The Relation of Mollusks to Fish in Oneida Lake 297 
described, and in two cases beautifully figured by Moore 
(1901, 1906, 1912). 
Faminy GLosstPHONID®. 
Glosstphonia stagnalis (Linn.) Johnston. 
Station I, habitat 2, on leaves of Water Lily (Nymphoa 
and Castalia). Known to feed on Pisidium, and itself eaten 
by the larger leeches, sunfish, perch, and other small carniv- 
orous fishes (Moore, 1912, p. 79). 
Glossiphonia fusca Castle. 
Station I, habitat 2, on leaves of Water Lily (Nymphoa 
and Castalia). Said to live almost exclusively on the smaller 
snails. It frequently attaches itself to the shells of Lymnea 
and other large snails (Moore, 1912, p. 81). 
Glossiphonia complanata (Linn.) Johnston. 
Station IIT, habitat 3, under stones. This species is known 
as the snail leech, and feeds on small snails, worms, ete. 
Placobdella parasitica (Say) Moore. 
Station VII, on the back of turtles (Snapping Turtle 
and Painted Terrapin) upon the blood of which it feeds. At 
station XX XIII it was found on stones near shore. 
Placobdella rugosa (Verrill) Moore. 
Station IIT, habitat 3, clinging to stones. 
Placobdella phalera Grat. 
Young leeches thought to be this species were collected at 
station X XI, habitat 2. 
Placobdella picta Verrill 
Station I, habitat 2, and station XL, in submerged 
vegetation. 
