GEOGRAPHICAL DISTRIBUTION OF NEW YORK UNIONIM 53 



The St. Lawrence system, including the Great Lakes, the lakes 

 of the central part of the State, the St Lawrence river and Lake 

 Champlain. 



The Mississippi system in the southwestern corner of the 

 State, including Chautauqua lake, Allegheny river and its 

 tributaries. 



Much careful collecting has been done at various points along 

 the boundaries of the three drainage systems represented in New 

 York. Thus Dr. James Lewis and Prof. R. Ellsworth Call 

 have made us thoroughly acquainted with the molluscan fauna 

 of the neighborhood of Mohawk, N. Y., just within the border 

 of the eastern drainage system. A few miles further west, Rev. 

 W. M. Beauchamp has done much collecting in the counties of 

 Onondaga and Oneida, just within the border of the St. Lawrence 

 drainage system. It is worthy of note that some species found 

 to be plentiful in Onondaga and Oneida are reported as very 

 rare at Mohawk and are not found at all as far east as the 

 Hudson river, for example, U. luteolus, U. rubiginosus. Dr. S. 

 Hart Wright has collected in Yates county in the St. Lawrence 

 system, nearly on the border, between this system and the Mis- 

 sissippi system. Shelley Crump and Rev. John Walton have 

 collected in Monroe county, N. Y. For several years Dr. Charles 

 E. Beecher collected from the Allegheny river and other streams 

 at Warren, Warren county, Pennsylvania, almost the north- 

 eastern limit of the Mississippi drainage system. His collection 

 was presented to the New York State Museum in 188G and 1887, 

 and has been largely used in the preparation of this paper. 

 J. Allen collected in Chautauqua county, N. Y., and its neighbor- 

 hood, on the dividing line between the Mississippi and St. Law- 

 rence drainage systems. Dr. Y. Sterki has done good work in 

 Ohio, particularly in the Ohio river system. Bryant Walker has 

 made a special study of the Unionidae of Michigan, an area lying 

 almost entirely in the St. Lawrence drainage system, but over- 

 lapping the Mississippi system. A. A. Hinkley has collected in 

 Illinois, a region lying partly in the St. Lawrence and partly in 

 the Mississippi drainage systems. 



F. R. Latchford and Geo. M. Leslie have worked in Ontario, 

 wholly within the St. Lawrence system. 



Carpenter in Rhode Island, Gould in Massachusetts, Winkley 

 and Morse in Maine, and others have made us acquainted with 

 the mollusca of New England. 



