34 



SANGUINOLARIA FUSCA. 



Tab. VII^ fig. 1. 



SPECIFIC CHARACTER. 



Shell compressedj subovate, generally thin, con- 

 centric lines rather prominent; anterior side obtusely 

 rounded, and nearly closed ; posterior side narrowed 

 and gaping a little, with a slight submarginal wave ; 

 beaks central; teeth, two in each valve, one of which 

 is bifid. 



SYNONYME. 



PsAMMoiJiA FuscA, Say, Journ. Acad. JVat, Scien- 

 ftr CCS, vol. 5, p. 219. 



Cabinet of the Acad. Nat. Sciences, No. 886. 



OBSERVATIONS. 



This shell is white or reddish and covered with a 

 pale yellowish or fuscous epidermis. 



Inhabits the estuaries of Georgia. Say. It is not 

 uncommon on the coasts of New Jersey, New York 

 and Rhode Island, burrowing in the sand. I have 

 observed it in the Potomac river where the water is 

 brackish. 



