The Relation of Mollusks to Fish in Oneida Lake 227 
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3. Lrrcurs as Enemirs or Motrtuusks. 
Mollusks form a large part of the diet of leeches and 
these in turn are eaten by many fish. Moore (1901, 1912) 
records upward of eight species as subsisting to a greater or 
less degree upon fresh-water mollusks. These species are 
listed below with the page reference to their description in 
the work cited. 
Glossiphonia complanata (Linn). Johnston. 
Feeds chiefly on small snails and annelids. Pages 493 
(1901), 83 (1912). | 
Glossiphonia stagnalis (Linnaeus). Johnston. 
Favorite food small annelids and gastropods (1901, p. 
498). Kats small annelids, insect larvae, snails, Pisidiwm 
and its allies, and dead bodies. Food of sunfish, perch, 
and other carnivorous fishes. Also eaten by snipe and sand- 
pipers (1912, p. 79). 
Glossiphonia nepheloidea (Graf). 
Will eat snails and worms but prefers to suck blood (1912, 
Bei). 
Glossiphonia fusca Castle. 
Attaches itself to shells of the larger species of Lymncea 
(1912, p. 81). 
Heamopis marmoratis (Say). 
Feeds on gastropods and lamellibranchs (1901, p. 527). 
Hemopis grandis (Verrill). 
Feeds on snails (1912, p. 120). 
Placobdella montifera Moore. 
Enters shells of living mussels, though it is not known 
definitely that it feeds on their soft tissues (1912, p. 89; 
1901, p. 504). 
Nephelopsis obscura Verrill. 
Feeds on snails (1912, p. 125). 
