6; 



Dr. Sweeny had seen catfish jerk snails out of their shells 

 by getting hold of the animal and drawing it out bodily. He 

 had also noticed thousands of shells of the fresh-water mussel, 

 or Unio, popularly known as the "hydraulic clam," with a hole 

 through on each side as large as a half-dollar, and the meat 

 gone. Doubtless this was the work of some of the fishes that 

 Prof. Forbes has examined. 



Mr. Mather had fed the salt-water mussel, Mytilis, to the 

 marine sheepshead, Diplodus or ArcJiosargus, as the scientists 

 have it, while he was connected with the New York Aquarium, 

 and had observed that this fish used its sheep-like incisors to 

 nip off the byssus which held the mussel to its anchorage, and 

 then crushed it with its pavement of teeth back of the jaws. 

 After extracting the meat the shells were expelled from the 

 mouth, and he had never noticed fragments of shell in the 

 exuvee. He had fed the fish hard clams also, but these required 

 cracking with a hammer, and the shells were ejected after the 

 meat was devoured as in the case of the mussels. 



Dr. Parker asked what the food of the lake whitefish 

 consists of. 



Prof. Forbes answered that he had made no study of the 

 food of this fish, except in the fry, and he had fully reported on 

 their food. The United States Fish Commission has shown 

 that crustacaea form the principal diet of the adult fish. 



Mr. Clark had examined some of the whitefish taken 

 February, and found nothing but small crustaceans in their 

 stomachs. 



SOME EXPERIMENTS WITH THE FRY OF 

 WHITEFISH. 



BY DR. J. C. PARKER. 



The question as to whether the young of the whitefish 

 would find food and live when planted out of season much 

 earlier than at the time at which they usually mature had been 

 one of much discussion amongst those interested in fish-culture 



