72 NEW YORK STATE MUSEUM 



Unio heterodon, Lea. 



Massachusetts. 



Anthony. 



Connecticut. 



Mixville Beecher. 



State coll. 



Vermont. 



Connecticut river, Hartland Walker. 



New York. 



Eastern part Anthony. 



Southeastern portion Beauchamp. 



Pennsylvania. 



Philadelphia , , Coll. Phila. Acad. 



Confined to the Eastern drainage system. 



Margaritana Hildrethiana, Lea. 



New York. 



Buffalo creek, Erie county Marsh. 



Buffalo Hinkley, Simpson. 



Ohio. 



Ohio river system Sterki. 



Michigan. 



Rouge river, Wayne county Walker. 



Indiana, 



Marsh. 



Illinois. 



Marsh. 



Iowa. 



Iowa City Hinkley. 



Missouri. 



Marsh. 



Tennessee. 



Walker. 



Arkansas. 



Marsh. 



Occurs in the St. Lawrence and Mississippi drainage system. 

 In New York it has been reported from the St. Lawrence system 

 only. 



