U N I 



Species 334. (Mus. Sowerby.) 

 Unio ebenus. Uh. testa, ohliqm mhquadratd., crasna, 

 tumidd, fusco-nigricante, concenirice ngatd, rugis 

 snbnodosis, intu.1 alba aut salmoned, dentibus crassis ; 

 latere podico relate oblique producto, mnrginibus dor- 

 sali et laterali amiafis, itmbonibus anliee teni/iiialibiis, 

 prominentihun, acuminatk ; latere aittico brerissimo, 

 margine laterali perpendiculari, margiue dor^uli bre- 

 vissimo, ante nmboiies excavato. 

 The ebony Unio. Shell obliquely subqiuulrate, thick, 

 tumid, blackish - brown, concentrically wrinkled, 

 wrinkles subnodose, inside white or salmon-tinted, 

 with thick teeth ; posterior side obliquely produced 

 when full-grown, dorsal and lateral margins arched, 

 umboes terminal in front, prominent, acuminated ; 

 anterior side very short, lateral margin perpeudicidar, 

 dorsal margin very short, excavated in front of the 

 umboes. 

 Lea, Obs. on Unio, vol. i, p. 9-1. pi. 0. f. U. 

 Hab. River Ohio. 



The small specimen figured by Lea is of a comparatively 

 rounded-square form ; but the larger the growth of the 

 specimen, the more the posterior part is obliquely pro- 

 duced and flattened. 



Species 335. (Mus. Taylor.) 



Unio pullatds. Un. testa oblongo-cyUndroced, crassd, 

 tumidd, lavigatd, tiigrd, iiitics sabpurpured ; latere 

 postico oblique arigulato, aiigulo elevato, margi/ie dor- 

 sali rectiitsculo, cimeato, laterali perobliqno, terminu 

 subrotundo, medio complanato, margine veiitrali recto ; 

 latere antico brevi, umboriibus Jiaud prominulis. 



TiiR SABLE-SUITED Unio. Shell oblong-cyliudrical, thick, 

 tumid, smooth, black, p\irplish within ; posterior side 

 obliquely angular, angle elevated, dorsal margin 

 rather straight, cuneate, lateral margin very oblique, 

 end rather rounded, middle flattened, ventral margin 

 straight; anterior side short, nniljocs not prominent. 



Lea, Obs. on Unio, vol. vi. 



Hub. TJivcr Georgia. 



Species 335. (Mus. Taylor.) 



Unio cunuNus. Un. testa oblongd, suburcHidd, solidn, 

 fusco-olivaced, conreiUrice fasciatd, inlits siibcupred ■ 

 latere postico iiillaln, vix angulato, prope margiiiem 

 ilorsalem radialim depresso, margine dorsali arcuato, 

 termino latii rottnido, medio depresso, margine ventrali 

 contracto, umlionibii>i priniiinnlis, kevigatis ; latere an- 

 tico brevi, subqiiadralo. 



The coppery Unio. Shell oblong, slightly arched, solid, 

 brown-olive, concentrically banded, copper-eolourcil 

 within ; posterior side inflated, scarcely anguhr, ra- 

 diately depressed near the dorsal margin, dorsal mar- 

 gin arched, end widely rounded, middle depressed, 

 ventral margin contracted, umboes rather prominent, 

 smooth ; anterior side short, subquadrate. 



Le.\, Obs. on Uuio, vol. i. p. l(t+. pi. 1:2. f. 2i. ■ 



Hub. Mexico. 



Species 337. (Mus. Sowerby.) 



Unio i.atissimus. Un. testd subcompressd, utrinqnehinnti , 

 rutnndo-subtrigond, lfpmgatd,fusco-olivaced, inliis albd, 

 partim paUidissime rosed, margine cardinali medio ex- 

 cavato ; latere postico latissimo, elecalini angulato, li- 

 gamento ma.rimo, margine dorsali recto, cuueato, late- 

 rali declivi, margine ventrali late sursum acclivi ; 

 latere antico angustiori, margine dorsali depresso, de- 

 clivi, termino subacuminuto, umbonibiis prominentibus, 

 angulatis. 



The very wide Unio. Shell subcomprcssed, gaping 

 on both sides, rounded-subtrigonal, smooth, brown- 

 olive, white within, partly very pale rose, cardinal 

 margin excavated in the middle ; posterior side very 

 wide, with an elevated angle, ligament very large, 

 dorsal margin straight, cuneate, lateral margin sloped, 

 ventral margin with a wide slope upwards ; anterior 

 side narrower, dorsal margin depressed, sloped, sub- 

 acuminate at the end, umboes prominent, angular. 



Sowerby. 



Hab. United States of .Vmorica. 



The outline of this species resembles Unio dolahrafor- 



mis and others, but the shell is much more flat. 



Janunrv, ISfiS. 



