rays and rather distant marks of growth. Species 43!). (Mus, Smithsonian Institution,) I'nio NODULOSUS. Uu. lestd ralde obliqnd, perxotida. iiiaijh miiiiisve ceiitricosd, maxime iiireqinlaterali, an- liee tritncatd, fused, liihercidis pergrnndibns el jjoslice jdieis paiic'iK lalissiiiiis oriiid'l. iiiiiininibiis emii/eiitibiis, I'-niiiiialibiif:, moraardd alba; inarijiiie cardinatila- Imaiio, dentdjHx cardinalibiix in idrdqae enlndd dii- plicibiis, SiTpias rude siiteati.s. liand Iraiisrersix : den- I'lbiia lateralibifi lomjh. The nodulous Unio. Shell very oblique, very bolid, more or less ventricose. remarkably iiieqnilateial. truncated in front, dark brown ; snrfaee ailorned with very large tubercles, ;uk1 on the hinder slope with a few very broad folds, umboes prominent and terminal, nacre wliltc, liiiii;v-maigiii excessively broad; grooveil, not transverse ; lateral teeth elongated. Wood {_Mya), General Conch, p. 100. pi. 23. f. 1 to 4. Uido (jraiidideiis. Lea, Obs. on Uiuo, vol. ix. p. ~'7, pi, 30, f '271, //,///, Hot -.priiigs Arkansas X, .Vmerica (t.ste LeaJ. Tlie aspect is more that of a C;hine>e than a X. American Uido. Lea considers his own species distinct from Wood's ; both may prove to be the Clinnm plitnibeii of Chemnitz (Conch. Cab, vol, xi. f. 1991, 1992). The U. nodidosas of Plate IX, is merely the Leeid of Gray (Griffith's ed. ('uvi<'r. AIol. pi, 21, f 1.), a comparatively common shell. •Inlv, 18G8. UNIO.— Plate LXXXIU. Specips 440. (Mn>. I,™.) UnIO COXCOLOR. I'll. Irshi' sii!i-l I iiilirii . iiiirqiiihiti'riili , cnisiiii^riild, siihmilnvuxd. n/iriiccii-iiii/rexcrH/f coiico- tore, Ifenigaln ; rosld iiiiiljonnU vi.j: jjiviiiiiiu/ci, ohtii- ■ussime migulatd ; muri/ariiu ullid ; daidibus cardiim- libiis crusniuscidis, crniis, uhtnxi ruiiipreish ; dcillibiis hlleralUlM Xldjlinnjlx. nhlhi'iis, M'/,/; r/i\. The one-tinted L'mh. sIk 11 -oimu li,it I'liipiic, iii- ('([uilatfral, tliirki-li, M>iiiL'«li;a vcnlricobi.-, of a uiii- f'onii ilu-kv olivc colour, snionlli; mubonal rk\'j:e til .-^oii scarcely pr white ; prii pressed ; hi straiu'iit. Lea, Proc. Ae. X. S. Phihul IJriio, vol viii. p. 1)3. j.l, JM. Big Prairie Creek, AhilK, Lea remarks that tiiis shell. ovatiis of Courm]. has the oull Bnn„l,,/aiii,s. aii.l rciiiili.ls uiu- and has the beaks less raised, ect, obtusely eoiii- iig, obli(|iie, nearly 1 for the ppr- the colour, u\ il.-o ol ul uior Species 44L (Mus. Lea.) Unio IIeermanm. J'ii. feild siMenui, de/iressa, iiiaqiii- taferali, iirin'i--,i'l,'jiii'ilratd, puntki siibhiangidatn, ni- tidd,fiiscu-/iiicsccicU' concolore, Icevi ; casta nmbonaU prominuUi, roluridald, wfenie lain ; inarghie Viija- mentali acclivi, Inmild ant nnlld ant aitgustkshiiii ; maryarild nilidmimd, pnrpnraiin'nlc, snpenti', antcni, palcide aitrontio-ritbrd ; dinlibim ca/'i/iiwlibns snb- coidcis, creunlulis. Heeumak's I'nio. Shell thinnish, depressed, ineiiuila- teral. siiuarish oval, somewhat biaiigidated behind, of a uniform glossy yellowish-brown, smooth ; um- bonal ridge rounded, little projecting, broad at its termination ; ligauieutal edge rising, lunule cither none or very iiarrou', nncre of a very brilliaiit pur- plish hue, yet s.ihuou-coloured in the \unljonal ca- vity; primary tcetli somewhat conical, crcnulated. Lea, Proc. Ac. k. S. Pliilad. 18(il, p. 39;i ; Obs. on luio, vol. ix. p. 16. pi. SG. f. 2(53. TLab. Medina river, Texas. 442. (Mus. Forshey.) () RlDUELIJ /iiiid,ilu-si>/u Vil. hst.i par ilidd, injiatd, ro- Inilii. rr.ldf iiurqiiitnhrali, f'lsco-oli- i-aili(il((. Iiiri ; niiirij'nii' venlrali area- alii, ciisid iiiiiliiiiKili iiiiiiiiliitii (-/ coiisjiiciid, hiHiild iinllii, niiibuilihiia raldr ciiiiiinilibn.'i ; tiiitibns iiihutli i-l roiifvrtiin plicati.% inanjnritd nlbd, drnlibn-s ciird'i- naVibuH sidipi/nnnldulibiis, deiilibns lateralibns hilis. rurnujalh. Riddell's Unio. Shell small, solid, inflated, squarish- rounded, very inequilateral, olive-brown, indistinctly rayed, smooth ; ventral edge arched, umbonal ridge conspicuous and aiii;ular, no lunule, luuboes very prominent, beak^ uilh minute and crowded folds, nacre white, primary teeth subpyramidal, lateral teeth broad and wrinkled. Lea, Proc. Ac. N. S. Philad. ISfil, p. 392; Obs. on Unio, vol. ix. p. ;;o. pi. 27. f. 207. Ilab. Dallas in TeNa<. Deseril.e, single, but p. rfect i u,uc n. Ljxxiv Sbwerby 'iel et.ii'}i ■VmcentBrooks DayfeSon, Imp U N I 0. Plate LXXXIV. Species 443. (Mas. Lea.) Unio per.eformis. Uii. testa cramuscidd, satis veiitri- cosd, Hidjincequilulerali, oblique oliovatd, su/jlavigata, viridi-nigresceulfi, hand radiatd ; wanjine Vujamentali acclini ; casta umbonali subrotundatd obtuse subanyu- lata, margaritd alba ; dentibus cardiiiatibus hand mai/nis, compressis, crenulatis. The podch-shaped Unio. Shell tliickish, moderately ventricose, somewhat inequilateral, obliquely obovate, smoothisli, dusky gTeen, not rayed ; ligamental edge rising ; urabonal ridge roundish, bluntly subangu- lated ; nacre white ; primary teeth not large, com- pressed, erenulated. Lea, Obs. on Unio, vol. x. p. ^'0. pi. 43. f. 292. Hab. Urugtiay. There are imperfect irregular undulations along the angle of the hinder slope ; these, however, may not be persistent. Species 444. (From Lea.) Unio gratus. Un. testa crassiusculd, subventricosd, in- feqiiiloterali, postice dilatatd, satiiratiiis oUvaceo- fiiscd, sublamgatu ; margine veutrali convexo ; margiiie liganientali aeclivi ; costd umbonali subinjlatd et ro- tund atd ; lunuld vix ulld ; jiatibus plicii brevibus ra- dintis ; margaritd albd ; deutibus cardiualibus sub- transversis ; deutibus lateralibus elongatis. The agreeable Unio. Shell thickish, subventricose, inequilateral, dilated behind, very dark olive-brown, smoothish ; ventral margin convex ; ligamental edge rising ; umbonal ridge somewhat swollen and round- ed ; scarcely any lunnle ; beaks rayed with short folds; nacre white; primary teeth somewhat trans- verse ; lateral teeth elongated. Lea. Obs. on Unio, vol. x. p. 18. pi. 43. f. 290. Hab. Uruguav, S. America. Species 445. (Copied from Lea.) Uxui PIGER. Vu. testa subtenui, ventricosd, subimrqui laterali, oboratd, postice latd et subbiaiigulatd, fusco uigresceute, obsolete subradiutd, larigatd ; costd urn bonali rotuudutd, emineute ; area postied latd, obscur sulcidn ; liiuiild angnstd ; margaritd albd; deulibiis cardinatHius compressis, laiiiellaribus, crenulatis ; deu- tibus lateralibus longis et postice curvatis. The fat Unio. Shell thiunish, ventricose, somewhat inequilateral, obovate, broad and subbiangular be- hind, dusky brown, at most indistinctly rayed, smooth ; umbonal ridge raised and rounded ; hinder slope broad and obscurely grooved, lunule narrow, nacre white ; primary teeth compressed, lamellar, erenulated ; lateral teeth long, curved at the end. Lea, Obs. on Unio, vol. x. ]). 23. pi. 27. f. 295. Ifab. Uruguay. Allied to Uruguayensis, but smaller, rather rounder and with a darker and less shining epidermis. There are ves- tiges of divergently radiating folds on the eroded umboes. Species 440. (Copied from Lea.) Unmo Gesnerii. Un. testd subaquilaterali, crassiusculd. in/atd, ovali-subquadratd, postice biangulatd, nitidd, concentrice sulcatd,fusco-nigrescente, obscure radiatd; costd umbonali conspicud, obtuse angulatd ; lunula iii- couspiciiii ; margaritd albd, srepius niargine subpur- pureo ; (hnldjiis cardinalihus parvis, subtransversis, subcomjircxsis, in utrdque valculd singulis ; deutibus lateralibus nullis. Gesner's LfNio. Shell nearly equilateral, thickish, swollen, squarish-oval, biangulated behind, glossy, concentrically grooved, blackish -brown, indistinctly rayed ; umbonal ridge conspicuous, bluntly angular ; lunule scarcely evident; nacre white, usually bor- dered with purplish ; primary teeth small, somewhat transverse, somewhat compressed, one only in each valve ; no lateral teeth. Lea (Margarifana), Proc. Ac. N.S. Philad. 1858, p. 138 ; Obs. on Unio, vol. ix. p. 33. pi. 32. f. 280. Hab. Alabama and Georgia, N. America. Species 447. (Mus. Lea.) Unio speciosis. I'n. testd depressd, crassiusculd, sub- quadrato-obovuli, snbaquilaterali, postice biangulatd, midique tuierculis minutis subgranulatd (grants su- pra costani untbonalem obtuse angulatum subliuean- UNIO.— Plate LXXXIV. bus, et ill seriebus curvatis confertim ordinatis) luteo- virescenle, aiit concolore, aid obscure radiald; mar- gine venfrali retitso, lunula, aid nulla, aid perjmrvd, viargardd alba, dentibus canUnalibus subtriijoiiis, slriatis ; dentibus lateralibiis rectis. The seemly Unio. Shell depressed, thickish, squarisli oboval, nearly equilateral, biangulated behind, every- where subgranulated by minute tubercles (which, beyond the bluntly angular umboual ridge, become linear, and are disposed in curved and crowded parallel rows), greenish-yellow, at most indistinctly rayed ; ventral edge indented, lunule either raiiuite or none, nacre white, primary teeth subtriangular, striated ; lateral teeth straight. Lea, Proc. Ac.N. S. Philad. 