The Relation of Mollusks to Fish in Oneida Lake — 175 
Seven young specimens, 2 to 31% inches long, had fed 
chiefly upon Entomostraca (50 per cent.) among which were 
Daphnia, Acroperus, Cyclops, Cupris: Simocephalus amert- 
canus, and Macrothrix laticornis; 25 per cent. of the food 
was molluscan (Physa); 20 per cent. was insect larvae 
(ephemerids and Chironomus). A small amount of Wolffia 
and other aquatic vegetation was present. 
Three adult specimens of this species were examined from 
a lot purchased in the Syracuse market, and said to have 
been caught in Oneida Lake. The contents of the stomachs 
did not give decisive results owing to their advanced state of 
digestion. The data is as follows: 
No. 1. 310 mill. long. Stomach and intestine were almost empty. 
Insecta. 1 Chironomid (7) larval head. 
Insect larve, legs. 
No. 2. 330 mill. long. Stomach empty. 
No. 3. 300 mill. long. 
Insecta. 2 Heragenia larve, 12 and 15 mill. long in stomach. 
Insecta. Hexagenia larve, fragments....... 
Mollusca. 1 Ancylus parallelus............. . 
Plants: Vilamentous algz 00.5... 5. 20.0... 
Mud. AC Detiitnant Gis cia hae 2d Boe 
In intestine 
The Mollusca form about 1 per cent., and is notable for 
the presence of the fresh water limpet Ancylus parallelus. 
Ameturus  nebulosus (LeSueur). Common Bullhead ; 
Speckled Bullhead. 
From studies by Forbes (1888, b. pp. 460-461, 36 speci- 
mens) the food of the Common Bullhead (which included 
also the Black Bullhead (Ameturus melas ae has been 
ascertained to consist of: 
TELE Tic td a Mae elias Bien are Isami ee leat Aime nga pega 20 per cent. 
SHSM ES =. AS. cys, <, autor hehe aves, . rotegenns: Ld ta. 2 20 per cent. 
Insects. (Dipterous larve, Hexagenia, Odonata, 
POTTS bY Pal iM SECU cect 5 uth wen a chess a cere 25 per cent. 
Crustaceans. (Allorchestes dentata, Diaptomus, 
CRAB toon (3's, naar afore onan ins «) svete cone ba dy os eaee 13 per cent. 
Miscellaneous, including vegetation ............ 22 per cent. 
