The Relation of Mollusks to Fish in Oneida Lake 83 
spots by the thickness of the colonies of Water Willow, which 
form a dense barrier 20-25 feet from the shore. 
27.) 
(See Fig. 
MOLLUSCA. 
Elliptio complanatus, abundant, 
between rocks. 
Margaritana margaritifera, 
between rocks. 
Lampsilis radiata, common, be- 
tween rocks (gravid). 
Lymnaea stagnalis lilliane, abun- 
dant, on rocks, near shore. 
rare, 
Galba catascopium, 
rocks and plants. 
Planorbis  binneyt, 
rocks, near shore. 
Planorbis campanulatus, common, 
on rocks and plants. 
Physa ancillaria warreniana, com- 
mon, on rocks and plants. 
common, on 
common, on 
Lymnea stagnalis lillane, egg 
capsules on water plants. 
CRUSTACEA. 
Crawfish (Cambarus propinquus), male, of I form. 
INSECTA. 
Water-penny, larve of beetle Caddis-fly larve  (Helicopsyche 
(Psephenus lecontei), on rocks. borealis), common, on rocks. 
HIRUDINEA. 
Leech (Hamopis marmoratis) . 
IV. The Outlet, Brewerton. 
The original character of the outlet, or that part of the 
lake which narrows into the Oneida River, has been greatly 
modified by the Barge Canal. In the portion bordering the 
north shore a channel 12 feet deep has been dredged for the 
Barge Canal. The material taken from this channel has been 
dumped in the outlet bordering the south, or Brewerton 
shore, changing portions of the outlet from comparatively 
deep, vegetation-filled water (5-10 feet) to a very shallow 
(1-3 feet) sandy condition. 
Station XXXIV. (Frerp No. 
ArTrIFIcIAL IsLANDs. 
235). Fra. 29. 
1-3 feet deep. 
Borrom: Hard, sandy or stony. WATER: 
