Recent Canadian Unionidm. 259 



two specimens. Thames Eiver, at Chatham (several spe- 

 cimens) and Detroit Eiver, below Sandwich, Ontario (one 

 specimen),Professor Macoun, 1894. 



Unio coccineus, Lea. 



Grand Kiver, Cayuga, Ontario, Professor Macoun ; one 

 " fairly typical specimen," (C. T. Simpson). 



Unio complanatus (Solander ?) Lea. ( U. purpitreus, Say.) 

 Abundant in Nova Scotia, New Brunswick, Quebec 

 and Eastern Ontario. Collected by Dr. K. Bell, in 1859, in 

 creeks, rivers and bays on the north shore at the east end of 

 Lake Superior, along the entire north shore of Lake Huron, 

 also in the St. Mary Kiver. Lake Mpissing, Dr. A. B. C. 

 Selwyn, 1884 (whence it had previously been recorded by 

 Dr. Bell, in 1859). Montreal Eiver, Lake Temiscaming, 

 Ontario, Dr. R Bell, 1887. 



Unio cornutus, Barnes. (?= U. reflexus, Bafinesque.) 



Grand Eiver, Cayuga, Ontario, Professor Macoun, 1890 ; 

 a perfect and fresh left valve. 



Unio elegans, Lea. (U. truncatus, as of Bafinesque.) 



Thames Eiver, at Chatham (Ontario), Professor Macoun, 

 1894 ; one dead but perfect specimen. 



Unio ellipsis, Lea. (?= U. olivarius, Bafinesque.) 



Ottawa Eiver, opposite L'Orignal, E. Bell, 1854, and 

 near Ottawa, G. C. Heron, 1879 (as U. olivarius, Bafin- 

 esque). St. Lawrence Eiver, at Montreal, E. Bell, 1858, 

 and near Quebec, J. F. Whiteaves, 1861. Missisaugi 

 Eiver, on the north shore of Lake Huron, Dr. E. Bell, 

 1860. Lake Erie, at Port Colborne, and Detroit Eiver, 

 near Windsor, Professor Macoun, 1885. 



Unio gibbosus, Barnes. (?= U. dilatatusj&a&nesqvie.) 

 This species, which has long been known to be abundant 



