The Relation of Mollusks to Fish in Oneida Lake 51 
Where the water becomes shallower, in spots 2-214 feet 
deep, the Water Willow grows abundantly. Mollusks were 
noted here in but one situation. Physa ancillarta warreniana 
was observed on the upper surface of Castalia odorata. 
A leech, Placobdella parasitica, was obtained from turtles 
caught in a fyke net at mouth of west creek flowing into 
Big Bay. Collected by Adams and Hankinson, Sept. 9, 
1915. 
Sration VII. Brea Bay Creex (Frerp No. 270). 
Big Bay Creek extends for over a mile into the swampy 
shore bordering the east side of Big Bay. At its mouth the 
water is five feet in depth and about 20 to 25 feet in width. 
As the water extends into the country for a long distance, 
forming a vast swamp, it is impossible to judge of the original 
size of the creek. The bottom is of fine, sandy silt. The 
vegetation is zonal in arrangement. 
Zone A. Shallow water (12-18 inches). This zone evi- 
dently represents the old shore line before the raising of the 
water table. 
' Black Willow (Salia nigra var.  Broad-leaved Arrow-head (Sagit- 
falcata). taria latifolia). 
Swamp Loosestrife (Decodon verti- 
cillatus ) . 
Zone B. Water five feet deep. 
Cow Lily (Nymphaea advena). Clasping-leaved Pond-weed  (Po- 
Floating Pond-weed (Potamogeton tamogeton perfoliatus) . 
natans). 
ANIMAL LIFE, 
Animal life was observed on the upper and under surfaces 
of the Cow Lily. The species all belong to the Mollusea. 
Pseudosuccinea columella. Physa ancillaria warreniana. 
Planorbis campanulatus. Physa gyrina. 
Adams and Hankinson collected leeches, of the species 
Placobdella parasitica, from turtles caught in a fyke net set 
near the mouth of Big Bay Creek, Sept. 4-7, 1915. 
