CYTHEREA ALBARIA. 



DESCRIPTION. 



Shell transversely oblong-ovate, inequilateral, wrinkles 

 of grov^'th more obvious tow^ards the margin, somewhat 

 polished, with a slight appearance of rather broad, nu- 

 merous radii ; beaks a little prominent in consequence of 

 the concave curvature of the posterior dorsal margin ; lu- 

 nule rather large, impressed, distinct, oblong-cordate ;/}os- 

 feriorside prominent: cmterior dor aal margin slightly ar- 

 quated, depressed, towards the beaks obtusely carinated on 

 the submargin ; anterior tip narrowed and rounded ; 

 u?27Am, margin simple; fossd of the posterior tooth siin 

 pie. 



OBSERVATIONS. 



This fossil shell was sent to me by the late Mr. Stephen 

 Elliott who informed me that it was found on the banks 

 of the Santee river, below the coniluence of the Congaree 

 and Wateree rivers in South Carolina. It is proportion- 

 ally broader than C. lilacina, Lam., and much less broad 

 than C. gigantea, Gni. of Florida. The specimen is very 

 much thickened within on the inner side of the palleal 

 impression, which is deeply sinuous anteriorly. 



REFERENCE TO THE PLATE. 



Dorsal and exterior views of a valve. 



