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. 



