36 College of Forestry 
CHAPTER II. DESCRIPTION OF THE HABITATS 
AND THEIR MOLLUSCAN POPULATION. 
In order that an accurate picture might be formed of the 
different environments in the lake, field stations or habitats 
were established in many places, from the outlet at Brewer- 
ton to Constantia on the north side of the lake and from 
Brewerton to Lower South Bay on the south shore. Several 
islands and the deeper water were also investigated. Detailed 
studies were made of these stations, in relation to their 
mollusean inhabitants, as well as to the associated biota, to 
the depth of water, and to the character of the bottom. 
Ample material was gathered, and more or less exhaustive 
field descriptions of the habitats were made. By this 
means it has been possible to form a very full and 
comprehensive idea of the number of species and relative 
abundance of the molluscan life in the lake, its relation to 
the feeding and breeding grounds of the fish and its adapta- 
bility to the needs of the mollusk-eating fish. 
A. DETAILED DISCUSSION OF FIELD STATIONS. 
For convenience the data will be considered under four 
heads: 1. North Shore Stations; 2. South Shore Stations; 
3. The Islands in the Lake; and 4. The Deeper Water and 
Open Lake Vegetation. 
I. North Shore from Brewerton East to Constantia. 
Station I. Nicuorson Bay (Fie. 4). 
This bay contains two characteristic and diverse habitats. 
Habitat 1. West side of bay, Fig. 5 (Field or collection 
No. 266). 
Borrom: Hard sand, with few boulders, several very 
large. Warrr: From 12 to 30 inches deep. 
VecetTation: Water Williow (Dianthera americana). 
Near the shore there is a small association of Narrow- 
leaved Cat-tails (Typha angustifolia) and sedge (Carex 
a. & 
