lite Prnducrri'Ux of Fisli Food in Oiiclda I.akc 193 



lence of filamentous alj^:c. llie species previously recorded as 

 Asellus aqualicus Linn, should be chanj^ed to .Isellits coui- 

 mtmis which appears to be the only isopod in the lake (Baker, 

 '16, p. 302 and elsewhere). 



The Malacostraca group of Crustacea is of great importance, 

 forming a large part of the food of many fish, both bottom- 

 feeding and plankton- feeding forms. Their great abundance 

 and the facility with which they move from place to place 

 render them of first value in fish culture. Such forms as 

 HyalcUa, Gainniarus, and Asellus may easily be transported 

 from one pond to another together with their food which is 

 chiefly filamentous algse. 



Mancasellus tenax (Smith). 



Two specimens of this species were found in Nicholson's 

 Bay near Brewerton (Field No. iiSob). The habitat was a 

 protected, pond-like body of water, separated from the open 

 lake by a subaqueous beach-barrier covered with Water Wil- 

 low (Dianthera anicricana) and Smith's Bulrish (Scirpus 

 smithii). These are the first specimens found in the lake, all 

 previous isopods having been identified as Asellus commniiis. 

 As mentioned by Huntsman ('15, p. 148) this species is much 

 less abundant than Asellus and is usually found in more open 

 water. 



This isopod is reported by Richardson ('05, p. 415) as occur- 

 ring in Lake Superior, Lidiana, Michigan, and Lake Huron. 

 Huntsman ('15, p. 148) gives its range eastward to Lake 

 Ontario (Toronto Island) and the present record extends its 

 eastward range to Oneida Lake. 



ordf.r decapoda 

 Family Astacid.t; 

 Cambarus propinquus Girard. Cambarus immunis Hagen. 

 With one exception, all of the crawfishes from Lower South 

 Bay and vicinity were of one species, Cambarus propinquus. 

 Cambarus immunis (No. 803) occurred sparingly on a sand 

 liottom in y/2 feet of water. These belonged to the so-called 



7 



