GEOGRAPHICAL DISTRIBUTION OF NEW YORK UNIONID.E 79 



one day. If he has not made a mistake in identifying the speci- 

 mens, it would seem that the species is becoming more abundant 

 in the Eastern drainage system than it formerly was. 



Margaritana margaritifera, Linn. 



Newfoundland. 

 State coll. 



Maine . 



Emmons coll. 



Massachusetts . 

 Haydenville Hinkley . 



Rhode Island. 



Carpenter. 



Vermont . 



Connecticut river, Hartland Beecher. 



Winooski river Walker. 



New York. 



Lake Champlain State coll. 



Tributaries of Mohawk, Oneida county Beauchamp . 



Pennsylvania. 



Chester county , Hartman . 



Illinois. 



Joliet Hinkley. 



Upper Missouri river Simpson.. 



Oregon. 



Columbia river Smithsonian coll. 



Calif ornia 



Walker . 



France. 



State coll. 



Germany. 



State coll. 



Occurs in the Eastern, St. Lawrence and Mississippi drainage 

 systems. In New York it has been reported only from the Eastern 

 and St. Lawrence systems. This species has a wide distribution, 

 being found in the northern portions of Europe, Asia and North 

 America. 



