298 College of Forestry 
Famity HIrvupinipz. 
Hamopis marmoratis (Say) Moore. 
Stations XXXIIT and XXIII, on rocks and debris on 
shore at edge of water. In Maple Bay, Adams and Hankin- 
son found this leach on dead catfish which had been killed 
by the Lamprey Kel, the leeches being on and inside of the 
injured spot. This lec h, known as the Horse Leech, besides 
being a scavenger, eats earthworms, insects, mollusks: etc., 
as well as large quantities of mud containing organic matter 
(Moore, 1912, p. 112). 
Hemopis grandis (Verrill). 
This largest of American leeches was found in a rowboat 
at Brewerton by Adams and Hankinson. It is known to 
feed on snails. 
Faminty ERPOBDELLIDS. 
Erpobdella punctata (Leidy) Moore. 
Station I, habitat 2, station III, habitat 2, and station 
XXX, habitat 2, on vegetation and on stones near the shore 
(station X XX). 
PHYLUM ARTHROPODA. 
Crass CRUSTACEA. 
SUBCLASS ENTOMOSTRACA, 
Entomostraca are abundant in the plankton of Oneida 
Lake. As has already been stated no attempt was made in 
1915 to study the plankton, and the following list is based on 
the stomach contents of fishes caught in the lake. Species 
listed in the report of the Conservation Commission (see 
Bean, 1914, p. 352) from the ponds of the Oneida hatchery 
at Constantia, named by Mr. A. A. Doolittle, are also 
included. 
It is interesting to note the relative abundance of these 
Entomostraca in the hatchery pond. These were counted 
by Mr. Doolittle and his results are noted below: 
