GEOGRAPHICAL DISTRIBUTION OF NEW YORK UNIONID^E 91 



Margaritana rugosa, Barnes. 



New York. 



Hudson river system 



Onondaga lake Beecher. 



Onondaga county Beauchamp. 



Canandaigua lake Wright. 



Pittsford, Monroe county Crump. 



Genesee river , Dewey. 



Genesee canal, Olean Beecher. 



Pennsylvania. 



Allegheny river, Warren county Beecher. 



Ontario. 



Ottawa Latchford. 



Ohio. 



Ohio river, Cincinnati Beecher. 



Ohio river system Sterki. 



Michigan. 



Detroit river Walker. 



Grand river, Kent county Walker. 



Indiana. 



White river Walker. 



Illinois. 



Rock river, Rockford Beecher. 



Winnebago county, etc Hinkley. 



Iowa. 



Iowa river, Marshalltown Quintard. 



Wisconsin. 



Marsh. 



Kansas. 



Cottonwood river, Emporia Quintard. 



Missouri. 



Marsh. 



Tennessee. 



Marsh. 



Duck river Hinkley. 



Arkansas. 



Clinton Hinkley. 



Louisiana. 



Mt. Lebanon Hinkley. 



Occurs in the Eastern, St. Lawrence and Mississippi drainage 

 systems. Found in all three systems in New York. 



