1883. ] Zvilogy. 205 
lake in Herkimer Co., N. Y., which empties over a rocky bed, 
with numerous falls into Mohawk river (May, 1877), by R. E. 
Call (vide Am. Nat. for July, 1878, p. 473). DeKay in his Mol- 
lusca of New York (p. 191), mentions receiving it from Sandy 
creek in Jefferson county, and from Oak-orchard creek in Orleans 
county. Professor C. B. Adams in his Fresh water and land Shells of 
Vermont (vide Thonipson’s History of Vermont, 1842, p. 166), 
says: “The species * * * has its eastern limit in the streams 
west of the Green mountains.” He also describes under the name 
plebius Adams, a variety found in a small brook near Middlebury 
in that State. Mr. F. R. Latchford of Ottawa, Canada, informs 
me that the species has been found quite recently in the Rideau 
river by Mr. Tyrrell, of the Canadian Geological Survey; this is I 
think the most northerly point from which it has been obtained. 
I have just received it from Winooski river, at Winooski, Ver- 
mont, where it was found by Mr. Geo. H. Hudson. As Winooski 
is situated near the outlet of Winooski river, where it falls into 
county lake in which Mr. Call found it, by the agency of water fowls, 
from some of the sources here mentioned, two of which lie within 
, bythe late Dr. Jas. Lewis, the species has become very abundant, it 
_ 8 More frequent in the bends of the river, where the water 
| MOVES: ves slowly —A. F. Gray. 
