Recent Canadian Unionidce. 257 



1883 ; Swan River, J. B. Tyrrell, 1887, and Assiniboine 

 River, J. B. Tyrrell, 1884 



Keewatin. Nelson River, Dr. R. Bell, 1878. 



Saskatchewan. Shell River (township 50, range 2 and 

 3, west of third Initial Meridian) north of the north Sas- 

 katchewan, 0. J. Klotz, 1890. 



Alberta. Battle River, three miles above Grattan Lake, 

 J. B. Tyrrell, 1885. 



Margaritana margaritifera, L. 



From the Province of Quebec this species has already 

 been recorded as having been collected by Dr. R. Bell (in 

 1857) in the Green and Rimouski rivers, at Lake St. John 

 and both the Metapedia Lakes, and by the writer, (in 

 1861) in the River St. Charles, near Quebec City. More 

 recently it has been collected in that province by Dr. 

 EL M. Ami, in 1883, in the Assumption River, near Raw- 

 don ; by N. J. Giroux, in 1892, at the Lac de la Ferme, 

 Riviere du Loup, en haut, and in that river; also by 

 A. P. Low, in 1894, in the Romaine River. 



In British Columbia, small and thin but characteristic 

 specimens were found by Dr. G. M. Dawson, in 1885, in 

 small streams entering. Malaspina Strait, on the mainland 

 side ; also, in 1890, in Kakwous Lake, the source of the 

 Bonaparte River, at an altitude of about 4,000 feet. 



Margaritana marginata, Say. 



The small and typical eastern form of this shell is 

 common in the province of Quebec and in eastern Ontario. 

 A few specimens of the large western variety known to 

 students of the Unionidre as M. truncata, Say (M. S.) 

 were collected by Professor Macoun, in 1894, at Gait and 

 Ayr, from the east and west branches of the Grand River 



Margaritana rugosa, Barnes. ( ? = M. costata, Rafin- 

 esque, sp.) 

 This species is widely distributed in the provinces of 



