46 College of Forestry 
Habitat 3. Rounded points separating No. 2 habitats. 
The shores of these locations are bare; in one place the lake 
had undermined the shore, forming an overhanging bank 
about one foot above the water. The base of this bank, in a 
few inches of water, was the optimum habitat of Campeloma 
integrum. Where this bank was absent there was a sandy or 
gravelly beach. ‘Two conspicuous zones or areas are apparent. 
Zone A. (Field No. 250.) 
Overhanging or vertical bank; water six inches deep; bot- 
tom sandy or stony; no vegetation, but in one place water 
celery had been washed on shore forming a mat in which 
mollusks were abundant, eating the plant. 
MOLLUSCA. 
Campeloma integrum, abundant. Planorbis binneyi eating celery, 
Lymnaea stagnalis lilliane, eating common. 
celery, rare. Physa ancillaria warreniana, eat- 
jalba catascopium, eating celery, ing celery, rare. 
Tare. 
Zone B. (Field Nos. 223, 263.) 
30TrTTom: Hard sand with rocks and boulders. WarrEr: 
12 to 36 inches deep. 
VEGETATION. 
Lake Bulrush (Scirpus occiden-  Pickerel-weed (Pontederia  cor- 
talis) . data). 
American Bulrush (Scirpus ameri- Water Celery (Vallisneria spir- 
canus) . alis). 
MOLLUSCA. 
Physa ancillaria warreniana, on Goniobasis livescens, on _ rocks, 
rocks, abundant. abundant. 
Planorbis campanulatus, on Seir- EHlliptio complanatus, between 
pus and wild celery, common. rocks in sand, common. 
Planorbis hirsutus, on Scirpus and Lampsilis radiata, in sand, not 
wild celery, rare. common. 
Galba catascopium, on _ rocks, Anodonta cataracta, in sand, not 
abundant. common, 
CRUSTACEA, 
Crawfish (Cambarus propinquus). Under stones; male of form T. 
