FOOD AND PARASITES OF SOME FRESH-WATER FISHES. 517 
far into the intestine. In different kinds of fishes, Azza included, it 
~ was noticed that the cestodes apparently moved forward in the ali- 
mentary tract after the death of the host, often protruding into the 
mouth. Forbes (c, @) examined young specimens of Ama and found 
their food to consist of may-fly larvee, cstracods, and algw, none of 
which we found in the mature specimens; in older fish he found fish, 
mollusks, and crustacea. 
3. Ameiurus nebulosus, common bullhead. 
The 5 specimens examined were caught in Lakes Mendota and 
Monona during the months of April, July, and August. ‘The food 
contained in the different parts of the alimentary tract was in such a 
condition as to make impossible a determination of its separate parts. 
In one fish a minnow could be recognized and in another the remains 
of a crawfish. 
The most abundant parasites were cestodes, found in the intestine 
of 5 fish, 3 of these also containing them in the body cavity. Acan- 
thocephala were found in large numbers in the intestine of 4 fish, 
liver cysts in 4. Trematodes and nematodes were found in the intes- 
tine of but a single fish. The cestodes found were 2 species of Coral- 
lobothrium and a species of Proteocephalus (?). 
4, Hrimyzon sucetta, chub sucker. 
¥y ) 
A single specimen ecaueht in April was without food and had as 
> °o 
parasites only a few Acanthocephala in the intestine. 
5. Hsox luctus, common pike. 
The 35 specimens examined were all taken from Lake Mendota 
during April, May, or November. Thirteen of the entire number 
were without food, the remaining 22 showing either a small or a large 
quantity of food within the alimentary tract. The different kinds of 
food, and the number of fish in which each kind was found, can readily 
be seen from the following table: 
Fish in Fish in 
Food. | which | Food. which 
| found. | found. 
MIM OW. Siceeenatoncine oes eee ce eaeene 17 | Grawifishtes concen: scene ae eee 1 
Mepomisimelsons-o-- seco. wee mseee econ Tl, eeCChes: 20o8 22. a 2s ose osceeeeennce nee 1 
eral SOR: Soca cwccinc cece ee age nee sociem= 1 
Forbes (c, d) found the food of the pike to be almost exclusively 
other fish, this being true of 36 of the 37 specimens he examined. It 
will be seen at once that our results are almost identical, but 2 of the 
35 pike examined by us containing any food other than fish. We also 
found that as a rule but one or two fish were present in the alimentary 
tract; 2 of the pike we examined were exceptional, in that one con- 
tained 10 and the other 20 minnows. 
