78 College of Forestry 
resembled spines, the spires of the shells pointing upward. 
These animals were observed from six to twelve inches 
beneath the surface. The pond lily leaves afforded food and 
attachment for Planorbis, Acella, Physa, and Ancylus. 
Zone C. (Field Nos. 216, 217). 
MOLLUSCA. 
*Bythinia tentaculata, abundant, 
on bottom and plants. 
Amnicola lustrica, eommon, on 
bottom. 
Valvata bicarinata normalis, rare, 
on bottom. 
Spherium vermontanum, commen, 
on bottom im sand. 
Musculium securis, rare, on bottom 
in sand, 
*“Galba catascopium, not common, 
on plants. 
*Planorbis campanulatus, abun- 
dant, on bottom and plants. 
Planorbis antrosus, common, on 
bottom and plants. 
Planorbis hirsutus, rare, on bot- 
tom. 
Planorbis trivolvis, var., common, 
on bottom and plants. 
Physa ancillaria warreniana, rare, 
on plants. 
The two zones, B and C, overlap to some extent, but no 
Lymnea stagnalis lilliane were found in Zone C. Those 
species marked with an * were more abundant in Zone C than 
in Zone B. In Zone C Bythinia was notably abundant on 
the stems of Water Willow and Smith’s Bulrush. Spherium, 
Ammnicola and Planorbis campanulatus were abundant on the 
sandy bottom. This habitat evidently provides an excellent 
hunting ground for bottom feeding fish, such as pumpkin- 
seed, suckers, and catfish. 
In Zone C several thousand specimens were gathered from 
a depression beside a boulder, in 20 inches of water. This 
contained both dead and living material, mostly the former. 
Twenty-three species of mollusks are represented. The 
large number of individuals contained in this lot strikingly 
attests the great abundance of this class of animals in Oneida 
Lake. Those marked with an * are known especially to be 
eaten by fishes. 
MOLLUSCA. 
vermontanum,  abun- 
Elliptio complanatus, 8 specimens. 
Alasmidonta undulata, 1 specimen 
6 mill. long. 
*Spheerium 
dant. 
*Muscwlium securis, abundant, 