1862, p. 168 ; Obs. on Unio, vol. ix. p. 29. pi. 31. f. 276. Hnb. Texas. Very like Foiskei/i, but with much smaller tubercles, and more depressed and quadrate form. The sculpture reminds one of Say's apiculatiis. Species 448. (Copied from Lea.) Unio Uruguayensis. Un. testa crassiiisculd, iiijlutd, obovali, postice biangulaid, subceguilafei-ali, politd, idrinqne coiicentnce subsulcatd, in medio lavi, viridi- fuscd, obsolete subradiatd; margine ventrali subar- cuato antice acclivi ; cosld nmbonali eminente rotmi- datd, lunula perparvd, area posticd laid, natibus costis divergentibus ornatis; margaritd albd, dentibus cardi- nalibus crenatis et sublamellaribus, dentibus lateralibus sfriatis et siibrectis. The Ukdguay Unio. Shell thickish, inflated, oboval, biaugular behind, subequilateral, polished, concentri- cally subsulcatcd at each end, smooth in the middle, greenish-brown, with very indistinct rays ; ventml edge somewhat arched, rising in front ; umboual ridge prominent and rounded, lunule veiT small, hinder area broad, beaks adorned with divergent ribs, nacre white, primary teeth crenulated and some- what lamellar, lateral teeth striated and straightish. Lea, Obs. on Unio, vol. x. p. 24. pi. 45. f. 298. Bab. Uruguay. Near delodoidns, but not so wide, and has a smooth and darker epidermis; it is more veutricose and more eDiptical than Wyiiianii. The colour is darkest pos- teriorly. Species 449. (Mus. Lea.) Unio Wymanii. Uu. testd incequilaterali. obovali-siib- quadratd, postice late biangulaid, depresad (et antice iiiaxime), crassiiisculd, coiiceidrice subsulcatd (antice prcBsertiin), olivaceo-nigrescente, vel concolore, wl ob- scure radiatd, margine ventrali convexo ; costd nmbo- nali prominuld, rotundatd; natibus parvis, plicis bre- vibus subdivergentibus, radiatis, lunula incoiispicud, margaritd albd; dentibus cardiiialibus angiiste subtri- gonis, crenulatis; dentibus lateralibus longis, crenu- latis. Wyman's Unio. Shell inequilateral, squarish oboval, broadly biaugular behind, depressed (especially in front), tolerably thick, concentrically subsulcated (particularly in front), blackish-olive, at most indis- tinctly rayed ; ventral margin convex, urabonal ridge rather prominent and rounded ; beaks with small divergently radiating ridges; lunule not evident, nacre white ; primary teeth narrowly subtriangular. crenulated; lateral teeth long and crenulated. Lea, Obs. on Unio, vol. x. p. 17. pi. 42, f. 2S9. Hab. fruguay. The shape is peculiar when combined with the radiating folds. Uiui^ PI. LUXV Scr-verby. del et lilh Tmcout Brooks. Day k Son. Imp U N I 0. Tlate LXXXV, Species 450. (Mus. Hanley.) Uxio AsrEKATUs. Uu. testd soUdd, in medio ventricosd, ■iitrinqxe dejiressd, valde inaquilaterali, antice irun- catd, jiostice late rotu7idato-suhbian(/idutd, luted con- colore, veri'/wis magnis depressis 7mdi(jiie (itisi (inlice et nates vermis) ornatd, concavitate radiaide nulla in- strucfd, verrncin posticis minorilas et in serielt/rs coii- fertis curvatis ordinatis ; costd iimboimU nulld ; um- homhun ohlitiuis, emineniibus, lunula conspicna, mar- garitd alba, margine cardinali latissimo, dentibits car- dinalibus permagnis, trigonis ; dentibits lateralibtis percrassis. The kol-geed Unio. Shell solid, ventricose in the middle, depressed on either side, very inequilateral, tnuicated in froat, broadly rotundately subbiangular behind, of a uniform dirty yellow, adorned except in front with big, ilattened, wart-like tubercles, devoid of any radiating concavity, the posterior warts smaller and arranged in curved and crowded rows ; no um- bonal ridge ; umboes oblique and projecting, lunule conspicuous, nacre white, hinge-margin very broad, primary teeth very big and triangular, lateral teeth extremely thick. Lea, Journ. Ac. N. S. Philad. vol. v. (and Obs. on Unio, vol. viii.), pi. 7. f. 318. Uab. Alalwma river, N. America. The ridges of growth are so arranged as to appear pli- ciform. Species 451. (Mus. Hanley.) Unio elongatulus. Un. testa pand, tenuiusculd, snb- ventricosd, oblongo-elongatd, modice in/nquilaterali, an- tice porrectd et anguste rotundatd, luteo-oUvaced, hand radintd, sed adcostam iimbonalem inconspicitam viridi rnngis minusve fuca.td, lavigatd ; margine ventrali siib- retiiso, antice arcuathn acclivi; margine dorsali pos- fico jnndidimi acclivi, nmbonibus satis eminentibm, na- ir,. ^ I'ni'ix I'ln'ris riidibus concentrice midatis, liinidd ,//' . r " '■:! albidd, pallide ruhro scepins tinctd, i!i.i;;:',ii\ f,!ril,,iid'ihii.s magnis, cristatis. The little elongated Unio. Shell small, thinnish, subventricose, elongated-oblong, moderately inequi- lateral, projecting and narrowly rounded in front, olivaceous-vellow, not raved, but more or less stained with green at the inconspicuous umbonal ridge, smooth ; ventral edge somewhat indented, rising in a curve anteriorly ; hinder dorsal edge very slightly elevated ; umboes moderately projecting, beaks with a few coarse concentric undulations ; no lunule ; nacre whitish, usually with a pale red stain ; primary teeth big, crested. Von MiiHLFELD in Rossmiissl. Icon. L. uiid S. Moll. pt. 2. p. 23. f. 132, and pt. 13. p. 27. pi. 5(5. f. 751. Rah. Dalmatia and Laybach. Although distinct from pictornm, to which it has been referred by certain writers, the species comes somewhat too close to Reqiiieni to be accepted without demur. Species 452. (Mus. Hanley.) Unio glabek. Un. testd pand, sitbtetiiii, depresm, ob- longd, incequilaterali, luted, antice concentrice rugosd, postice Icevi et radiis angnstis viridibus oruatd, mar- gine ventrali retiiso, cosid nmbonali inconspicud, lunula iiuprcssd, nmbonibus plicis riidibus subeoncentricit nnda- tis, Margarita albo-carulescente, dentibits cardinalibus pgramidalibits, laciniutis. The smooth Unio. Shell small, thinnish, depressed, oblong, inequilateral, dirty yellow, concentrically wrinkled in front, smooth and adorned with narrow gi-een rays posteriorly ; umbonal ridge inconspicuous, lunule impressed, umboes subconcentrically waved with coarse folds, nacre bluish-while, primary teeth pyramidal and jagged. Lea, Trans. Amer. Phil. Soc. vol. vi. (Obs. on Unio, vol, ii. p. 34), pi. 10. f. 29. Hob. Tennessee, N. America. Species 453. (Mus. Taylor.) Unio truncatus. Un. testd crassd, tumidd, ante me- dium stibconcavd, eloyigatd, snbcimeiformi, maxime in- aquilaterali, antice latiore, justice atteuuatd, inferni sinuatd, nitidd, luted, uonnunquam. lideo-olivaced, zonis increnienti fuscis paucis ornatd, hand radiald, subhevigatd ; costd umbonali nulld, tmihonibus tuiui- dis et rnlde eminentibus, lunula profunda, natibus in- curcis, margaritd albo-argented, dentibits curdinalibiis September, ISGS. U^'IO.— Plate LXXXV. lamellarihus, iransversis, cristatis, in valvi/ld sinktrd ad basim conjmiclis. The truncated Unio. Shell thick, tumid, somewhat concave before the middle, elongated, somewhat wedge-shaped, pecidiarly inequilateral, broader in front, somewhat tapering behind, sinuous ventrally, glossy, dirty yellow, or yellow-olive with a few fus- cous zones of increase, not rayed, nearly smooth ; no umbonal ridge, umboes tumid and very prominent, lunule deep, beaks incurved, nacre silvery white, pri- mary teeth lamellar, transverse, crested, united at their base in the left valve. Swains, Zool. Illust. ser. 2, Uuio, pi. 1. Hall. Kiver Tigris, near Bagdad. The beaks are apparently simple. Species 454. (Mus. Hanley.) Unio arctior. Un. testd oblique elongato-oblongd, crassd, depres.^a, antice brevi et angmte porrectd, postice at- tenuaiiitt subbiangidatd, lutescente et olivaceo-viridi obscure radiatd, conceiitrice substriald, margine ven- trali convexo antice acclivi, costd timbonali subincon- spicud, lunnld impressd, natibus aciitis porcis crassis 3-3 subconcentrice instructis, margaritd suhpurpnred, dentibus cardinnlibus laciniatis, subtrigoiiiis. The much-pinched Unio. Shell obliquely elongated- oblong, thick, depressed, short and narrowly pro- jecting in front, taperingly subbiangular behind, ob- scurely rayed with olivaceous green and dirty yellow, concentrically substriated ; ventral edge convex and anteriorly sloping upwards, umbonal ridge rather in- conspicuous, lunule impressed, beaks furnished with 2-3 almost concentric coarse ridges, nacre pui-jjlish, primary teeth jagged and triangular. Lea, Trans. Amer. PJiil. Soc. vol. vi. (Obs. on Unio, vol. ii. p. 10), pi. 4. f. 10. Hah. Ohio, near Cincinnati, N. America. ^'ery near gihbosns, yet of a different shape. Species 455. (Mus. Hanley.) Unio multistriatus. Uh. te. ; primary teeth very long, lamellar, very oblique ; la- teral teeth straightish. Lea, Obs. on Unio, vol. vii. (Journ. Ac. Nat. Sc. Philad. ser. 2. vol. iv.), p. S3, pi. 42. f. 144. Hub. llio de la Plata, S. America. Lea, who described this i-are shell from a single speci- men, remarks that in outline it approaches