The Relation of Mollusks to Fish in Oneida Lake 281 
It was observed feeding upon Cead leaves of Water Celery 
(Vallisneria spiralis), and is eaten by the Common Sucker 
and the Manitou Darter. 
55. Planorbis exracuous Say. Fig. 45, Nos. 7-9. 
Observed at only one station, 3 and two habitats, 
1, C, and 2, both with thick vegetation; in the latter place 
feeding on dead Typha leaves, floa‘i ing on the surface of the 
water. At Isle Royale it was found on the muddy bottom 
of a small stream, at a depth of two to five feet (p. 293) ; 
in the Saginaw Bay region (p. 165) it was found on drift. 
wood, lily pads, and on dead leaves; in the Georgian Bay 
region (p. 101) it was found in protected weedy places, and 
was noted to be light colored in sandy places and brown in 
muddy places. Mwacuous is eaten by the Pumpkinseed. 
Under the generic name of Planorbis upwards of thirteen 
fish are no'ed as using this genus as food. These are Dog- 
fish, Small-mouth Buffalo, Common Red Horse, Channel-eat, 
Brook Trout, Mud Minnow, Fresh-water Killy, Killifish, 
Viviparous Minnow, Bluegill, Heros Sunfish, Pumpkinseed, 
and Sheepshead. 
Faminy LyMN#«IDzZ. 
Genus Lywnxvaa Lamarck. 
56. Lymnea stagnalis lilane F. C. Baker. Fig. 46, 
Nos. 9-12. 
This large pond snail was observed at thirteen stations, 
at four of which it was abundant, at four common, and rare 
or uncommon at the rest.- It lives in a variety of habitats, 
the most characteristic and perhaps the normal one being 
near the shore, where there are many boulders, in from six 
to eight inches of water, where it feeds on the green fila- 
mentous algze covering the rocks. It seems to be rare on 
shores where the force of the waves is not diminished by off 
shore vegetation, Water Willow, or bulrush. 
