286 College of Forestry 
62. Galba palustris (Miiller). Fig. 45, No. 43. 
This common pond-snail was observed at but one station, a 
Typha habitat, and was here rare. It doubtless oceurs 
abundantly in swampy ponds and streams in the vicinity of 
Oneida Lake. Recorded by Beauchamp under the name of 
elodes. It is said to feed on filamentous alex, desmids, and 
diatoms, and has been observed eating rotten fruit, decaying 
vegetables and dead animals, and has been known to attack a 
living leech. Palustris is eaten by the Common Whitefish. 
FamMILy SUCCINEIDA. 
Genus Succinea Draparnaud. 
638. Succinea avara Say. Fig. 45, No. 24. 
Observed only in the Oneida River on eat-tail leaves 
(Typha angustifolia). Listed by Beauchamp. 
64, Succinea retusa Lea. Not figured. 
Observed only in a pool on Frenchman Island, on leaf of 
Water Willow (Dianthera americana). A species of Suc- 
cinea has been noted in the stomach of the Yellow Perch. 
Retusa is not listed by Beauchamp. 
Faminry Hexicipm. 
Genus Potyeyra (Say) Pilsbry. 
65. Polygyra thyroides (Say). Not figured. 
This land snail was abundant on Frenchman Island, along 
the shore near the water, in damp or wet spots. It was 
observed feeding upon the nettle (Urtica). Listed by 
Beauchamp. 
2. IDENTIFICATION BY OPERCULA. 
When the stomach contents of fishes are examined it is 
often noted that the shells of the mollusks are badly broken 
and unrecognizable, but that the opercula (attached to the 
foot of the snail and serving to close the aperture of Proso- 
branchiate mollusks when the animal withdraws into the shell) 
