INVERTEBRATES 
Cambarus diogenes Girard—Detroit and Lake Erie.* 
“s fodiens (Cottle). (Faxon). 
o affinis (Say)—Niagara.* 
propinquus Girard. (Faxon). 
virilis Hagen. (Faxon). 
immunis Hagen—Detroit.* 
ny rusticus Girard—Lake Erie.* 
The following shrimp, received through Dr. 
E. M. Walker, has been found in the Welland River 
and may occur here,— 
Palaemonetes exilipes Stimpson.* 
Schizopoda. 
The deep-water shrimp of the Great Lakes, which 
forms such a considerable part of the food of the 
whitefish, is also found in the lakes of Northern 
Europe. It has doubtless been derived independently 
on the two continents from the marine Mysis oculata. 
Mysis relicta Loven.—Stomach of ling, Port Credit 
(obtained by Mr. A. R. Cooper). 
Amphipoda. 
The small shrimps of this group often swarm 
along the quiet margins of the lakes, the streams and 
the ponds and also on the bottom down to consider- 
able depths. They serve as food for many of the 
fishes, 
-Pontoporeia hoyi Smith (by Nicholson as P. affinis). 
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