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"-. 



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 



