84 NEW YORK STATE MUSEUM 



Pennsylvania. 



Philadelphia Coll. Phila. Acad. 



Delaware. 



Marsh. 



Maryland. 



Marsh. 



District of Columbia. 

 Potomac river Sterki. 



Virginia. 



Alexandria Sterki. 



Apparently confined to the eastern drainage system. 



Unio ovatus, Say. 



Ontario. 



Hamilton bay . . , Leslie (as subovatus), 



Ottawa Latchf ord * 1 



Pennsylvania. 



Allegheny river, Warren Beecher. 



Ohio. 



Little Miami river Walker. 



Ohio river. Anthony. 



Whetstone river, Delaware Beecher. 



Kentucky. 



Marsh. 



Tennessee. 



Cumberland river Hinkley. 



Alabama. 



Marsh. 



Occurs in the St. Lawrence and Mississippi drainage system. 



Unio parvus, Barnes. 



New York. 



Erie canal, Onondaga county Beauchamp. 



Genesee canal Wright. 



Ohio. 



Miami canal Beecher. 



Ohio river system Sterki. 



Michigan. 



Rouge river, Wayne county Walker. 



