CYRENA CAROLINExXSIS. 



DESCRIPTION. 



Shell cordate, turgid, brown on the disks, with a yel- 

 lowish or greenish margin and submargin; surface with 

 numerous membranaceous wrinkles; umbo much eroded; 

 beaks distant; two of the primary teeth canaliculate at 

 tip. 



SYNONYMS. 



Cyrena carolinensis. Say. Nicliolsoii's Encyclopedia, 



(3d American edition,) article Conchology. 

 Cyclas carolinensis, Bosc. 



observations. 



Inhabits the rivers of South Carolina and Georgia, 

 but is not found so far north as New Jersey. We found 

 it in plenty near Charleston, South Carolina, and in St. 

 John's river, Florida. — Say. 



It inhabits Mobile Bay, in the vicinity of Mobile, Ala- 

 bama, and occurs fossil in the Newer Pliocene of North 

 Carolina, near Newbern. — Editor. 



PL 02. 



