GHIEFLY OF THE UNITED STATES. 25 



Hah. — Stewart's Mill Dam, Union County, North Carolina", C. M. Wheatley. 



Cabinet of Mr. Wheatley. 

 Diam. 2-2, Length 2-8, Breadth 4*7 inches. 



Shell smooth, oblong, very much inflated, nearly equilateral, obtusely biangular 

 behind, obliquely rounded before ; substance of the shell thick, slightly thicker 

 before; beaks prominent and very much inflated; ligament large and dark brown; 

 epidermis yellowish green, very much rayed and shining and with two very distant 

 marks of growth; umbonial slope very much raised and obtusely angular; posterior 

 slope very wide, somewhat carinate and nearly covered with dark green rays ; 

 anterior cicatrices confluent, very large and very slightly impressed ; posterior cica- 

 trices confluent, very large and very slightly impressed ; dorsal cicatrices not percep- 

 tible ; cavity of the shell very deep and very wide ; cavity of the beaks very deep and 

 subangular; nacre very pale flesh color and very iridescent. 



Remarks. — A single specimen only of this fine large species was procured by Mr. 

 Wheatley. This is greatly to be regretted, as the description made from an indi- 

 vidual may not give all the true characters of the species. It is more quadrate than 

 any other of our species with which I am acquainted, — more so than tetragona, 

 (nobis,) — and none are more inflated. The specimen before me has a pale flesh- 

 colored nacre, changing towards the border to white, the posterior edge beyond the 

 nacre being a dark salmon red. This disposition of colors may not prevail in all 

 cases. The beaks are not perfect enough to observe any undulations of the tips. 

 From the same habitat was received a large and fine specimen of gigantea, (nobis,) 

 but that species is quite difierent in outline and other characters. ^ 



Anodonta Leonensis. PL 9, fig. 24. 



Testa Isevi, elliptica, inflata, inaequilaterali, postice subbiangulata, autice oblique rotundata et aliquanto 

 sulcata; valvulis tenuibus, antice aliquanto crassioribus ; natibus prominentibus, tumidis, ad apices 

 nodosis; epidermide fulgida, luteo-virente vel fuscescente vel obsolete radiata vel eradiata; marga- 

 rita casruleo-alba et valde iridescente. 



Shell smooth, elliptical, inflated, inequilateral, subbiangular behind, obliquely 

 rounded and somewhat sulcate before; valves thin, slightly thicker before; beaks 

 prominent, swollen, nodulose at the tips; epidermis polished, yellowish green or 

 brownish, obscurely radiated or without rays; nacre bluish white and very irides- 

 cent. 



Proc. Acad. Nat. Sci., 1862, p. 169. 



Eab.— Leon County, Texas, Lieut. E. F. Beale, U. S. Army. 



My cabinet and cabinet of Smithsonian Institution. 



Diam. 1-5, Length 2, Breadth 3-5 inches. 



Shell smooth, elliptical, inflated, inequilateral, subbiangular behind, obliquely 



7 



