

5^lNo* a j/'v^ 



THE OTTAWA NATURALIST. ^Lf. V 



Vol. XX. OTTAWA, SEPTEMBER, 1906. No. 6 



NOTES ON SOME LAND AND FRESH WATER SHELLS 

 FROM BRITISH COLUMBIA. 



By J. F. Whiteaves. 



(A.) Prom the vicinity of the International Boundary, 

 on and between the Similkameen River and the 

 Sumas Lake and Prairie ; collected by J. M. 

 Macoun and W. Spreadborough in 1905. 



The specimens referred to in this list were collected by Mr. 

 Macoun in his capacity as Naturalist to the International Boundary 

 Commission, or by Mr. Spreadborough, who was his assistant. 



Although the region that they collected in is part of the 

 country traversed by Mr. J. K. Lord, when naturalist to a similar 

 commission in i860, no specimens of Limncea Sumassi, Baird, or 

 of Physa Lordi, Baird, were detected or recognized in any of their 

 collections. In the case of the Physa, the water at the typical 

 locality for it (Lake Osoyoos) was so high when Mr. Macoun and his 

 colleague visited it, in June, that no fresh water shells of any kind 

 were obtained there. And, in this connection it may be mentioned 

 that good specimens of the large Physa from Meach's Lake, near 

 CheNea, that were long thought to be either P. Lordi, or a large 

 form of P. ancillaria, have recently been examined by Dr. Dall 

 and pronounced to be the latter. "These shells," he writes, in a 

 letter dated May 11th, 1906, " according to Tryon and Haldeman^ 

 are typical Physa ancillaria, Say, except that they are larger than 

 usual. One of the middle sized specimens exactly agrees with 

 Tryon's figure." 



The species with an asterisk prefixed to their names were 

 kindly determined by Dr. V. Sterki. 