U. Faranmsis. Species 476. (Copied from Lea.) Unio spissus. Un. testd crassd, ventricosd (antiee autem depressd), subaquilalerali, subelliplicd, postice obtuse biangulatd, fusco-rufescente, obscure radiatd, in/erne concentrice striatd (vel sulcatd), superne nitidd Irevi- que, costd umbonali valde elevatd et obtuse angulatd, ared posticd, dorsali latissimd, rude striatd et bipor- catd, lunuld angustd, margaritd scepius purptired (ali- quando autem pallide rubro-aurantid) ; dentibus car- dinalibus inagnis, erectis, compressis, crenulatis ; den- tibus lateralibiis percrassis, elongatis, subarcuatis. The compact Unio. Shell thick, ventricose (but de- pressed in front), subequilateral, subelliptic, bluntly biangulated behind, reddish-brown, obscurely rayed, striated or grooved concentricaUy below, shining and smooth above ; umbonal ridge much elevated and bluntly angidar, hinder dorsal area very broad, coarsely striated and double-ridged, lunule narrow, nacre usu- ally purple (sometimes salmon-coloured); primary teeth big, erect, compressed, crenulated ; lateral teeth long, very thick, somewhat curved. Lea, Obs. on Unio, vol. vii. (Journ. Ac. Nat. Sc. Philad. ser. 2. vol. iv.), p. 26. pi. 25. f. 89. Ilab. Satilla river, Georgia, America. Allied to Lecontianus, but less transverse. Unw PL LXXXIX. Sowerbv. del.et liili Vjnctuit Brooks Dayte, con- ceidrice sidjrtigosd, umbonibus costis obliqiiis satis viagiiif onialis, costd umbonali rotundatd, natibtis proiiiiiiulis, margaritd alba ; dentibus cardinalibus lotigia, coiiipressis, in valvidd dextrd 2 ; lamellis late- ralibiis prodiictis, siibrectis. Dunkek's Unio. Shell not thick, more or less ventri- cose, oblong-elliptic, inequilateral, angulated at each end of the dorsal edge, glossy, blackish-brown, some- what wrinkled concentrically; umboes adorned with somewhat large oblique ribs, umbonal ridge round- ed, beaks a little projecting, nacre white ; primary teeth long, compressed, two in the right valve ; la- teral lamellae produced, straightish. Lea, .Journ. Ac. Nat. Sc. Philad. scr. 2. vol. iii. (Obs. on Unio, vol. vi. p. 25), pi. 28. f. 20. Hab. Itio .Janeiro (Dunker), and New Granada (Ver- reaux). Species 480. (Copied from Lea.) Unio Poeyanus. Un. festd crassiusculd, si(bcylindraced, in medio retmd, hirequilaterall, arcuatim elongato-ob- longd, inferue iiicurvatd, entice brevi sed porrectd, lilted seu luteo-olivaced, postice lavigatd, antice con- cetitrice striatd, coda umbonali leviter siibcariiintd, uatibus proiniiiuliis, liaud imdulatis ; mnrgarild fiaves- cente ; dentibus cardimilibiis aubcompressis, cri'imlatis ; lamellis lateralibiis rectis, productis. Poey's Unio. Shell thickisli, subcylindraceous, retusc in the middle, inequilateral, curved elongated-oblong, incurved veutrally, short but projecting in front, yel- low or olive-yellow, nearly smooth behind, concen- trically striated in front; umbonal ridge slightly sub- carinated ; beaks a little prominent ; not undulated, nacre yellowish ; primary teeth somewhat compressed, crenulated; lateral lamellae straight, produced. Lea, Journ. Ac. Nat. Sc. Philad. ser. 2. vol. iii. (Obs. on Unio, vol. vi. p. 35), pi. 32. f. 30. Hab. Eio de las Balsas, near Coyucan, Mexico. The surface is most minutely granular. Species 487. (Copied fi-om Lea.) Unio Wiieatleyanus. Uh. testa crassd, ventricosd, sub- elUplicd, subineeqiiilaterali, postice subbiaiirjitlatd, iii- feriti siibarciiatd, tenebroso-olivaced, sublavigatd, ad umbones costis divergentibus radiatd, costd umbonali obtuse angulatd, natibits prominiiUs, lunuld aid nulla vel incouspicud, murgnrild alhidd seu earned ; denti- bus cardinalibus mngnis, crciinlatis, in utrdque valvuld 2 ; dentibus lateralibiis i-nlidis, productis, obliquis. Wheatley's Unio. Shell thick, ventricose, somewhat elliptic, somewhat inequilateral, subbiangular pos- teriorly, somewhat arched veutrally, dark olive, smoothish, rayed at the umboes with diverging ribs ; umbonal ribs bluntly angidar, beaks a little project- ing, lunule, if any, inconspicuous, nacre whitish or flesh-colour; primary teeth large, crenulated, two in September, J868. UNIO.— Plate XC. each valve ; lateral lamella; strong, produced, slant- ing. l.EA, Journ. Ac. Nat. So. Philad. ser. 2. vol. iii. (Obs. on Uiiio, vol. vi. p. 281, pi. 29. f. 23. Rab. Kio Plata and Rio Negro, S. America. Species 488. (Copied from Lea.) Unio favosus. Tin. tesii crasnd, depresdmcu.ht, lati ovali, siibinaquilateraU, postice subbiauyulald, stipenie Icevl, infei'ne coucenlrice striata, saturalius olivaceo- Itifea, maciilarum viridium serie unicd ante costa/n nui- bonalem snbrotundatam ornatd ; maryine veiitrali ur- cuato ; lunula vel nulla, vel iticouspicud ; natibus pro- mmidis, ad apices uiidk snbrudibus 2-3 ornatis, mar- garild alba; dentibus cardinalibus mayuis, ereclis, pyi-amidalibm, crenulatis, in valvuld sinislrd 2 ; la- nieUis lateralibiis productis. The honey-combed Unio. Shell thick, somewhat de- pressed, broadly oval, somewhat inequilateral, sub- biaiigular behind, smooth above, concentrically stri- ated below, dark olive-yellow, with a single row of broad spots before the somewhat rounded umbonal ridge ; ventral edge arched ; lunule, if any, not con- spicuous ; beaks a little projecting, adorned with two or three rather coarse undulations, nacre white ; pri- mary teeth large, erect, pyramidal, two in tlie left valve ; lateral lamellaj produced. Lea, Journ. Ac. Nat. Sc. Philad. ser. 3. vol. iv. (Obs. on Unio, vol. vi. p. 58), pi. 8. f. 40. llab. Othcalooga Creek, Georgia, America. The Javanese Unio. Shell thickish, subventricose in the middle, very inequilateral, subovate, sloping up- wards in front below, depressed and subbiangular behiiul, smooth, shining, of a uniform yellow-brown ; beaks scarcely prominent, nacre white ; primary teeth very small, single in the right valve ; lateral lameUse long, curved. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. viii. (Obs. on Unio, vol. iii. p. 58), pi. 18. f. 37. U. iiiuiatns, Mousson, teste Philippi. Ilab. Java. The colour is said to be very dark on the hinder dorsal slope, on which arc de|)ieted some oblique diverging wrinkles. If Philippi should be right as to its identity with viutalas, the colour of the epidermis should be green or olivaceous. Species 489. (Copied from Lea.) 10 Javanus. Un. testa crassiusculd, in. medio subven- Irivosd, valde inaquilaterali, subovatd, anlice inferm acclivi, postice depressd et subbianyulatd, Icevi, nitidd, J'usco-lutesceute concolore; natibus mxprominiilis, mar- yuritd alba ; dentibus cardinalibus perparvis, in val- i-uld dexlrd sinyulis ; lahiellis lateralibus lonijis, rurcatis. Species 490. (Copied from Lea.) Unio rubellianus. Un. testa parvd, mayis minusve crassd, siibventrieosd, elonyato-oblonyd, inferne late in- curvatd, postice subattenuatd anyulatd et plicis parvis divergentibus instructd, alibi laviyatd, rubella, obsolete radiatd, costd umbonali anyulatd ; natihis eminent ibus et sparsim irreyulariter undulatis, maryaritd auran- tio-rubru; dentibus cardinalibus parvis, ereetis, aeutis; lamellis laterulibus rectiuscuUs. The buddy Unio. Shell small, more or less thick, sub- ventricose, elongated-oblong, broadly incurved ven- traUy, somewhat tapering angular and marked with small diverging folds behind, elsewhere smooth, red- dish, with indistinct rays; umbonal ridge angular; beaks prominent, with a few irregular undulations, nacre reddish salmon-colour; primary teeth small, erect, sharp; lateral lamellae straightish. Lea, .Journ. Ac. Nat. Sc. Philad. ser. 2. vol. iv. (Obs. on Unio, vol. vi. p. 70), pi. 13. f. 51. Hab. Othcalooga Creek, Georgia, America. " The rays are indistinct, and arc formed partly by ob- scure arrowiu-ad or zigzag markings, which are plainer on the posterior half." Utur PI. XCI. L Brooks. Day &.Son. Imp Sowerby.deletlith U N I Plate XC[. Species 4'Jl. (Copied from Lea.) Unio Oeiextalis. Uii. tosid crasunscuhi, di'pirssa, oh- longo-elougaid, inccquilaleraU, lam, n'ltidd, liitni, zatiis iHcremeuii angmik ftisco-mriiUliiis jiirtii, costd nmhonali angidatd; ared pOHticd dorsali. /iris hiiiis rudiaiUibiis, et radiis angustis ornatd ; nnlibus ri.v ewi/ieii/iims, ad apices minute mididatis ; iiiargnnld aihd • dentibus cardinalibiis compirssis hiiffivjiie ; la- mellis laieralibm prodiwtis. The OniENTAL Unio. Shell tliickisli, depressed, elou- gnted-oblong, inequilateral, smooth, shining, dirty yellow, painted with narrow green-brown zones of increase ; umbonal ridge angular, hinder dorsal area with two raised lines, and narrow rays ; beaks scarcely projecting, with small undulations at their tips; nacre white; primary teeth long and com- pressed ; lateral lamellae produced. