The Relation of Mollusks to Fish in Oneida Lake cit 
Zone C. Bulrush-Water Willow Association. 
30TTOM: 
Water: 2-3 feet deep. 
American Bulrush (Scirpus ameri- 
canus). 
Smith’s Bulrush (Scirpus smithii). 
Borrom: 
Water Willow (Dianthera ameri- 
Hard, sandy with an occasional boulder. 
Water Willow (Dianthera ameri- 
cana). 
Pickerel-weed  (Pontederia  cor- 
data). 
Zone D. Pure Water Willow Association. 
Hard, sandy. Warrer: 2-4 feet deep. 
Lake Bulrush (Scirpus — ocet- 
dentalis ) . 
cana). 
ANIMAL LIFE. 
Zone B. 
(Field Nos. 214, 215.) Fig. 24. 
MOLLUSCA. 
Anecylus fuscus, wider side of pond 
lily leaves, common. 
Acella haldemani, on Scirpus 
smithii and on under side of 
pond lily leaves, common, 
Lymnea_ stagnals lilliane, egg 
capsules on lily leaves. 
Lymnea stagnalis lilliane, abun- 
dant on bottom, near shore. 
Galba catascopium, rare, on the 
bottom. 
Planorbis  trivolvis, 
the bottom. 
Planorbis campanulatus, common, 
on all vegetation and on the bot- 
tom. 
Physa ancillaria warreniana, rare, 
on vegetation. 
Bythinia tentaculata, not common, 
on Scirpus and Dianthera. 
Amnicola limosa, rare, on the bot- 
tom. 
common, on 
INSECTA. 
Caddis-fly cases (Helicopsyche  Caddis-fly cases (Leptocella spe- 
borealis). cies). 
Caddis-fly larve (Platycentropus Dragon-fly nymph (Gomphus sor- 
maculipennis) . didus) . 
Lymnea and Planorbis were observed on the bottom and on 
stems of Water-Lily, Arrow-head, Pickerel-weed, and leaves 
of water lily. The best Lymnaea habitat was a strip about 20 
feet wide bordering the shore (Fig. 25), where the bottom 
was of soft, brown material (detritus, see Chapter III). The 
water lily societies occurred in holes about two feet deep, 
which were scattered over this habitat. Acella was abundant 
on lily leaves and especially on Scirpus smithw, where they 
