BIBLIOGRAPHY.* 
Adams, Charles C. 
1900. Variation in Io. Proc. Amer. Assoc. Ad. Sci., XLIX, pp. 
208-225. 
1906. An Ecological Survey of Northern Michigan. Rep. State 
Board Geol. Surv. Mich., 1905. 
Atwood, Wallace W., and Goldthwait, James W. 
1908. Physical Geography of the Evanston-Waukegan Region. 
Bull. Ill. Geol. Surv., VII. 
Baker, F.C. 
1898-1902. The Mollusca of the Chicago Area. The Pelecypoda, 
1898; the Gastropoda, 1902. Parts I and II. Bull. No. III, 
Nat. Hist. Surv. Chicago Acad. Sci. 
1901. The Molluscan Fauna of the Genesee River. Amer. Nat. 
XXXV, pp. 659-664. 
1906. Notes on a Collection of Mollusks from the Vicinity of 
Alpena, Michigan. Trans. Acad. Sci. St. Louis, XVI, No. 2. 
Cowles, H. C. 
1901. The Plant Societies of Chicago and Vicinity. Bull. Geo- 
graphic Society of Chicago, No. 2. 
Dall, William H. 
1896. Insular Land-shell Faunas, especially as Illustrated by the 
Data obtained by Dr. G. Baur in the Galapagos Islands. Proc. 
Acad. Nat. Sci. Phil., 1896, pp. 395-459. 
Call, R. Ellsworth. 
1884. On the Quaternary and Recent Mollusca of the Great 
Basin, with Descriptions of New Forms. Bull. U. S. Geol. 
Surv., No. 11 (Vol. II, pp. 357-420). 
*The bibliography consists of the works cited in the foregoing pages, and 
of a few papers on the Mollusca in which more or less emphasis is laid on 
ecology. The list is not exhaustive. 
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