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. viii. (Obs. on Unio, vol. iii. p. 59), pi. 18. f. 38. U. producliis, Mousson, teste Philippi. Ilah. .lava? As often happens, the figure and description do not quite coincide. It is said to be yellow inclining to green- ish-brown, with two yelloto rays on the posterior dorsal area. U. prodiictus is described as of a uniform green- ish-brown. Species 492. (Copied from Lea.) Unio Uutto.manus. Uii. tedd crassiiiscula, mbdepressd, vulde inteqidlaierali, subeylindraced, in/erne relusd, postice attemudd et siihbiaHgulaid , fused, incompiciu' radiald (ill tnbidd niitem color videtur fusco-lidescens, liiu'is nri'idibiis rnditd/is), area podlcd dorsali hdd el jiliiiiiiliitd, iiiargarild alhd ; deiilibiis cnrdiiiaHbits per- piiri'is ; lamdlis lideralibiis prodifclis, fennibiis, hand riirra/ix. Dittiin's Umo. Shell thieki.sh, somewhat depressed, very inequilateral, subcylindraceous, indented below, alteiuKili'd and subbiangular behind, dark brown with indistinct rays (in the Plate the colour seems yellow-brown with the linear rays dark green), hinder dorsal area broad and flattened, nacre white ; primary teeth very small ; lateral lamellee produced, thin, not curved. Lea, Trans. Am Unio, Noi. i Hab. Savannah, Allied to lulliculahis. Species 493. (Co|: Unio follicvlatls. Uh. I d from Lea.) ti! ■iubl ir-i, drpr medio rriiii),.wbn/li,„l rnhh' ur.i.n/ale iiiferm relusd, pusliri' \i''iili'm,i'ii:!,ilii , ^ii^i'^thj,, fiisco-nigresei'ide ; iiiiii''i's n.r r.,i: .in:! 'c. s, „/,//•./,(/■ srppius purpurea ; dfiililiii\ <-:iri!niiilili:'y, purris. In lis ; lamellis laleralibiis Uiiigis, paiiliilum ciircatis. The saddle-bagged Unio. Shell thinnish, deprcs: (especially in the middle), subcylindraceous, very equilateral, indented below, subbiangular behind, i seulptnred, blackish-brown ; beaks scarcely proje ing, nacre usually purple ; primary teeth small a lobed ; lateral lamelhT long and very slightly curvi Lea, Trans. Amer. Phil. Soc. ser. 3. vol. vi. (Obs. Unio, vol. ii. p. 38), pi. 1 1 . f . 33. JLab. Savannah river, Georgia, Anun-ica. Allied to Sliepardiaiins, and not inqirobably a you variety. Species 494. (Coiiied from Lea.) Unio DaRIENSIS. Uu. teslii r,-,/vA//,x.-,-//, ni.i'unihderaH, ublovgd, iii/enii' hand retu^^: . ,i,i!ir',' rn:,r.irii-tli-pri'\.-i.!. postice iiijluld et biniiyiihild, licci, J'ii\i:o-lulcscenle, obsolete radiatd ; eusld nmliuiiati elevatd, satis iicale subcarinatu, posliir phmehilii -, untibns promiuidis. plauidatis, viargaritii idhu ; liiMeilis lidrrulibus pro- ductis. The Unio of DaKIEN. Shell thicki^h, inequilateral, nb- long, not iiuleiited below, concavcly depressed iu front, inflated and biangular behind, smooth, yellow- ish-brown, obsoletely rayed ; umbonal ridge elevated, rather sharply subcarinated, flattened behind ; beaks rather prominent, flattened, nacre white; lateral la- melliE produced. Lea, Trans. Amer. Phil. Soc. ser. 3. vol. viii. (Obs. on Unio, vol. iii. p. 84). pi. 36. f. 61. Hab. Near Darien, Georgia, .Vmeriea. September, 1868. UNIO.— Plate XCI. Remarkable for its high acutely angular umboual ridge, and flattened sides. Species 495. (Copied from Lea.) Umo Sapotalensis. Un. tesld crasad, uld anlici ven- tricosa, ad umbones autem planiilaid, inesqiiilaierali, subovali, hiferne retimt, postice subbiangitlaln, luted, liiieis permidlk viridibiis undlqiw radiatd ; coda um- bonali subcarinatd, natibus vice prominuUs, margaritd subaured ei pulc/ierrime iridescenle ; dentibm cardl- nalibus satis magnis, in valvidd dextrd singulis ; la- tuellis laterulibas magnis, remotis, rectiusculis. The Sapotal Unio. Shell thick, ventricose except in front, yet flattened at the umboes, inequilateral, sub- oval, indented below, subbiangular behind, yellow, everywhere rayed with very numerous green lines ; umbonal ridge siibcarinated, beaks scarcely project- ing, nacre of a somewhat golden yellow, and beauti- fully iridescent ; primary teeth moderately large, single in the right valve ; lateral lamella' large, dis- tant, straightish. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. viii. (Obs. on Unio, vol. iii. p. 71), pi. 21. f. 47. JJob. Sapotal river, Tlouotalpaui, Mexico. riilge subanguhir, liiuder dorsal area broadish ; beaks a little projecting, compressed, the tips with a double row of concentric uudulatious, nacre white ; primary teeth rather small, lamellar, single in the right vtilve ; lateral lamelkc short and straight. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. x. (Obs. on Unio, vol. v. p. 13), pi. 13. f. fi. Jlab. S. Carolina, America. This pretty shell, which reminds one of f'. jiresnus {Symphonota compnasa), is somewhat disposed to be winged. Species 496. (Copied from Lea.) Unio decokatus. Uit. testa subtemii, depn'ssiascidd, subovatd, iubinmqiiilaterali, infirnh vi.i- retiisii, viridi- Jlavescente, radibs capillaribiis uiiil/i-i /'■/•>■ lunliijiie or- natd, lavi; costd umbonali suiuiiynlutii, ami dorsali posticd latiusculd ; natibus promiiiidis, compressis, ad apices undulai'um serie diiplici concentrice iiistnictis, ■margaritd albd ; dentibus cardinalibits satis purcis, la- mellaribus, in valvuld dextrd siiigidis ; lamcliis hilc- ralibus brevibus, rectis. The adorned Ukio. Shell thinuish, rather depressed, subovate, somewhat inequilateral, scarcely indented below, yellowish-green, almost everywhere adorned with numerous capillary rays, smooth ; umbonal Species 497. (Mus. D'Orbigny in Mns. Brit.) Unio Mixuanls. Un. testa crassd, veutricosd, subinee- qiuluteruli, oblique subovali, subrhombed, antice an- gustd sed porrectd, suUavigatd, cinereo-luteo-virides- cente, liueis vireutibus supra costam umbonalem rotun- 1 datam. radiald ; margiiw dorsali autico perJiumili, brevi, incun-ato-acclivi, ad extremitatem anyulato ; lunuld magnd el maxime profundd ; margine ventrali subarcuato, antice acclivi; timbonibus eininentibus, na- tibus acutis infiexisque, margaritd argented ; cardine 111 in fossiculifero, tubercuUs autem magis lamellatis. The Minuan Umo. Shell thick, ventricose, rather in- equilateral, obliquely suboval, subrhombie, narrow yet peculiarly jutting out in front, smoothish, ashy yellowish-green, with dark green linear I'ays beyond the rounded umbonal ridge ; front dorsal edge very low, short, incurvately rising, angulated at its extre- mity ; lunule large and very profound ; ventral mar- gin subarcuated, rising in front; umboes prominent, beaks acute and inflexed, nacre silvery ; hinge as in fossicnliferus, but tubercles more laminar. D'OuiilGNY [Monocondglcea), Amer. Mi'rid. Moll. p. C12. pi. 70. f. 8, 9, lU. U. Parchappii, D'Orb. Hab. La Plata. Li Parchappii (from the Argentine Eepublic) the nacre has a somewhat oranare tint. rrur r'l.xcn. Sowerljy del et liil-i Vincent Brookp.IiayJIiSon. Imp U N I Plate XGII. Species 498. (Copied from Lea.) Unio Lamarckianus. Uh. testa cmssii, depressa, in. medio plunuldld, siihaqidluleraU, postice obtuse hiaii- ijiilaid, iiifciiii nrcnald, hded, radiis viridibiis piinc- talis luli-rntplis sidicateiialis (antice iiiajoribus) itii- diijifc onidfd, i/icoHxjjiciie snbuodosn, aliter Ifevhjatd ; costd nmboiiali obtuse aiigulatd, nntibus eiiiiueiitib/is ad apices compresso-angidatis, marrjaritd albd ; dmti- bus cardiuulibus mcgnis, compressis, creindalis ; Ja- mdlis lateruUbus crassis, brevibus, reniotis. Lamarck's Unio. Shell thick, depressed, flattened in the middle, subequilateral, bluntly biangulated be- hind, arched below, yellow, everywhere adorned with green dotted somewhat chain-like interrupted rays (which are larg-er in front), indistinctly subuodose, else smooth ; umbonal ridge bluntly angular, beaks prominent, compressed and angular at the tips, nacre white ; primary teeth large, compressed, crenulated ; lateral lamellae thick, short, distant. Lea, Trans. Amer. I'hil. Soo. ser. i. vol. x. (Obs. on Unio, vol. V. p. 22), pi. 17. f. 20. U. AbiTii, Conrad, teste Conrad. Hub. Arkansas, America. Between irroridns and securis. The lines of growth are very few, and the nodules are little more than rugosi- ties disposed to run into small folds. Species 409. (Copied from Lea.) Unio sagittiformis. Uh. testa teiiui, depressd, fere siibcgguilaterali, oblique oblonf/o-eloiKjcdd, postice acii- tamj/dai-i, ii/fente antice acclivi, Irsviyald, siibfascd, radiis vireidibits latis undique profuse ornatd, costd umhonali subacute angidatd ; area posticd dorsali subpland, lird unicd radiante instructd ; natibus parvis, proiuiuuUs, ad apices nudulatis, margaritd purpurea ; dentibns cardinulibus compressis, creuula- laiis, in ulrdque valculd 2 ; taii/ellis luteraHbus luiiyis, recliusculis. The AttROW-HEAD Unio. Shell thin, depressed, almost subequilateral, obliquely elon^'ated-obloug, acutan- gular behind, rising in front below, smooth, brown- ish, everywhere profusely adorned with broad dark green rays ; umbonal ridge somewhat acutely angu- lated; hinder dorsal area ilattish, provided with a single radiating raised line; beaks smab, a little projecting, undulated at the tips, nacre purple ; primary teeth compressed, crenulated, two in each valve; lateral lamellcB long, straightish. