162 College of Forestry 
The stomach contents of number 5 were almost entirely 
of the cladoceran species Leptodora hyalina, the individuals 
being very large. Leptodora is a surface species and it is 
exceedingly interesting to find a whitefish, typically a bot- 
tom-feeding group, using this crustacean as food. Leptodora 
is also considered a typically warm weather form and its 
presence in such large numbers in a fish caught in November 
is noteworthy. Kofoid (1908, p. 253) records Leptodora as 
occurring usually in small numbers in the Illinois River from 
June 28 to August 30. In Lake Meredosia, Illinois, it was 
very abundant in the upper three feet of water at midday 
in May-June. It was apparently more common in the back- 
waters than in the channel. Marsh (1903, p. 36) states 
that Leptodora is absent from Lakes Winnebago and Green, 
Wisconsin, from November to May, its principal occurrence 
being in the months of July, August and September. (See 
also page 86 for dates and quantity per square meter.) 
Birge (1897, p. 350) gives the season as from June 1 to 
November 30 (see also pp. 353 and 404) in Lake Mendota, 
Wis. No statement has been seen regarding the food of the 
Tullibee, but as other members of the group feed largely upon 
mollusks there is no reason to doubt that the Tullibee appro- 
priates this class of animals as a part of its food, if it is, 
like the Common Whitefish, a bottom feeder. Additional 
study is needed on this point. 
Both Jordan and Evermann (1911, p. 32) and Bean 
(1914, p. 342) refer the Whitefish of Oneida Lake to this 
species, which is known locally as the “ Oneida Lake White- 
fish.” The Common Whitefish is not known to inhabit this 
body of water. 
* Coregonus quadrilateralis Richardson. Round Whitefish ; 
Frostfish. 
Bean (1903, p. 221) records the food of this fish to con- 
sist of small shells and crustaceans. Its food is doubtless 
similar to that of the Common Whitefish. 
