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<led, ventral margin rather 

 straight, umboes smooth, not prominent ; anterior 

 side narrow, short, rather rounded. 



Lea, Obs. on Unio, vol. ii. p. y. |)1. 4. f. 9. 

 Unio auratus. Lea ? 



Hab. Roanoake. 



Species 348. (Mus. Taylor.) 



Unio Lazarus. Un. testa angustd, compressd, siilnirci- 

 atd, subrugosd, fused, intus purpured, de/dibus eras- 

 siuscnlis ; latere postico producto, ohscurissinie bian- 

 gulato, margine dorsali arcnato, declivi, inter angulos 

 truncato, margine ventrali ante tennuiuiti >'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. 



