Recent Canadian Uhionidat. 365 



it, apart from the ordinary mishaps in trade ? — sometimes 

 too much snow, other times too little. On other occasions 

 the ice or the floods carry away his booms and scatter the 

 logs, to be often stolen by land pirates, who will secrete his 

 property, and annoy him in trying to find it. 



As to the utility of the forest, though it may not attract 

 the rain or influence its downfall, there can be no doubt 

 as to its regulating the flowing of the waters by holding 

 them back in the glades and swamps, sheltering the land 

 from the fierce rays of the sun, preventing rapid evapora- 

 tion to a great extent, and thus preventing oftentimes 

 damaging floods and dried up streams. For the reasons 

 advanced, does it not behoove us to use our influence to 

 bring about such legislation as will have the effect of 

 preserving and protecting our forests, on which so much 

 depends ? 



Additional notes on Recent Canadian 

 Unionid^e. 



By J. F. Whiteaves. 



Unio Canadensis, Lea. 



In a letter to the writer, dated June 18th, 1895, Mr. 

 Simpson says, " I think there can be little doubt, from 

 examining the type of TJ. Canadensis, that it is a some- 

 what injured specimen of the male of U. ventrtcosm, 

 Barnes. 



Mr. Bryant Walker, of Detroit, informs the writer that 

 he has, in his cabinet, specimens of each of the following 

 species, from the Detroit Iiiver : 



M.\k<;.\lMTA\A BlLDRETHIANA, Lea. 



Main channel of the Detroit River off Belle Isle, 

 collected by the Michigan Fish Commission in L895. 



