66 



NEW YORK STATE MUSEUM 



Michigan. 



Detroit river Walker. 



Illinois. 



Wabash river Hinkley. 



Mercer county » Hinkley. 



Wisconsin. 



Marsh. 



Iowa. 



Mississippi river, Davenport Walker. 



Muscatine Walker. 



Kentucky. 



Marsh. 



Tennessee. 



Nashville Hinkley. 



Occurs in the St. Lawrence and Mississippi drainage area. In 

 New York, so far as known, the species is confined to the St. 

 Lawrence system. 



Unio fabalis, Lea. 



New York. 



Chautauqua lake , Beauchamp. 



Pennsylvania. 



Allegheny river, Warren county Beecher. 



Ohio. 



Sciota river Beecher. 



Ohio river system , Sterki. 



Michigan. 



Rouge river, Wayne county Walker. 



Indiana. 



White river Hinkley. 



Iowa. 



Marsh. 



Tennessee. 



, Emmons. 



Duck river, Columbia Hinkley. 



^ Occurs in the St. Lawrence drainage system (in Wayne county, 

 Mich ) and in the Mississippi system. In New York the species 

 is apparently confined to the Mississippi sy steal. 



