148 Tllli CHICAGO ACADEMY OF SCIENCES. 



age of the Missouri River (Upper .Mississippi region; ; and also from 

 near Banff, Alberta indicating that it may occupy the Saskatchewan 

 drainage (Hudsonian region). Further investigation will doubtless re- 

 veal the fact that this species has migrated from one part of its range 

 to another via Two Ocean Pass in Yellowstone Park. The absence of 

 records from the intervening area is due to the confusion of this species 

 with catascopium, emarginata and palustris. A large collection cover- 

 ing the intermediate area is needed to throw further light on the range 

 of this species. 



RECORDS. 

 United States. 



Idaho: Birch Creek, Fremont Co. (Cooper; Hemphill); Sawtooth Lake, 

 Blaine Co. (Merriam). 



Montana: Hell Gate River, Missoula Co. (Binney; Tryonj ; Madison Co. 

 (Merrill). 



Washington: East of Colville, Stevens Co. (Boundary Survey); Lake 

 Oyosa, Okanogan River, Okanogan Co. (Cooper 1 ) ; Cascades of the Columbia 

 River, Skamania Co. (Cooper; Dunn); Spokane, Spokane Co. (Hemphill); 

 Fort Vancouver, Columbia River, Clarke Co. (Lea) ; Blue Lake, Grand Coulee 

 Mountains, Douglass Co. (R. E. Snodgrass). 



Wyoming: Madison River, Riverside, Yellowstone Park (Smith. Inst.). 

 British America. 



Alberta: Lake Louise, near Banff (Mrs. Schaeffer & Miss James). 



Ontario: North shore Lake Superior, Thunder Bay District (Ferriss) ; 

 Lake of the Woods, Rainy River District (Kennicott) ; Gull Rocks, Rainy Lake, 

 Rainy River District (Latchford). 



Geological Distribution : Unknown. 



Ecology: Not recorded. 



Remarks : Binneyi is related to both catascopium and emar- 

 ginata. It is generally wider than catascopium, is (usually) umbili- 

 cate, has a shorter, broader spire and more tumid whorls. The colu- 

 mella is quite different, being broader, erect and lacking the plait and 

 twist of that species. The spire is short and acute-conic, differing from 

 both catascopium and emarginata. It may be known from emarginata 

 by its more regularly ovate shell, less rotund body whorl, more acute 

 spire and more ovate aperture. It differs from canadensis in its shorter, 

 broader spire and widely open umbilical chink. Binneyi is related 

 to apicina Lea, differing in its more acute spire, narrower shell, open 

 umbilicus and more emarginate inner lip. Normally there is an entire 

 absence of a columellar plait in binneyi while in apicina a plait is 

 usually developed. When once recognized this species is very charac- 

 teristic and easily distinguishable from all related species. 



1 Probably intended for Osoyoos Lake. 



