The Relation of Mollusks to Fish in Oneida Lake 81 
Habitat 3. 
Nymphwa-Pontederia Association. 
This habitat (Field No. 219) les west of the Typha asso- 
ciation. The vegetation is unusually thick. Fig. 26. 
Borrom: Sandy mud. 
WATER: 
12-24 inches deep. 
VEGETATION, 
Pickerel-weed 
data). 
Cow Lily (Nymphea advena). 
( Pontederia 
cor- 
Sweet-scented Water Lily (Cas- 
talia odorata). 
ANIMAL LIFE. 
MOLLUSCA. 
Lymnaea stagnalis lillianw, com- 
mon. 
Planorbis trivolvis, abundant. 
These mollusks were observed floating on the water, shell 
downward, or on the leaves of pond-lilies, or on the stems of 
Pickerel-weed. 
Near the T'ypha association a mud-bog is 
forming. In one spot the mass of dead vegetation, mud and 
living T'ypha have formed a trembling bog, floating on the 
surface. 
Habitat 4. (Field Nos. 209, 220, 221). Amn area com- 
paratively free from water plants, not far from shore, subject 
to moderate wave action, although protected by a zone of 
Water Willow about 100 feet from shore. 
Borrom: 
6-15 inches deep. 
Hard, stony and bouldery, on sand. Warer: 
ANIMAL LIFE. 
MOLLUSCA. 
Ancylus parallelus, in dead shells 
of clams, common. 
Planorbis hirsutus, 1 specimen, on 
rock, 
Planorbis campanulatus, 4 speci- 
mens, 1 distorted, on rocks. 
Planorbis binneyi, 3 specimens, 
young, on rocks. 
Planorbis antrosus, 2 specimens, 
on rocks. 
Galba catascopium, 
rocks, many young. 
common, on 
Physa ancillaria warreniana, com- 
mon, on rocks. 
Bythinia tentaculata, abundant, 
in dead shells of clams, mostly 
young. 
Amnicola lustrica, abundant, in 
dead shells of clams, mostly 
young. 
Campeloma integrum, 1 specimen, 
half grown, 
