GEOGRAPHICAL DISTRIBUTION OF NEW YORK UNIONIDJE 



Indiana. 



White river, Indianapolis Walker. 



Illinois. 



Winnebago county Hinkley. 



Occurs in the Eastern, St. Lawrence and Mississippi drainage 

 systems. Found in all three systems in New York. 



" Two specimens (of Unio pressus, Lea) were taken from a 

 small lake near Herkimer, New York. The lake lies between 

 high hills and receives as its water supply an artificial branch of 

 West Canada creek, a mountain stream having no connection 

 with the Erie canal, or any stream that could possibly reach it 

 from the west or south. It empties into the Mohawk, but over 

 a very rocky bed, and after a considerable fall. The species is 

 essentially western, but is recorded at Troy, N. Y. (Yide Lewis, 

 in Bulletin Buff. Soc. Nat. Sci., Aug, 1874, p. 127.) Its occur- 

 rence in the latter locality may be explained, perhaps, in a man- 

 ner similar to the preceding (i. e., that it migrated from the west 

 through the Erie canal), though at no known intermediate 

 localities has it been found." (R. E. Call, Amer. Nat., p. 473 

 1878.) Prof. Call is probably mistaken in supposing that this- 

 species reached Troy by way of the Erie canal. Some of Dr. 

 Lea's type specimens of Lymphynota compressa, the name under 

 which the species was originally described, were obtained from 

 Normanskill, a small stream entering the Hudson just south of 

 Albany. Dr. Lea's description of the species was published iiL 

 1829, only four years after the opening of the Erie canal. 



Unio radiatus, Lamarck. 



Maine. 



Winkley. 



Rhode Island. 



Carpenter. 



Connecticut. 



Connecticut river Gebhard. 



New York. 



Lake Champlain Walker. 



Hudson river system 



Saratoga lake Simpson. 



Delaware river system 



