256 Canadian Record of Science. 



1885, at Port Dover, Lake Erie, and in 1890, at Port Col- 

 borne, on the same lake. 



\\\ Manitoba it was collected by Dr. R Bell in 1878, at 

 the outlet of Lake Winnipeg and from Lake Winnipeg 

 between Fort Alexander and Elk Island. It occurs, asso- 

 ciated with A. Marryattana, Lea, in the Fairford River, 

 and is the only species of Anodonta that the writer was 

 able to find in Lake Manitoba (in 1888). 



In the district of Saskatchewan one perfect specimen 

 was collected by Dr. E. Bell, in 1882, at Buffalo Lake, 

 near Methy Portage. 



Mr. Simpson, to whom the writer is indebted for the 

 identification of specimens from most of these localities, is 

 convinced that A. Dallasiana and A. Kennicotti, of Lea, 

 are both synonyms of A. Simpsoniana. 



Anodonta subcylindracea, Lea. 



Widely distributed in the provinces of Quebec and 

 Ontario, from Lakes Metapedia and St. John to the east- 

 ward, to creeks, rivers and bays at the east end of Lake 

 Superior and north side of Lake Erie to the westward. 

 Mr. Simpson, however, regards A. subcylindracea as a mere 

 synonym of A. Ferussaciana, Lea. 



MABGAE1TANA, Schumacher, 1819. 



Margaritana calceola, Lea. (M. dcltoidea, Lea.) 



Lake Erie, at Fort Dover, Professor Macoun, 1890. 

 Grand River, at Belwood, Ontario, J. Townsend, 1892. 

 East and west branches of the Grand Eiver at Gait and 

 Ayr, Professor Maconn, 1894. 



Margaritana complanata, Barnes. 



Manitoba. Upper Assiniboine Eiver, Dr. E. Bell, 1874 ; 

 Souris Eiver, Dr. A. E. C. Selwyn, 1882 and 1884; Shoal 

 Eiver and near Elk Island, Lake Winnipeg, Dr. E. Bell, 



