U N I 



Species 243. (Mus. Lea.) 



Uxio SOLENIFORMIS. Un.testd angusto-ellipiicu, arcuata, 

 sitbcoiiipressa, vulde inaquilaleraU, iutiis albido-caru- 

 lescenti, extus lavigatd, concetitrice subrugatd, epider- 

 mide fused, latere aniico brevi, term'me rotundo, latere 

 posiicd elongato, marij'me dorsali subarciiatim declivi, 

 termiiie oblique subtruncato, marglne tentrali medio 

 arcuato. 



The soleniform Unio. Shell narrow-ellipticul, arched, 

 rather compressed, very inequilateral, within bluish- 

 white, without smooth, slightly couceutrically wrin- 

 kled, with brown epidermis, anterior side short, 

 rounded, posterior side elongated, with dorsal margin 

 arched, sloping downwards, the end obliquely sub- 

 truncated, ventral margin arched in the centre. 



Lea, on Unio, vol. i. p. 98. 



Hub. Ohio Eiver. 



The form of this shell resembles that of an elongated 

 kidney-bean. 



Species 244. (Mus. Hauley.) 



Unio viridis. Un. testa ovatd, subinflatd, intus albido- 

 siibvirldl, extns lavigatd, olivaced, postice virldi, line- 

 atim radlatd, radils subdlvisis, latere aiitico brevi, au- 

 gusto, latere postico lata, oblongo, oblique truncato, 

 ■marglne dorsali siibelevato, margine ventrali convexd, 

 umboHibus tubercuUs magnis angulatim undatis rvgatis. 



The green Unio. Shell ovate, rather inHated, greenisli- 

 white within, smooth, olive without, posteriorly line- 

 arly rayed with green, rays subdivided, anterior side 

 short, narrow, posterior side wide, oblong, obliquely 

 truncated, dorsal margin rather elevated, ventral mar- 

 gin convex, umboes wrinkled with large, angularly 

 waved tubercles. 



Conrad, Monograph. 



Vtiio Tappaidanus, Lea. 



Hab. HaUidaysberg. 



Species 245. (Mus. Hanley.) 

 Unio aukatus. Un. testa oblongd, subinjlatd, tenui, in- 

 tus infra mnbones iiuratd, dentibus cardinalibus in 

 utrdque valvd iino, crenato, extus aured virldi radiatd, 

 postice virldi, latere antico brevi, subquadratim ro- 

 tnndo, latere postico oblongo, oblique truncato, mar- 

 glne dorsali subelevato, rectiusculo, nmbonibus tuber- 

 cnlix elongatls angulatim divergentibus rugatis, mar- 

 gine ventrali rectiusculo. 

 The gilded Unio. Shell oblong, subinflated, thin, 

 gilded within under the umboes, cardinal teeth one 

 in each valve, crenated, gold-coloured without, rayed 

 with green, the posterior part green, anterior side 

 short, rather squarely rounded, posterior side oblong, 

 obliquely truncated, dorsal margin rather elevated, 

 rather straight, umboes ^n•inkled with elongated tu- 

 bercles angularly diverging, ventral margin rather 



S'WAINSON. 



Ilab. Soutli America. 



Uni 



Species 24fi. (Mus. Lea.) 

 FLATUS. Un. testa subcuiieiformi, syinpln/iivtd, 

 compressd, intus violaced, dentibua cardinalibus subla- 

 minatis, in utrdque valcd una, dentibus lateralibus 

 elongatls, ad terininos laminatis, extns hevigatd, epider- 

 mide fused, latere postico lato, margine dorsali in alam 

 latum elevatam snbtrigonam producto, latere antico 

 brevi, margine dorsali in alam parvam producto. 



The INFL.4.TED Unio. Shell subeuneiforra, symphynotc, 

 compressed, violet within, cardinal teetii subiami- 

 nated, one in each valve, lateral teeth elongate, lami- 

 nated at the ends, smooth without, with brown epi- 

 dermis, posterior side wide, with the dorsal margin 

 produced into a wide elevated subtrigonal wing, an- 

 terior side short, with dorsal margin produced into a 

 small wing. 



Lea, on Unio, vol. i. p. liH*. 



Hab. River Alabama. 



Of the three bialate species this is the most cuneil'urm, 



having the short side narrow. 



August, 



