The Relation of Mollusks to Fish wv Oneida Lake, 197 
Boleosoma in an aquarium as follows: “ Crouching catlike 
before a snail-shell, he will snap off the horns which the 
unlucky owner pushes timidly out. But he is often less 
dainty, and seizing the animal by the head, he dashes the 
shell against the glass or a stone until he pulls the body out 
or breaks the shell.” The Oneida Lake specimens are, 
apparently, the first to definitely show a mollusk eating 
tendency of this darter. Much additional data is needed 
before our knowledge of the food of this species is adequate 
for generalization. 
* Roccus chrysops (Rafinesque). White Bass. 
Forbes (1880, a, p. 37) examined 11 specimens, 8 of 
which gave the food ratios shown below: 
Mnsectae (May-fiesi)s. <4. Ssps ate wits Pee ate te eh 69 per cent. 
Crecinces:, | Copepods))i)5.'.:./:5) 4 se.dieele sie elaara ss 8 per cent. 
Biscese (Simmishisiebes)ic acines.. vos Semis te re cies eae 20 per cent. 
Miscellaneous: ai. fils aceicude ©, 4 steieseun she cioe ae ee ae = 3 per cent. 
Bean (1905, p. 523) records minnows, crawfish and other 
fresh-water crustaceans, and also minute mollusks. 
A plodinotus grunniens (Rafinesque). White Perch; Sheeps- 
head ; Fresh Water Drum. 
The Sheepshead feeds largely on mollusks, its pavement- 
like teeth being especially adapted for crushing the shells 
of clams and large snails. This class of nindnials furnish 
the entire food of the adult. Five genera of mollusks have 
been noted (Forbes, 1888, b, pp. 512-513). 
Campeloma decisum, taken in October. 
Planorbis, taken in June. 
Spherium, taken in June and October. 
Unio, taken in June. 
Anodonta, taken in June. 
The food varies greatly with the age of the individual. 
Forbes (1880, a, pp. 64-65) examined 29 specimens of all 
ages and from his data the following tables are constructed: 