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. x. (Obs. on Unio, vol. V. p. 33), pi. 22. f. 35. Ilab. Georgia, America. Approaches Fisheriauus, but is less elongated, and has broader rays. The species was described from two speci- mens only; the nacre will probably be found to vary. Species 500. (Copied from Lea.) ITnio persTRIaTUS. Un. testa lei/ui, pUinuUilo-snbcy- lindricd, satis in/equilaterali, infiTui >iid)rclii\d ■ i-ni- dermide fusco-liiled coucolorc, striis mullis ihihrica- tis coHCenlric'e iiiKtnictd, uVder Imigatd ; costd um- buuali plana et biamjuhdii, urea dorsali posticd lata et planulidd ; natibus rix einiuentibus, ad apices ini- iiulii uuJuhdis, margaritd albd, rarius purpuras- cente ; deulibus cardinulibus parvis, obliquis ; lainel- lis lateralibus longis, rectis, postice incrassatix. The thoroughly striated Unio. Shell thin, llat- tened subcylindrical, moderately inequilateral, some- what indented below ; epidermis of a uniform yel- low-brown, furnished with numerous concentric im- l)rieate(l stri;e, otherwise smooth; umbonal ridge Hut and biiiiigulated, hinder dorsal area broad ami flattened ; beaks scarcely raised, minutely undulated at the tips, nacre white, very rarely purplish ; \m- mary teeth small, oblique ; lateral lamella; long, straight, thickened posteriorly. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. x. (Obs. on Unio, vol. V. p. 11), pi. 12. f. 3. Hab. S. Carolina. The lines of growth are k\\. Species 501. (Copied from Lea.) Unio satur. Un. testa crassd, tuuudd, valde in/vquila- lerali, antice angustissimd (sed porrectd) , postice subalatd truncatd et late biangidatd, Icevi, politd, fused concolure (in junioribus, autem, olivaced), liga- mento brevi crassoque ; costd uuibonali versus uates September, 18C8. INIO.— Plate XCII. iiKi/jncn in/lal(is <■( late rotiindatas fmnidd ct ancju- latd, area, (lormli podkd plumdatd suico obscuro latiuscido radiaid, margaritd albd ; deutibtis cardi- iialibiis magiiis, uhUquis, coti/pirssis, cremdatis, acu- vnnatk ; lamelUs lateraUbtis lonyk, ctirvatis. The glutted Unio. Shell thick, swollen, very inequi- lateral, very narrowly rounded (yet peculiarly pro- jecting) in front, somewhat winged truncated and broadly biangulated behind, smooth, polished, of a uniform dark brown (but olivaceous in the young) ; li.H'ament short and thick ; umbonal ridge tumid and angular towards the large swollen and broadly rounded beaks, hinder dorsal area flattened and rayed with a single obscure broadish furrow, nacre white; primary teeth large, slanting, compressed, creuulated, acuminated; lateral lamellaj long, curved. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. x. (Obs. on Unio, vol. v. p. 21), pi. 17. f. 19. Hob. Louisiana, U. S. America. Species 502. (Copied from Lea.) Unio Pazii. TJh. iestd crammcald, valde inrTqmlaU'- rali, lanceolald, antice vcidi'icosd ei latiure, posfice gradaiim. depressd el curvato-citneifoi-mi, hifirne an- tice arcuulini aeclivi, ad umhones Uimidd, lavi, oliva- ced,fere n/idigi/e inconspicue radiaid, zo/ns incrementi 2 latis lideis reraoiisque ornatd ; nalibus injlalis fsa- pitts eroaisj ; costd umbouali aiignlatd ; ared posticd dorsali valde angudd, virente, liris iiicoiispicuis bira- diatd ; liinuld bene impres-m, margaritd albd vel albo-cixrulesceide ; dentibus cardinalibus lamellatis, [ valde obliquis, corriigatis, in valvuld dextrd ningulis ; I iamellis lateralibus productis, corrugatis. Paz's Unio. Shell thickish, very inequilateral, lanceo- late, ventricose and broader in front, gradually dc- j pressed and curved wedge-shaped behind, rising i with an arched curve at the front ventral margin, swollen at the umboes, smooth, olivaceous, almost | everywhere indistinctly rayed, adorned with two dis- j taut dirty yellow zones of increase; beaks inflated (usually eroded), umbonal ridge angular ; hinder dorsal area very narrow, dark green, with two indis- tinct raised radiating lines; lunule well-marked, nacre white or bluish-wliite ; primary teeth lamellar, very oblique, wrinkled, single in the right valve ; la- teral lamellfc produced, wrinkled. I.EA.. .lourii. Ac. Xat. Sc. ser. 2. vol. vi. (Obs. on Unio, vol. xi.). p. fil. pi. 21. f (iO. Hab. Siam, China. I suspect is only a form of Ligallsianiis. Species 503. (Copied from Lea.) Unio Mouhotianus. Un. leatd tenui, depreasd, oblongd, i)i(eqi(ilaterali, inferui siibrelusd, poslice rotwndalo- subbiungulald, fiisco-lidescente concolore ; codd um- bouali paulidmn elemtd el rotnndd ; ared dorsali pos- licd angudd; nalibus j)rominulis ; margaritd albidd, valde iridescenle ; dentibus cardinalibus minimis, lo- batis ; lainelUs luteralibus tiullis. Mouhot's Unio. Shell thin, depressed, oblong, inequi- lateral, somewhat indented below, rotundately sub- biangular behind, of a uniform yellowish-brown ; um- bonal ridge very slightly raised and rounded ; hinder dorsal area narrow ; beaks slightly projecting ; nacre ■whitish, very iridescent ; cardinal teeth very small, lobed ; no lateral lamella;. Lea {Monocondylaa), Journ. Ac. N. Sc. Philad. ser. 2. vol. vi. (Obs. on Unio, vol. xi.), p. Go. pi. 21. f 62. Hab. Laos Mountain, Cambodia. Allied to Baiiellii, but is less transverse, and less in- equilateral. There are small obscure undulations on the umbonal ridge. Species 50-t. (Copied from Lea.) Unio coxcavus. Un. tesld subtenui, -iiibvenlricosd, sub- aquilaterali, ellipticd, antice satis late rotundatd, pos- lice subangulatd, inferne arcuatd, lavi, politd, pallide Itded, radiis viridibas mullis angu.slis pictd ; costd umbonali inconspicud, aredposticd dorsali subangustd ; inargarild albd ; dentibus cardinalibus compressis, in nlrdque valvuld .singulis ; lamelUs lateralibus rectis, longin.^c/ilis. The concave Unio. Shell thinnish, subventricose, sub- equilateral, elliptic, rather broadly rounded iu front, subangular behind, arched below, smooth, polished, pale yellow, painted with numerous naiTow green rays ; umbonal ridge inconspicuous, hinder dorsal area rather narrow ; nacre white ; primary teeth com- pressed, single in each valve ; lateral lamcllse straight, longish. Lea, Trans. Amer. Phil. Soc. ser. 2. vol. x. (Obs. on Unio, vol. V. p. ir,), pi. 15. f. 11. Rab. S. Carolina, America. Des a single adult example Utuo PL icni. Sowerby, del ethtli Vincent Brooks. ilaytSon.linp U N I Species 505. (« ami />, ilus. D'Orbigny in IMus. ]'.nt.) Unio Ciiarruanus. Un. testa cmssd, ventricoxd, ovali- oliloagd (nouHiiiiqiiuiti obloiiyo-ehngatd) , inj'i'nie tr- tiisn, post'ice o/jt/is? siibhiangulatd, aned, hnmneo-viri- descente, lavigaid (nisi ad nates promintdas porcis oh- Uqids subdivergentibus radiatas) ; casta umbonaU in- conspicud, rotundatd ; lunula vise ttlld ; margnritd argented ; dentihus cardinalibus sublamellatis. aiitico in valvuld sinistra cristato vel sagrinato, postico in dextrd corrugato ; lamellis laleralibus longis, rediiis- cidis, e/fvotis. The Charrua Unio. Shell tbict, ventrieose, oval-ob- long (sometimes elongated-oblong), indented below, bluntly subbiangular behind, bronzed, greenish- brown, smooth, except at the slightly-projecting beaks, which are rayed with oblique subdivergent ridges -. nmbonal ridge inconspicuous, rounded ; no distinct lunule ; nacre silvery; primary teeth sub- lamellar, front one of the left valve -shagreened or crested, hinder of the right valve corrugated ; lateral lamellae long, straightish, elevated. D'Orbigny, Anu'r. Merid. Moll. p. 606. pi. 71. f. S to 11. U./aba, D'Orb. Ha!) Banda Orientale, S. America. The narrower form delineated is the RJnuicoiciis of D'Orbigny. Species 506. (Mus. D'Orbigny in Mus. Brit.) Unio hyl,i;us. Un. testd crassiusculd, subvcntricosd, satis inceqiiilaterali, subovali, postice subbiangnlatd, oUvaceo-firrugiiied vel olivaceo-lutescente,fere uudiijue porcis mullis obliquis subcurvatis radiatd ; margins ventrah snbretuso, aulice acclivi; costd mnbonali sub- angulatd ; natibus parnis, aciUis, prominuUs ; mar- garitd albidd ; dentibus cardinalibus siibtrigonis, dente centrali verticali ; lamellis lateralibiis longis. The eusu Unio. Shell thickish, subventricose, mode- rately inequilateral, suboval, subbiangidated behind, rusty or yellowish-olive, almost everywhere rayed by numerous oblique somewhat cui-ved ridges ; ventral edge somewhat retuse, rising in front; umboual ridge subangular ; beaks small, acute, a little promi- nent ; nacre whitish : primary teeth subtriangular, the central one vertical ; lateral lamellas long. D'Orbigny, Ame'r. MJrid. Moll. pi. 69. f. 8, U." U. Guaraniams, D'Orb. ; do. f. 10, 11. Hub. Bolivia, S. America. An examination of the type-specimens manifests that Lea is quite right in regarding the two shells as mere forms of the same species. The differences are very slight, and do not quite correspond to the representative figures. The shell marked Guaraniana (500, «), has the ridges more nodulous, a rudimentary