248 DESCRIPTION OF 



Shell triano-ular, compressed, inequilateral, angular behind; valves thick; beaks prominent; epidermis 

 yellow, much radiated; cardinal teeth thick; lateral teeth thick and straight; nacre white. 



Hab. Coosa River, Alabama. Dr. Brumby. 



My Cabinet, and Cabinets of Dr. Foreman and Dr. Brumby. 

 Diam. .7, Lengtli 1.2, Breadth 1.6 inches. 



Shell triangular, compressed, inequilateral, angular on the umbonial slope 

 and flattened on the sides; substance of the shell very thick, thinner behind; 

 beaks very prominent and angular; epidermis yellow with numerous capillary 

 wavy rays; ligament short and thick; posterior slope slightly elevated; cardi- 

 nal teeth thick; lateral teeth short and straight, the plate between these teeth 

 being abruptly arched; anterior cicatrices distinct; posterior cicatrices distinct; 

 dorsal cicatrices placed under the plate posterior to the cardinal tooth; cavity 

 of the shell shallow and angular; cavity of the beaks very shallow and angu- 

 lar; nacre white. 



Remarks. — This is an interesting species somewhat allied to V.formosus, 

 and V. securis. It differs from the former in being more compressed, and in 

 having capillary rays, — from the latter in not being so much compressed, and 

 being destitute of the catenoid rays. I owe to Dr. Foreman's kindness the 

 examination of two specimens which he received among other fine shells from 

 Dr. Brumby, of Tuscaloosa, Alabama. Neither of the specimens are perfect 

 enough on the beaks to ascertain what kind of undulations they may have in 

 a perfect state. The older and more worn specimen is by no means as trian- 

 gular as the other. The capillary wavy rays cover nearly the whole disk. 



Anodonta Dunlapiana. Plate 27, Fig. 65. 



Testa ellipticd, inflatd, subcylindraced, transverse vittata; valvulis tenuibus; natibus prominulis, un- 

 dulalis; ejndermide nitidd, luteold, obsolete radiatd; margaritd albd et iridescente. 



Shell elliptical, inflated, Eubcylindrical, transversely banded; valves thin; beaks slightly prominent and 

 undulated; epidermis shining, yellowish, obsoletely rayed; nacre white and iridescent. 



Hab. South Carolina. Mrs. Dunlap. 



My Cabinet, and Cabinet of Mrs. Dunlap of Salem, Mass. 

 Diam. 1.5, Length 1.6, Breadth 3.4 inches. 



