The Relation of Mollusks to Fish in Oneida Lake 145 
Actual records of the stomach contents of fresh water 
mussels are rare. Two of the best of these papers are by 
Wilson and Clark (1912). The information on mussel 
food contained in one of these papers, which describes 
the mussels of the Kankakee River in Indiana and Tllinois, 
is given below (op. cit., pp. 10, 12). The mussels were 
collected in the Lake of the Woods, and Pretty Lake, near 
Plymouth, both localities being in Indiana. 
Algae. 
Chlorophyceze 
Cosmariwm in Anodonta grandis, Lampsilis luteola. 
Pediastrum in Anodonta grandis. 
Cyanophycewe 
Clathocystis in Anodonta grandis, Lampsilis luteola. 
Calospharium in Anodonta grandis. 
Rotifera. 
Anurwa in Lampsilis luteola. 
Nematoda. 
Ascaris in Anodonta grandis. 
Clark and Wilson (1912, pp. 60, 61) also summarize the 
food habits of the mussels of the Maumee River as follows: 
“ The stomach contents of mussels taken from the main cur- 
rent of the St. Mary’s, St. Joseph, and Maumee rivers were 
rather noteworthy for their paucity of organic material. 
Through the large mass of muddy matrix filling the stomach* 
were usually scattered a few Scenedesmus, various diatoms, 
and an occasional Pediastrum or Cosmarium. At the riffles 
small brown ecystlike objects, which may have been a species 
of Trachelemonas, were quite common; with the exception of 
this the mussel contained very little. Among the organisms 
noted were Scenedesmus caudatus, Celastrum microsporum, 
Pleurosigma, several forms of Navicula, Phacus longicaudus, 
Pediastrum baryanum, Gomphonema, a sponge spicule, and 
an active Huglena-like organism. 
*This is probably the kind of material described by Petersen as “ dust- 
fine ditritus.”—F. C. B. 