lunule, the nacre stained with olivaceous yellow in the extreme concavity, and the lateral lamellse quite straight, instead of being slightly curved at their extremities. There are two pri- mary teeth in each valve : the ridges do not quite extend to the ventral edge (especially behind), and are met at acute angles beyond the ridge by a few raised lines. Species 507. (Mus. D'Orbigny in Mus. Brit.) Unio Psamjioicus. Uu. testd validd, tumidd, valde ob- liqud, in senioribm valde incequilaterali, siibrhombed {siiiiili t'astaliae), ferrugined vel olivaced, conceutrice strils sublamellosis et radiatim porcis obliquis remotis sculptd, plied umbonali angulatd; ared posticd dor- suli concavd, latiuseuld, nid juxta nates valde emi- nenles sitblavigatd ; lunuld distincld ; margaritd albo- cixrulescente, margine cardinali lato ; dentibus cardi- nalibus in utrdque valvuld 3 vel 4 ; lamellis lateralibus perbrenibus, simplicibus, obliquis, subcurvatis. The PsAMMOic Unio. Shell strong, tumid, very ob- lique, very inequilateral in the old, subrhombic, (Cffs^flZifli-shaped), ferruginous or olive, with concen- tric sublamellar strise, and distant oblique radiating ridges; umbonal fold angular; hinder dorsal area concave, rather broad, not sculptured, except near the very prominent beaks ; lunule distinct ; nacre bluish-white, hinge-margin broad; primary teeth three or four in each valve ; lateral laraelhr very short, simple, olilique, somewhat curved. D'Orbigny, Ame'r. Merid. Moll, p. 608. pi. 71. f 4 to 7. Eab. River Parana, Santa FJ. September, 1S6S. UNIO.— Plate XCIII. With the aspect and he animal of Uiiio. Imost the hina;e of Cadaliii, but Species 508. (Mus. D'Orbigny iu Mus. Brit.) I'nio Solisiands. Un. testa, crassiusculd, subventricosd, irueqidlaterali, rotundato-ovali, oUvaeed concolore, conceutrlce rugatd; margine donali antico iiicurvato, ad exlremitatem angulaio, lunula conspicnd instrudo ; margine venfrali entice acclivi; costd umbonaU hu- mili; ared dorsali posticd concavd,perangusld; nalibas proniiuidis ; margaritd alio-ctsridescente ; dentibiis cardiiialibiis binis, magnis, lamellalis, incurvatis, com- pressin ; lauiellis lateralibus tenidssimis,Jlexiwsia. The Solisian Unio. Shell thickish, subventricose, in- equilateral, rounded-oval, of a uniform olive-green, concentrically wrinkle-ridged, front dorsal edge in- curved, angulated at its extremity ; lunule well marked ; ventral margin rising anteriorly ; umbonal ridge not raised ; hinder dorsal area concave, verj' narrow ; beaks slightly projecting ; nacre bluisli- wliite ; primary teeth two, large, lamellar, incurved, compressed ; lateral lamellae very thin, flexuous. D'Orbigny, Moll. Amer. Me'rid. p. 604. pi. fi9. f. 172-3. Hah. Buenos Ayres. The umboes exhibit a few slantingly divergent subni- diating ridges, which in the suborbicular form delineated by D'Orbigny extend over the entire surface. Species 509. (Mus. D'Orbigny in Mus. Brit.) Unio Corrientesensis. Un. testa validd, ventricosd, inaquilalerali, oblique obovali, antice brevi anyustd et porrectd, subltsvigatd, olivaceo-liUeseeute vel virides- cente, sape lineis virenlibus supra coslam umbonalem iaconspicuam rotundatam radiatd ; margine ligamen- tali arcuato, acclivi ; margine ventrali subatigulato, antice praserlim acclivi; natibus eminentibus ; liinuld perangustd, haud profundd ; margaritd ulbo-carules- cente ; dentibiis cardinaUbus magnis, trigonis, tnher- culiformibus, iu utrdqne valvuld singulis; lawellis nullis. The Corrie>'TEs Unio. Shell strong, ventricose, in- equilateral, obliquely oboval, short naiTOw but pe- culiarly projecting in front, smoothish, greenish or yellowish-olive, often with linear dark green rays be- yond the inconspicuous rounded umbonal ridge ; liga- mental margin arched and elevated; ventral margin subangular, rising more especially in front ; beaks prominent ; lunule veiy narrow, not profound ; nacre bluish-white ; primary teeth large, trigonal, tuber- cular, single in each valve ; no lamellse. D'Orbigny {Monocondylaa), Amer. Mcrid. Moll. p. 613. pi. 68. f. 8, 9, 10. Hah. Argentine llepublic, S. America. UnicPlXClV. Sowerby.del etlith Vuicwnt BrooVs.Day*Sc!r.. Imp U N I 0. I'LATE XCIV. Species 510. (Mus. Hanley.) Tnio scutum. IJn. tedd ct-assa, buequaUtcr snhveti- tricosd, hi medio subretiisd, antice isubdepressd, valde inayuilaterali, oblonyd, posiice obliquii subbiangidatd, piced coHcolore, sublavigatd, margine ventrali retuso el aiilicH acclivi, costd umbonuli elevata, ared poslicd dorsali lata el concaviusciild, nalibiis vix promimdis, margarild albo-Uvescente ; deniibm cardinalibus obli- quis ; lamelUs laleralibus remotis. The shield Unio. Shell thick, unei|ually subventri- cose, somewhat indented in the middle, somewhat depressed in front, very inequilateral, oblong, ob- liquely siibbiaugular behind, of a uniform pitch- colour, smoothish ; ventral edge refuse, rising in front ; umbonal ridge elevated, the space behind it broad and rather concave ; beaks but little projecting, nacre livid whitish ; primary teeth slanting, lateral lamellas distant. Benson (teste Theobaldl. Ifab. Tenasserim. The only individual known to us is in such bad condi- tion that many of its characters are probably here omitted. If identical with another undetermined shell from Pegu (which is broader behind and not rctuse below), the umboes are not sculptured, the epidermis is polished, the ridge is rounded and well defined, and the smooth space behind it rayed with one or two impressed lines, the primary teeth (two in each valve) are wrinkled and nar- rowly subtriaugular. Species 511. (Mus. Theobald.) Unio L.4JIELL.4.TUS. Uii. testa tenui, in medio subveiitri- cosu, alibi subdepressd, ovato-mbrhoinboided, inaqui- lateraU, postice dilatatd, Icevi, nitidd, olivaced con- colore ; margine dorsali utrinque siibrecto ; margine ventrali suliarctiato, antice valde acclivi ; ared posticd dorsali valde concavd ; ligammto maxima, lunuld nulla, uatibns liand etiam prominulis, margaritd albo- crerulesceute ; cardine utrinque lamellis laleralibus (ad extremitates deorsum curvatis) instructo. The lamellated Unio. Shell thin, somewhat ventri- cose in the middle, elsewhere somewhat depressed, ovate-subrhomboidal, ineqiulateral, dilated behind, smooth, shining, uniform olive-coloured ; dorsal edge nearly straight on either side, ventral edge sub- arcuated and much rising in front ; hinder dorsal area very coucave, ligament very large, no lunule, beak- uot even a little projecting, nacre bluish white : hinge furnished on either side with lateral lamelke. which are curved downwards at the extremities. Lea, Trans. Anier. Thil. Soe. ser. 2. vol. vi. (Obs. on Unio, vol. ii. p. 19), pi. 6. f. 10. Hab. Pegu (Theobald) ; Bengal (Lea). A rare and remarkable shell, with a very peculiar hinge, quite different from the species erroneously so named in Plate LII. Species 513. (Mn.s. llaiiley.) Unio coccineus. Uh. testa crassd, oblique rotandato- snbqiiadratd, ad umbones eminentes venlricom, infenie subdepressd, antice perbrevi, olivuceo-fuscd, nisi in JHuioribus hand radiatd, vel Uevigatu, vel plicis obso- letin incrementi iantum sculptd; margine cenlrali subarcualo. antice acclioi ; natibus acutis, oblique in- c urea lis ; lunuld conspiciid ; margaritd sa plus pall ide rubra ; margine curdinali latissiino, denlibus crassis verlicalibus corrugatis, laiiielhsque obliquis siibcurciitis instructo. The scarlet Unio. Shell thick, obliquely ruunded- subquadrate, veutricose at the prominent umboes, somewhat depressed below, very short in front, olive- brown, not rayed except in tlie young, either smooth, or only marked by the folds of increase ; ventral edge subarcuated, rising in front; beaks acute, obliquely incurved ; nacre usually pale pinkish-red ; hinge- margin very broad, furnished with thick vertical wrinkled teeth and oblique and somewhat curved lamellae. Hildreth, MSS. in Lea, Trans. Amcr. Phil. Soe. ser. 3. vol. vi. (Obs. onUnio, vol. ii. p. 12),pl. :>. f. 1:.'. U. calillus, Coin'ad. llab. Ohio, N. America. This is quite distinct from the shell erroneously so named in Plate XXII. The beaks are devoid of any pe- culiar sulpture. October, 1SG8. UNIO.