The Relation of Mollusks to Fish in Oneida Lake 111 
(Galba) catascopium and Gontobasis livescens. The sandy, 
protected areas yielded the greatest number of species, as was 
the case in Oneida Lake. ! 
There is a larger area of muck bottom in the Saginaw Bay 
region than has been found as yet in Oneida Lake. The pro- 
tected pools, sand dune lakes, and swamp localities are 
paralleled, to a degree, by the protected bays, shoals and 
swamps of Oneida Lake. 
5. Grorqtan Bay Rercton, Ontarto, Canapa (LAKE 
Huron). 
Recently an excellent census of the mollusks of Go Home 
Bay (Robertson, 1915, pp. 95-111), an embayment of 
Georgian Bay, has been published and is of interest when 
compared with the Oneida Lake fauna, although the 
ecological notes are not as full as could be wished. The area 
is made up of ponds, protected bays and exposed shores simi- 
lar in character to those of the Oneida Lake region. It is 
interesting to note that the same mollusks varied according 
to habitat as they were seen to do in the area under 
consideration. 
6. European LAKE STUDIES. 
The European ecologists have given much study to the 
inland lakes from a habitat standpoint, and examples could 
be cited of studies carried on by German, French, Swiss, 
English, Swedish, Danish and other students. Among the 
best of these studies from a habitat standpoint, though some- 
what old, is that by K. E. Sternroos (1898) who studied a 
Finnish lake, situated 40 kilometers (64.37 miles) north 
of Helsingfors. The lake is 2.5 kilometers (4.22 miles) long 
and about 1 kilometer (1.6 miles) broad, and reaches a depth 
of 53 meters (57.69 feet). This author recognized such 
habitats as the Scirpus region and the Hquisetum region, and 
the fauna described for these greatly resembles that found in 
Oneida Lake. The relation between plant zones and animal 
life is brought out clearly. The discussion of the Scirpus 
