Miscellaneous. 301 
more distinct rays, and is proportionally longer ; the cardinal tooth in 
the left valve is longer and less lobed, and the lateral teeth are 
straight, without granules, and less oblique than in the preceding 
species, which is a larger shell. 
U. oratus. Widely elliptical, ventricose, gaping at both ends; 
posterior gape wide; anterior extremity rather acutely rounded ; 
posterior margin sinuous, extremity subangular ; basal margin form- 
ing a nearly regular curve; summits prominent ; umbo and beak 
eroded ; epidermis ochraceous, polished ; cardinal teeth compressed, 
oblique; lateral teeth straight; within white, much stained with 
waxen yellow. 3}. 
Inhabits Flint River, Georgia. 
This shell has the polished epidermis of U. cariosus, but is with- 
out aray. It is longer in proportion than that species, with very 
different cardinal teeth, which are much nearer parallel with the 
margin aboye; the shell also gapes far wider in the only specimen 
I have seen. 
U. rosaceus. Widely elliptical, ventricose above ; posterior mar- 
gin obliquely truncated, slightly sinuous; extremity subangular or 
acutely rounded ; epidermis ochraceous and dark brown ; rays indi- 
stinct, frequently broad, but composed of fasciculi of lines; surface 
with fine radiating wrinkles; within deep rose-purple ; cardinal 
teeth prominent, oblique, compressed, trifid, or three teeth in the left 
valve. 3%. 
Inhabits Savannah River. 
Allied to U. ochraceus, Say. 
U. contrarius. Elliptical, moderately thick; valves somewhat 
flattened or plano-convex; umbo and beak not prominent, much 
eroded ; umbonial slope acutely rounded; posterior margin straight 
above, truncated, direct; epidermis deep ochraceous, with linear 
radiating wrinkles, and obscurely rayed about the umbo ; within pale 
flesh-colour stained with waxen yellow; cardinal teeth direct, thick, 
sulcated, not very prominent; lateral teeth reversed, or the double 
tooth in the right valve. 3 1-5. 
Inhabits the Ogeechee River. 
U. nucleopsis. Obtusely subovate, slightly oblique, thick, not 
ventricose; umbonial slope rounded; posterior slope with a few 
obscure plaits ; posterior margin subtruncated ; basal margin slightly 
tumid near the middle ; epidermis ochraceous, with a series of green 
spots along the umbonial slope ; posterior slope obsoletely striated ; 
within bluish white; cardinal teeth thick, direct, single in the right 
valve. 11. 
Inhabits Etowah River. 
U. limatulus. Subelliptical, convex; posterior side somewhat 
pointed ; umbonial slope angular ; posterior slope subcarinated in the 
middle ; posterior margin obliquely truncated ; extremity truncated, 
direct; basal margin regularly rounded; beaks not prominent, eroded; 
epidermis highly polished, dark brown and ochraceous, obscurely 
