Recent Canadian Unioniclm. 261 



in 1888, from the Assiniboine, and in 1889, from the Ked 

 Deer Kiver. It appears to be the only Unio in Lake 

 Manitoba, where it was collected by the writer in 1888, 

 and from the Fairford Eiver. In Alberta, Mr. Tyrrell 

 collected it, in 1885, in the Blind Man, Battle and 

 Medicine Kivers. 



Unio nasutus, Say. 



Two fine specimens of this species, from Toronto Bay, 

 were presented to the museum of the Survey, by Mr. 

 Latchford, in 18$6, and since then numerous specimens of 

 it were obtained by Professor Macoun (in 1894) at Ron- 

 deau, on Lake Erie. 



Unio Novi-Eboraci, Lea. (Perhaps = U. iris, Lea.) 



Grand River, at Cayuga, Professor Macoun, 1890 ; one 

 perfect specimen. Thames River, at Chatham (two speci- 

 mens) and Detroit River, below Sandwich (one specimen), 

 Professor Macoun, 1894 



Unio phaseolus, Hildreth. (? = U. fasciolaris, Rafinesque.) 



Detroit River, at Windsor (one specimen) and Lake 

 Erie, at Port Colborne (two specimens), Professor Macoun, 

 1885. Lake Erie, at Kingsville, Ontario (one specimen), 

 J. T. McQueen, 1890, and Thames River, at Chatham (one 

 specimen), Professor Macoun, 1894. 



Unio pressus, Lea. 



Boulder River, one of the upper branches of the Atta- 

 wapishkat River, west of James Bay (in lat. 52° 30' and 

 long. 87° 30'), Dr. R. Bell, 1886 ; a perfect and fresh right 

 valve. West branch of the Grand River, at Ayr, Ontario, 

 Professor Macoun, 1894,a slightly distorted but living shell. 

 This species has long been known to be common in the 

 Rideau Canal and river, near Ottawa, where it was first 

 noticed by the late E. Billings, about the year 1856 or 1857. 



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