NEW FRESH WATER AND LAND SHELLS. 247 



Unio Haleianus. Plate 27, Fig. 63. 



Testa ellipticd, subinflatd, incBquilalerali; valvulis sublenuibus ; nalibus prominulis, ad apicem un- 

 dulatis ; epidermide tenebroso-fuscd, striata ; dentibus cardinalibus magnis, compressis, lateralihus longis 

 subcurvisque ; margaritd alba et iridescente. 



Shell elliptical, subinflated, inequilateral; valves rather thin; beaks rather prominent, undulated at the 

 tip; epidermis very dark brown, striate; cardinal teeth large, compressed; lateral teeth long and somewhat 

 curved ; nacre white and iridescent. 



Hab. Mississippi River, thirty miles above N. Orleans. Josiah Hale, M. D. 



My Cabinet. 

 Diam. .1, Length 1.5, Breadth 2.8 inches. 



Shell elliptical, rather inflated, inequilateral, with a thin, depressed line from 

 the beak to the posterior margin ; substance of the shell rather thin ; beaks 

 rather prominent, with nearly concentric undulations at the tip; ligament 

 rather long and thin; epidermis very dark brown, nearly black, striate in thin 

 laminae on the inferior portion of the valves; cardinal teeth large, compressed, 

 elevated, disposed to be double in both valves; lateral teeth long, somewhat 

 curved and lamellar; anterior cicatrices distinct; posterior cicatrices confluent; 

 dorsal cicatrices placed across the centre of the cavity of the beaks; cavity of 

 the shell rather deep; cavity of the beaks shallow and subangular; nacre 

 pearly white and iridescent. 



Remarks. — This shell is of a very regular ellipse, and has more resemblance 

 to the U. parvus, Barnes, than any other species with which I am acquainted. 

 It is, however, much larger, being quite four times the size of the largest 

 parvus I have seen from the vicinity of New Orleans, where they occur largest. 

 Its beaks have nearly the same kind of undulations. A single specimen was 

 given to my brother T. G. Lea by Dr. Hale of Alexandria, Louisiana, after 

 whom I name it. This specimen is now in my Cabinet. I do not know if 

 Dr. Hale got other specimens. 



Unio Foremanianus. Plate 27, Fig-. 64. 



Testa triangulari, compressd, incBquilaterali, postice angulatd, ad latera planulatd ; valvulis crassis; 

 natibus prominentibus ; epidermide luted, valde radiatd; dentibus carditialibus crassis, lateralibus 

 crassis rectisque; margaritd albd. 



VIII. — 3 N 