— Plate XCIV. Species 513. (Mu^. Haiiley.) Unio SaLWENIANUS. Uu. te^ilu Viilir/d, cf),u;:ni. iinili- subrhomboided, scepim-vibo/jUrjiid, ra/i/t i,irn//ii/„/,'rn//, infcnie siibarenatd, maryiiif lii/aineiitali roi/n'.ro,J'/iscd cotirolore, pr/pi-ipue leevi, in et nupra contam muhiiHaleiu itwonsjiicuam porcu diven/eniibus mbremotis oruatd, natibux eminentibm, maryarita livklo-carnvd ; mar- i/'mi' cnrdinnlia-itgHStissimo, tubercidi) nnico in uirdque vnlvuld, tranxverso simpUcI nrcuato lami'llifornii, tari- lirni iMtriiclo. The Salwen TJnio. Slu-ll strong, convex, oval-siib- rhomboidal, usually somewhat slanting, very inequi- lateral, somewliat arched lielow. lioanientiil edge convex, of a uniform dark brown, for the nio;?t part smooth, but upon and beyond the inconspicuous lunbonal ridge adorned with rather distant divergent ridges ; beaks prominent, nacre livid flesh-colour ; hinge-margin very narrow, only furnished with a transverse simple arched lamellar tubercle in each valve. Goi'LP \Anodoii and Pseududuii). Froc. Bost. Soc. N. H. vol. i. p. 160. Hnb. River Salwen, British Birmah. A typical form of the subgenus Fscndodou. UmoPl.XCV. Sowerby. del et hth VmoenLBrooks , Day iSon Imp U N I S[iecies 514. (Mus. Ilaiiley.) I Unio PAKMA. Un. tesld soUdd, ri'iilricnuii. urd/o-sii/n-or- \ datd, valde ineeqmlateraU, oUviici-o-J'uscu. Iiuinl niiiniUi, \ ad luiibones eminentes porcis aiir/nhirilinf^ brn-ibtix, etiamqve superne ad costam v.mhonalem cumpicuam cosluUs obliquk divergentibm ornatn, alibi rudh con- ! ceidrice subrugosd vel mblavigafd; margine peidrali subarcuato, antici acc/ivi ; area podicd dorsali siilco levi radiante indructd ; wargaritd subalbidd, siipcrui (iifi'O-o/iraci'O scepius fucatd; dentibiis cardinalibus vnlidis mbtrigonifi, valde laciniatis ; lamelUs lateralibm longis, curvntis. The buckler Unio. Shell solid, ventricose, ovate-sub- cordiform, very inequilateral, olive-brown, not rayed, adorned on the prominent iimboes with short angular ridg-ps, and upon the consp'icuous umbonal ridge witli divergent oblique riblets, elsewhere smoothish, or somewhat coarsely wrinkled concentrically ; ven- tral edge siibarcuated, rising in front ; hinder dorsal area w'ith a shallow radiating sulcus ; nacre whitish, usually stained above with yellowish-glive ; primary teeth strong, subtrigonal, much jagged ; lateral lamellaj long, curved. Benson (teste Theobald). Hab. Tennasserim, E. Indies. The beaks are too eroded to describe. The primary teeth are so cloven that they might almost be described as tlnre in each valve. There are traces of a larM lunule. Species 515. (Mus. Hanley.) o Bonne AUDIT. Un. ieatd obhmgo-elongald, crassiiis- cnld, mrigis iiiiinme renlricosd, siibitucqiiilalerali, in- fenii retiisd, viridi-liui>li-brown, with a deep furrow brliiiul llii- iiniliniiiil ridtce; ligamental edge very shun, Ventral margin arched in front, subretusely rising behind; hinder dorsal area narrow; beaks mnnded and pruniineut ; nacre bluish-white; hinge- margin broail and much curved ; front teeth strong, jagged or wrinkled ; hinder lamellK and Devii.le, Mag. Zool. 18.50, pi. 16. f. 1 ; Anim. IWnier. Sud (Exped. Oastelnau), Moll. p. 83. pi. 17. f 1. Hub. Upper Amazon. Spe (Mus. Urbi Mus. Brit.)- Unio GliAlt.\v.\N.\. Vii. trstd hand magna, crassd, ven- tricosd, vahh- iiun/ndiderali, rotnndato-ovali, fused concolore, alriis laniellaribus concentrice rugulosd, infenie arena! a ; latere poslico plicis 3 radiautibns Iqiinrnui superior e\l aihje'.liiir i porcato, ad e.rtremi- latein rotiiiidain .- iialihii>i valde eminentibiis, coidortis ; liintdd nulla; manjaritd albidd, nonnnnquam ruhro pallide lincid ; margine cardinali lalo ,- tnbercnlo curdiiiidi ill iitrdqiie valvuld nnico, coiii/iresso, ubtiisis- slinu : tuinellis laleralibus nidlix. UN 10.— Plate XCVI. The Guarayos Unio. Shell not large, thick, veiitrirose, very ine(|uilateral, rounded-oval, of a unilbrm brown, wrinkled by concentric lamellar striae, arched below ; liiiidi.T side ridged by two radiating folds, of which the upper is the narrower, ronnded at its extremity ; lieaks very pronunent, twisted; no lunule ; nacre whitish or tinged with pale red ; liiiige-margin broad ; in each valve a single cardinal tubercle, which is compressed and very blunt; no lateral lamellae. D'Orbigny {Uonocomlijla'd), Moll. Amer. Mcrid. p. (iU. pi. 08. f. 4 to 7. Hab. Guaravos, IVilivia. There are i\\ duh, .sulci bet iar fold Species 535. (Mus. Brit.) Unio Churgiulleanus. Un. testil tcnui, ili'jiresm (ml iiniLones nuhveiUricom), ohliqite ohmald, nnlwe perbreri ct mnximi courctalu, po-itice d'datntd et subalald, sitb- Itsvitjatd, luteo-mridi-chiercd, radiis vhx'titibiis paiwis lantum supra costam umbonalem subhumilem sparsim ornatd ; marijine rentraJi antice abrttpte et subrecte acclivi, postice scepius urcuaio ,■ nadbiis parvis, acutis, incUnatis, liaud eminentibus ; martjantd argenled, aliquando paululum nubrosfd ; dente cardinali parvo, imico, compresso, trigorw ; lamellis laUralibim nullis. Churchill's Unio. Shell depressed (at the umboes subveutricose), obliquely obovate, very short and peculiarly contracted in front, dilated and somewhat winged behind, nearly smooth, of an ashy greenish- yellow, merely adorned here and there with a feu- dark green rays beyond the scarcely elevated umbonal ridge ; ventral edge rising abruptly and sonjewhat straightly in front, usually arcuated behind; beaks small, acute, inclined, not prominent ; nacre silvery sometimes slightly pink ; cardinal tooth small, single, compressed, triangular; no lateral laraellas. BouuGiGNAT, Rev. et Mag. Zool. 1857 (apart as Arae- nites Malac. p. 35. pi. 2. f. 1 to 4). Hab. Anatolia. Almost a MonocondyUca. U N I . nbdiicta (Alasmodonta), Say . . LX. Aberti, Conrad XCll. acutissimus, Lea XXX \ I. ^gyptiacus, Cailland XXVI. aereus, Reeve XXX. Msopiis, Green VIII. affinis, Lea LXl., .'iUT. nil LXIII. Afrieaiius, Lea XXII. uheneus, ira XXXVI. Alabamensis {Margaritana), Lea LXXXII. alatus, Soy XLIV. Aleroiii, Jlousson XX\\ altilis, Conrad XXIII. ambiguus, Farreys L.XIX. aracjenus, Lea LXXIX. anaticulus, Lea XXXVII. Angasi, Lea LV. angustatus, Lea LXXII. Anodoiitoides, Lea XIX., 87, and XXI. apioulatus, Say III. aplatus, Swaiiison XXVIII. aquilus. Lea LX. aratus, Lea LXIV. arc8eformi.s, Lea XIV. arctior, Liea LXXXV. arcuatm, Bouchard Clianterenx XXV. arcula, Lea XLVIII. Ardimanns, Reynies XXV. argenteus, Lea XXXVII. asper, Lea V . asperatus, Lea LXXXV. asperrimus, Lea VI. Astieranus, Dupuy LXXXVI. a(er, Nillsou XXI. «i!er, Lea XXIV., 11.5, LI. atrocostatus, Lea LXXVII. airocoslatiis. Reeve IV. Ancklaiidicus, Gi-ay XXX. auratiis, Swahisou XXIX., 150, XLV. aureus, Lea LXXXII I. Haluiiiieiisi^, Conrad XVIII. Plale. Harnesianus, Lea XXXIV. Batavus, Lamarck XLIl. BerlaniUeri, Lea Will. bialatus, ic« XLV I. biangulatus, Zf« LXXX. bicaslatus, Reeve X.XVI. Bigbyensis, Lea .XLI. bilineatus. Lea LXXI. Blandianus, lea LXXVII I. Blandingianus, Lea XXXV. Bouellii, lirasmc LXXIX. Bonneaudii, Eydutix ....... \C\ . Boykiuiauus, Lea I. bn'ria/is. Crouch WVII. breriaV,^. Lamarok XXII. imvV/r,«-, Lra XiV. briiiiiieiKi, ISonhoinnic XXII. Bucklcyi, X™ XX XIV. Buddianus, Lea XX. buUatus, Rafi,iessms, Pfeiffer LXX IX. 414 dqnessus, Lanmrrk XVIII. SI Des/,„i/,'.sii. Michaud XXV. 123 dcviatus, .Uithomj XV. 61 digitiforniis, Soicerhy LXV. 333 ddataliiK, Conrad LXXIII. 379 XXVUI. XXXIV. 140 discrepans. Lea 176 LIU. LXII. XXXVIl. ■'75 310 dolabelloides, Lea 205 dolal)ra;fbnnis. Lea LIX. 298 dolo.us. Leu . XLI. 228 Thihiheiaiiiix, Vah'iiciennes . . . 11. 5 HoiKiciformis, Xw . XXXIX. 214 \y>.M\>vxnumuf.l)en]leaMd II,q ..- XCVI. 523 Dortruiliianus, Lea X. 38 I)ou;;-lasi;u, Cray XXXVIII. 207 Downei, Lea LXVIII. 350 UNIO.— INDEX. dromas, Lea VIII. Dunkerianus, Lee XC. Duttoniamis, Lea XCl. ebenus, Lea LXVI. Edgarianus, Lea XV. electrinus, Reeve XXV. elegans, Lea LXXIV. ellipsis, Lea ... LXXXI. ellipticus, Lea LXXIV. ellipticus, Barnes XLI. dongatnn, Lamarck LXXVl. elongatnlus, Foii, MiihlfM .... LXXXV. elongata (Mya), Wood XXVII. emarginatus, Lea LXVI I. Kvansii, Jdams LVI. excamdu-H, Lea LXXVII. uxiguus, Reeve XXXVIU. exiraius, I^ea LXX.KIX. faba, D'Orbigny XCllI. fabalis, Lea^.'. XXXVI. tabula, Lea LXXVl. falcata {Marganlana), Gonld . . LXXV. fallax. Lea .' LXXX. t'amelicus, Gould LXXV. fascio/iis, Eafinesque L.VX. fnvideiis, Benson XXVI. fhvosus, Zeff Xf '. tibuloidi-s, Lea XLI. Fisherianus, Lea XXIV. //rtr«s, Rafiiiesciue XXVIl. tlexuosus, Rafinesque VI., i2, ai XI II. tiiu-tigcv. Lea XLIl. fidialns, Hildretli VI. tnlHcMlaliis, Z™ XCL F.ni(;iin.anus, //0/-/>/;///// . . LXXXVll FoilK'sianiis, a™ LXXl. Fon-manianus, Lea XXXVll. formcus, Z(?fl LXVll. Forslicyi, Lea VI. fossiculifcrus [Monucijiidi/l,pa ) , D'OMipni XCVI. lV:i-,l:--. •V--„.,„ XXX. ./:■.' >■ .^ "11 xxxix. fni- .Mi^. (■„,,■„,/ VII.. n. ; I. fuligiiinsus. Leu LXVI II. fuligo, Reeve XXX. fulvus. Lea LXXXIX. fum-bnilis. Ijea \j\\ |. 29 4S.5 Vii 334. 65 \i\ 380 424 382 403 2 US 481 .50.5 190 3 'J 4 418 3 1)1 30(i 131 488 223 113 13(; 493 4(;i; 301 2U2 34U 21 346 159 483 290 fiiscatus, Lea XXI. GfM.Vf^M .? Philippi XXIX. Georgina, Lamarck LXVIII. Gesnerii, Lea LXXX IV. gibber, Lea XL. gibbosiis, Banies LXXIII. y'Mosns, Rafinesque XL gigas, Swainso,, LVI. glaber, Lea LXXXV. glahrala, Lamarck LXVIII. glabralns, Sowerby LXXVl. glans. Lea .. . ' XXXVl. glebulus, .% LXXIV. ,//.'W«.y, Ileeve XXlll. g'/o/josa, Lea XXVI. gracilis, Barne.s XXXIX. graiidide/is. Lea LXXXI 1 1. graniferus. Lea IX. graiiosus, Schumacher XXll. grains. Lea LXXXIV. gravidus. Lea Lll. gravis: (Mva), Woud XL. Gn.vanus! L-a XXV. Gniiiii, Co>,n,d XLVIl. Griffitbianus, Lea LXXXIX. G uarai ua nus ( Monocoiidgbea ) , D'Orbigny XCVI. Gnaranianm, r)'Orl)igny XCIIl. gubcrnaoulum, Reeve .'