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)ri<//atd ; oliouceo-hUexceiite, viridi 

 copiose radiatim. lineari-viltatd. 



The hounded Unio. Shell broadly elliptic, rather thick, 

 anterior side slopingly rounded, posterior obliquely 

 broailly truncated, obtusely angled, swollen at the 

 angle, coarsely plicately wrinkled in the middle ; 

 olive-yellow, copiously radiately linearly lilleted with 

 green. 



Lamarck, Anira. sans vert. vol. vi. p. 5o8. 

 Unio snborbiculatri , Lamarck. 

 Unio globulus. Say. 

 Unio subfflobosus, Lea. 



/l:ib. North America. 



Kull of striking details of character, but little deserving 

 ol' the name siven to it. 



Species 107. (Mus. Cuming.) 



• 10 CUNEOLUS. Uu. testa subtriffoiio-cuuei/ormi, crassd, 

 latere antico brevissimo, subrecfo, postico obtuse oblique 

 augulato ; fulvd, viridi post iei macnlatd. 



!■: LITTLE WEDGE Unio. Shell somewhat trianguhuiy 

 wedge-shaped, thick, anterior side very short, nearlv 

 straight, posterior obtusely obliquely angled; ful- 

 vous, posteriorly blotched with green. 



Lea, Trans. Amer. Phil. See. 1>1(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." 



