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. 