. XXVI 11. Giindlachi, L),nd-er XL VI. Haiuesianus, Z.» XLVll. Halcianus, Zm XXIV. Hanlcyauus, Zm XL VI. lLa,i!('i/aiii,s, Reeve XV 11. llay^iauns, iw XV. lLizlehiu>tianus, Lea XXXW Heenuannii, Lea LXXX 11 1. llembeli, Guirrad XXXllI. ber.,s. Sag ll._ lietiTodon, L^ea XXX\ . /iiaa.s, Valenciennes LXXVl. lligginsii. Lea LXXXII. Hilch-ethianus, Lea X\XVI. Iu|,p(,|xtns, Lea XL Uochstetteri, !)»«/,•»-/■ LXXXV I. Holstonensis, Lea LXXVl. llopetonensis. Lea LX\ 111. H,msei,Z6'« XLVIl 1. Iloustonensis, Lea L.KXXI, Hvdianns, iJeew, as of iw .. XXXVII. 150 346 446 219 379 41 287 452 340 399 190 381- 439 34 UNIO.— INDEX. hyhvus, D'()rtn(jinj XCI 1 1. 506 iclennm, Conrad LXXX IX. 483 incrassatiis, Lva, X.X \ I. \i1 incuri'iis, Lea XXII. 98 Imlicus, Sowc-rby XL. 322 uiflalus, Hecavt XXV. 1 24 inflatus, Lea XLV. 24G hiflatus, Barnes LVII. 29:5 infucatus, Conrad XL. 221 Ingallsianus, Lea XXVI. 12G inoniatus, Lea XXIX. l^T intermedius, rb»/W XI 11. 48 interniptus, yi«^'«('»/«c XI\ . 5(i inter nipt us, Say \. 17 invoUitus, B6'H.vo« XXXIV. 177 h-is, Lea XXIX. 148 irroratus, Lea XII. 44 Isocardioides, Lea XC. 484 Japaiiensis, Lea LXXX. 430 Javanus, Lea XC. 489 .Tavensis, Lea LX., :W\, and LXVIIl. 343 7,;/»,/,M. .Sowerbv (not Lea) ... LXXXVIII. 347 Kirlhuidianus, 'L;, LXXMI. 403 Kleinianus, Lea II. (! laclirymosns. Lea IX. 33 lacteolus, Lea LVII. 288 la3vissinnis, Lea XL\ I. 250 Lamarckianns, Tj:a XCIl. 495 lamellatns, Lea XCIY. 511 lametlatiis, ^owerhy LI I. 173 Lmnimyanw, Bahd a„d Artanis LXXXVII. KiO lanccolaUis, ira XLVII. 23(i Laosensis, Lea XLV! L 350 latissimus, Sowerlii/ LXVI. 337 Layardi, Lea XXXIII. 1 1 1 Lazarus. Lea LXVIIL 34.S Leoai, finn/ IX. 1 Lccoiilianus Z™ XXXIII. 173 leiii.H-. Lea XVII. 75 Inis, Lea XXVII., 134. all,! XXXVII. 3011 Iqitodoii, Conrad XLVII. 3.-.7 lienosus, t'otirnd LXX\'. 3Ss //V'//o.v«.v, lieeve XXX II. l(i(i liijanientinus, Lamarcl,- XL. 330 tiiiamenlmiis, Dcsliayes LXX. 30G //Ws7«. Xillson ..'. XXV. 133 Liii.l-I,yi, Zi. Maton LXX IV. Meiikpaiius, Z«/ XXVin. M,i,/,irMi, nn,,/ XXIX. inrrdirr. Walsh XXVIII, niotam'vn-. li„f,iie.,,ne VII. Mcxicaiius, ViriVipp, LV. micans, Lea XXXV, Micliandiaiinx, Pcsmonlins ... XXV. Jlinuanns, LfOrblrjm, XCI. Mississippieiisi.s, Conrad XIX. vwdiotifonnU, Say LXIX. ]\Iorctoniciis, Reeve XXIV. VIortoni, Conrad III. i\I()nhot.ianus, Lea XC^II. miicidiis, Moridrl XXV. Miihlf.ldiamis, Z™ XXXVII. ninitiplirntns. Lea II. nniUiradiatus, Lea LXX. nniltiradiat,,,, SdWcrhv LXI. nuiltistrialu.?, Lea .' LXXXV. w/W«.v. UtTve (nol Leal ... XVI, Mnrvliisonianns, Lea XXXVUI. liiulalMlis, Lru XXIV, ///«/»//«, ,M..iisM,n XC. Myersianus, Lea L. M;ilitoides, (Uiiiopsis), Suainsou LXXVI. //"«a, Lamarck XML Napcanensis, Conrad , , XXI II, NashvilU-anus. Lea XXX. "'i^'itus, ,^,y XX. NataVnsis, Lea LXXL, \m XCVI. 3S1 183 134 497 85 82 118 10 503 133 311 9 30R 30G 455 113 489 INIO.— IXDFA'. iiaviculoidts, Leu LX. iiavifonnin, Lninarck ]>X. navioliformis, Lea XXIV. nebulosnn, Conrnd XXIX. negatus, Lea .X.XXII . neglectus, Lea ]A\' . >iw.% S,,y XIV. Xiokliiiia'uus. Lea LIll. uiger, Com-ad LXXVIII. Nilotieus, CaiUaiid LX X X 1 1 1 . nitens, Lea X.W 111. noctitnius. Lea L\ 1 \. iiodosiis, Barnes ^ H . iiodiferus, Conrad XIII. iiodulatus, lliifiiiesque XIII. nodulosus [Mijfi), Wood LXXXIII. «w/«/mv,,v. Kr.w IX, X.ni.i:'..,:..-,. L. XXXYIII. Ulirlr„|,Mv rn,n-a,l XV[. mi.\.-Persica, hunker LXXIII. Nyasseiisis, Lea X LI, ob,.sns, Lea XVIII.. 84, XXXV 111. (.liliquiradialns, U.eve XXIX, ohium, Dcsliayes LXXI. obtusus, Lea XXVI. oppatus. /iffl , , , ; LXXIX. '"■Inarrus, .% LXIII. ■ilivarrus, L,;, XXXVI. orbiciilatus, //;W/W/< XLIV. Orbignianus, Bevllk and Ilnpe XCM. OregoiH'iisis, Lea LXXIV. owns, Lea LXIII. Orientalis, Zm XL'I. oniatiis, Conrad XXXI. Osbeckii, PJdlipjn LXIX. ovaJix, lletz XXV. ovala (Mysca), Tnrlon XXV. ovatus. Say XXXI. raraguavanus, i)'0;-i,V/Hy .... LII. parallelopipedon, Lea . LX.XXl.X, Faninensis, Lea LI. parnia, Benson XC\'. Parreysil, Von Buscli LXXIII. parvns, Barnes XXXV. Patagonicus, D'Orbigny XX. Fazii, Lea XCII. per/orosiis, Conrad LXIX. I'egnensis, .Inthony XCV. pellis-scrpentis, Bunker LXXXVI. 3(10 lU lis lf,,i 57 370 47 01 4:i'.i ■■',i 200 08 37.". 234 412 317 li»3 523 383 314 491 103 353 124 124 104 273 47S 208 514 374 ISG !)3 503 pcllucidns, Lea XXXV, ptMiitns, Conrad XIV, pcrieforniis, Lea LXXXIV. perroarptafns LIV, Pmlix, Lea LXIX, perdiv, Heevc XVllL IVarlensis, Conrad XL pmiod„Mi., Lea XII, pcrovalis, Conrad XXXV 1 II. peqilexn.s, Lea XI. perplicalnis, llfeve IX. personatus, Say XV. perstriatus, Xra XCII. persn/ca/ns, Lea XLVI. Perni-ianM, Lamarck li. phaseolus, Jlildreth LXXIII. PhiUlppii, Dupny XXV, Plullippsii, Conrad IV, Plant-n^sk, Farines XXII. pirtoruni (Mya), Linnans XXV. piclns, Lea LXIII. piger, Lea LXXIY. pilaris, Zra XXVII. pileus, Lea XIV. Plantii, Lea LXXXVIIL plannUdns, Lea ,. LXXIII, platyrrIiynelin5,7?osswrts.s/(-;- , . . XX.X. Ijlatyrrliynclioideus, Dupny . . . LX.X, plenVs 'Leu " LXI, /Vra».y, Conrad LXXV. plicatulns, Lea XXII. plicatns, Lesseur II. plieil'erns, Lea '■ LXXV. p/ic!fern.s, Reeve X. plurniea (Chaina), Chemnitz . LXXXIII. Poeyanus, Xm XC. po/ilns. Say XXXII. punderiixHx, Spitz XXV. Popei, L.ea LXXXI. Postcllii, Lea XLVI I. Poulsoni,r,;„m(/ LI. Povvillii, Leu LXX. praelongus, Barnet XIX. pras'uuts, Reeve VII. Prevostianns, Ze« LXIII. producing, Monsson XCI. propinqnus, Lea LXXIX. psaniinur/hmi, lironn LXXIV, psannnoieiis, B'OrljIgny XCIIl. pndieus. Leu ' LXXXI, 443 277 83 82 42 40 209 41 378 123 15 154 358 305 387 102 387 37 439 480 lOs 123 430 270 3,59 UNIO.— INDEX. pugio,Be„son XCV. 51(5 pullatus, Li^a LXVI. 335 pumilis, Zieghv LXXIII. 374. pumilis, ira XXXVI. 198 purpurascens, Lamarck LXVIII. 346 purpuratus, Lamarck XXIV. 115 purpureus, Say LXVIII. 346 pitatidata (Tlicliderma), Swaiii- son I- 4 pudulosiis. Lea XII. 43 pyramidatus, Lea LXIV. 323 qiiadrulus, Rajinesqne VI. 24 ;-ao?/a^ff (Uuiopsis), Swainson . . LXXVI. 396 radiatiis {Mya), Gmelin XXVII. 139 Eangiamis, Lea XIV. 54 rariplicata, Lamarck II. 5 ravistelhi.s, Morelet LXXII. 366 Raveneliamis, Lea XVI. 70 rectilinearis, Soicerby LXV. 333 rectus, Law.arck XIX. S6 rt^twx?,, Rqfiiiesque VI. 23 resiularis, Lea LXVIII., 351, and XXXIV. 181 rm\ionm%, Sckmiiit LXXII. 371 retioulatus, JfoWcflW LXXXVI. 458 retusiis, Lamarck LXXI. 363 rhomboides, Zf;a LXXXIX. 480 rJwmboidea (Mya), SchrOter . , XXII. 98 rkombiila, Lamarck LXVIII. 346 Rh.uacoica (Monocondytea), D'Orbigny ' XCIII. 505 Kiddellii, i?a LXXXIII. 443 ridibundus. Say XV. 03 Roanokensis, Lea LXVII. 341 Roissyi, Midland LXII. 311 rosiraia, Studer XXV. 124 fosirala, Lamarck XXY. 123 rostrata, Valenciennes XVI. 94 rotundatus, Lamarck LXXIV. 384 rotundatus, Eeeve X.KIII. 106 rotundus (Diplodoi/), Spl.c .... LXXII. 379 rotundus, Moricand LXXXVI, 467 TJoiwii, Dupuy XXV. 123 Rowellii, Lea LXXXVIII. 471 rubellianus. Lea X(.'. 490 rubiginosus, Lea XXVII, 136 rufusculus, Lea LXXIII. 377 rugosus, Barnes LX. 302 rtigosvs (in part), Barnes .... VII. 25 j-K^M^M (Mya), Wood LI. 267 rusticus, Soicerby (not Lea) . . LXIV. sacculus, Anthony XV. sagittiformis, Lea XCII. sagrinatiis, Sowerby LXVII. Salmenianus {Anodon), Gonld . . XCH . Sandrii, Villa LXXIX. Sapotalensis, Lea XCI. satur, Lea XCII. Sayii, Ta.ppan LXX. scalenia, Ilafinesque LXIX. Schoolcraftensis, Len 1. Schwavtzenbacliii, Rossmiisder XLIV. scobinatus, Lea LXIII. scnlptilis (Alasmodon), Say . . LXXVI. scutum, Benson XCIV. securis. Lea LXI. semiffranosns. Reeve X. semicjuadratus, Soicerby XLVIII. semirugata, Lamarck XXII. Shanghaiensis, Zm XX. Sliepardianus, Lea X,X. Showalterii, Lea LXXXI. Slmttleworthi, Lea XXXII. Siculus, Swainaon LXXI. Sikkimensis, Lea LXXVI. slUquoideus, Barnes LVIII. sinuatus, Lamarck LXII, Soleniformis, Lea XLV. soUda (Mysca), Turton XXV. solidus, Lea XXVII. Solisianus, D'Orbigny XCIII. sordldus. Lea LXVIII. Sowerbianus, Lea XIV. sparsus, Lea IV. spatludatus, Lea LXV. speciosus, Lea LXXXIV. Spilbnaiinii, Lea LXXXII. spinosus, Lea XLIX. spissus, Lea LXXXVIII. splendidus. Lea XXXI. spuria (Mya), Gmelin LXXI. stapes. Lea XIII. stegarius, Rafnesqne XII. Stewardsoni, Lea XV. Stonensis, Lea LXXXVI. stramineus, Conrad LXXX. stramlneus, Reeve XXXIX. striatissiraus, Anthony LXXXVI. striatuhis, Lea LXXII. striatus, Lea LXXVIII 324 67 499 345 513 413 495 501 350 82 3 241 313 399 510 304 36 258 98 96 426 167 364 400 293 311 243 124 133 507 346 58 14 328 447 435 261 470 06 402 422 UNTO.— INDEX. .«//■(«/««, Ratiuesque YIIJ. :J0 Stiuu-ti, A,l,n,is (u,d Aw/as .... LIV. and LV. 27^1 sub;iu,2ulatiis, Lea . . .'. LXV. 327 sul-luhosus, Zc« LXIV. 321 subovatus, Li-a LXXXV. 456 suLovaiiii, Reeve XXXI. 1 G3 subplaiius, Conrad XLVII. 2.")2 subrostratus. Reeve (not Say) . . XVII. 78 subrotundus, Lea XXVII., 137, and XXXVII. 201 subtentus, % LXXIl. 370 subtetragona, Michaud XXII. 9S subtortus, Baird and Adams . . LXXXVII. 46.5 siibtrigonus, Sowerby LA^III. 202 .