MOLLUSCA 
Sphaerium (Musculium) partumeium, Say. (L). 
High Park. 
(Musculium) transversum, Say. High 
Park. 
(Musculium) truncatum, Linsley. Gren- 
adier Pond. 
Pisidium abditum, Haldeman. Centre Island, Gren- 
adier Pond. 
variabile, Prime. (L). 
“ 
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ce 
REFERENCES. 
Baker, F.C. The Lymnaeidae of North and Central 
America. Chicago Academy of Sciences. 
Special Publication No. 3. 1911. 
Baker, F. C. The Mollusca of the Chicago Area. 
Chicago Academy of Sciences, Bull. No. 3., 
1898-1902. 
Baker, H. B. Key to the Genera of Gastropoda of 
Michigan, Eleventh Report, Michigan Acad- 
emy of Sciences. 1909. 
Binney, W. G. Land and Fresh-water Shells of 
North America, Parts II and III, Smith- 
sonian Mise. Coll., vol. 7. 1865. 
Binney, W. G., and Bland, T. Land and Fresh- 
water Shells of North America, Part I, Smith- 
sonian Mise. Coll., vol. 8. 1869. 
Nicholson, H. A. Contributions to a Fauna Cana- 
densis. The Canadian Journal, New Series, 
vol. 13, 1872. 
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