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). 



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 Misc. Coll., vol. 7. 1865. 



Binney, W. G., and Bland, T. Land and Fresh- 

 water Shells of North America, Part I, Smith- 

 sonian Misc. Coll., vol. 8. 1869. 



Nicholson, H. A. Contributions to a Fauna Cana- 

 densis. The Canadian Journal, New Series, 

 vol. 13, 18T2. 



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