326 walker: shells of Michigan. 



of the shells of the state, and three of the species of particular 

 districts. 



Dr. Abram Sager, Zoologist of the Geological Survey, pub- 

 lished the first catalogue in 1839. 



The second, a very complete list, by Dr. M. Miles, State 

 Zoologist, was published in the " Report of the Geological Survey 

 for i860." 



And in 1868 Mr. A. O. Currier, at the request of the Kent 

 Scientific Institute of Grand Rapids, Michigan, compiled a ''List 

 of the Shell-bearing Mollusca of Michigan, especially of Kent and 

 adjoining counties." 



Mr. Currier had already published in 1859 a "List of the 

 Shells collected in the Grand River Valley." As this list however 

 was undoubtedly included in his later catalogue, the few particulars 

 in which they differ are not mentioned in present list, and all 

 references are to his catalogue of 1S68. 



In the "Report of the United States Fish Commission for 

 1872-3," Mr. Sydney J. Smith in a "Sketch of the Invertebrate 

 Fauna of Lake Superior" gives a list of the mollusks of that region, 

 which while largely a compilation from the publications of Binney 

 and Gould, includes the results of a series ofdredgings made under 

 the direction of the United States Lake Survey, and is especially 

 valuable in showing the depths at which the various species were 

 found. A preliminary report of the same dredgings are published 

 in vol. 2 of the "Report of the Secretary of War for 1871." 



In 1875, at the request of the Ann Arbor Scientific Associa- 

 tion, Mr. C. E. Beecher and myself compiled a list of the species 

 found in the immediate vicinity of Ann Arbor, Michigan, which 

 was published in the Proceedings of the Association for 1875-6. 



In the main, however, the present list is based on my own 

 collection, and unless special reference is made to some published 



J.C, ii. Nov., 1S79 



