Pontoporeia Hoyi Smith, has, I think, been reported only from 

 Lake Superior and Lake Michigan, and the only American locality for 

 My sis relicta, Loven, has been these same lakes. In fact, a compari- 

 son of this list with those published by Smith and Forbes of the 

 fauna of the Great Lakes shows that the fauna of the deep water of 

 Green Lake is almost identical with that of Lake Michigan. 



Ripon, Wis., U. S. A., May 18, 1391. 



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