u6 The Ottawa Naturalist. [September 



Pelecypoda. 



Anodonta Oregonensis, Lea. (1838). 

 Anodonta cognata, Gould, 1850. 



Small lake at Hope, aud Sumas Lake, W. Spreadborough ; 

 several living and adult shells from each of these localities. 



Sphoerium tumiditm, Baird. 



Sumas Lake, W. Spreadborough ; a fine series of living 

 specimens, in all stages of growth. This is the typical and only 

 known locility for this well defined species. 



* ' Sphcerium ( Musculium ) Raymondi ? J. G. Cooper, : 



Sumas Prairie, W. Spreadborough, several specimens, most 

 of which are very immature. Specimens similar to the larger 

 ones, in the Museum of the Geological Survey of Canada, were 

 collected at ponds between Quesnel and Stewart lakes, hy the late 

 Dr. A. R. C. Selwyn in 1875. 



* Pisidium proximum, Sterki. 



Second summit west of the Skagit River, in a small pond at 

 an altitude of 6,000 feet, W. Spreadborough ; many fine and 

 adult living specimens. 



* Pisidium Strcatori, Sterki. V r ar. 



Third summit west of the Skagit River, in a small pond at an 

 altitude of 6,000 feet, W. Spreadborough ; nineteen specimens. 



* Pisidium variabilc ? Prime. 



Sumas Prairie, W. Spreadborough ; six specimens. 



Pisidium, sp. undetermined. 



Peat bog near the Skagit River, J. M. Macoun ; eight 

 specimens. 



Pisidium, sp. undetermined. 



In a marsh, Lake House, Skagit River, J. M. Macoun ; 

 sixteen specimens. 



Gasteropoda. 



Ltmncea pahistn's, Muller. 



Similkameen River, J. M. Macoun ; five specimens. 



