TJie Prndiiclk'Uy of Fish Food in Oneida Lake 191 



of these. Seven species of this group were collected in 191 5 

 that were not found in the 1916 material. Identifications by 

 Chancer Juday. 



order copepoda 



Family Cyclopid.e 



Cyclops albidus J urine. 



This small crustacean was found on three varieties of bottom 

 in y/'S ^^^t of water. The finding of but one species of 

 copepod in the bottom collections is interesting. Dr. Marsh 

 reports this species as being a common inhabitant of the bottom 

 areas of lakes and other bodies of water. In the 1915 studies 

 (mostly from the stomach contents of fish) seven species 

 belonging to three families were noted (Baker '16, p. 300). 

 Identified by Dr. C. Dwight Marsh. 



The Clad oc era and Copepoda here listed seem to belong to 

 the littoral fauna. All but Sida crystallina and Simocephalus 

 serriilatus (which descend to a depth of 9 feet) are confined 

 to depths of six feet or less. All of the Entomostraca were 

 abundant in filamentous alg^e (Cladophora, CEdogoniimi, Spiro- 

 gyra) associated with amphipods, oligochsete worms, isopods, 

 chironomid larvae, and gastropod mollusks. A era perns harpcE 

 and Eurycercus laiiiellatus were notably abundant. These 

 small animals are of very great value as food for the young 

 of large fish and of small fish, many of which were observed 

 browsing on the algae which contained these minute forms of 

 life. 



order ostracoda. 



Family Cypridid.e 



Cypria exsculpta S. Fischer. Cypridopsis vidua (O. F. 



(Miiller). 



These two species are common in ponds, streams, and lakes. 

 Cypridopsis vidua is interesting because of its scavenger habits 

 (Sharpe, '96, p. 470). Identifications by R. W. Sharpe. 



These small crustaceans, which greatly resemble in external 

 form some of the nunute mollusks belonging to the family 



