146 College of Forestry 
“The stomach contents of the mussels found in the reser- 
voir of the feeder canal, a shallow, pond-like body of water, 
bore considerable contrast to that of the river. * * * It 
was “puddle plankton” rather than that which is char- 
acteristic of either lakes or rivers. * * * ‘The main mass 
consisted of small globular and thick celled green or brown- 
ish flagellates, probably Trachelemonas lagenella. Among 
other organisms were species of Phacus, several species of 
Scenedesmus, Pediastrum pertusum, Gomphonema, several 
species of Navicula, a little Botryococcus braun, Anu 
cochlearts, Cosmarium, small fragments of a Conferva-like 
alga two or three cells long, fragments of the test of Ceratium 
hirundinella, and the brown objects resembling fungus 
spores. ‘There were numerous narrow curved objects which 
were probably loricas of T’rachelemonas.” 
Allen (1914, p. 129) studied the food and feeding habits 
of eight species of mussels from Winona Lake, Indiana. 
Those species marked with an * occur in Oneida Lake. 
*Lampsilis luteolus Lam. Lampsilis rectus Lam. 
Lampsilis subrostratus Say. Quadrula rubiginosa Lea. 
Lampsilis alatus Say. Unio gibbosus Barnes. 
*Lampsilis ligamentinus Lam. *Anodonta grandis Say. 
“Being by far the most numerous in Winona Lake, 
L. luteolus was used for the greater part of the work.” 
( Allen.) 
After considering the methods of digestion and feeding, 
including the action of cilia and the function of mucus for 
ingestion, Allen lists (p. 188) the species of plants (by 
genera) and other material found in the stomach and intes- 
tine. No reference is made to Petersen’s “ dust-fine detritus ” 
but in the statement “ but the mussel does not refuse minute 
dead animals or small fragments of sloughed and decaying 
animal tissue,” this material may be included, as also part of 
the list of miscellaneous contents listed on page 139. The 
full list of plants (which is qualitative only) and. other 
material in the alimentary tract is given below: 
