The Nautilus. 



Vol. VI. JUNE, 1892. No. 



THE SHELL BEARING MOLLITSCA OF MICHIGAN. 



BY BRYANT WALKER, DETROIT, MICH. 



In the ten years which have elapsed since the last catalogue of 

 Michigan shells was published, many sjDecies have been added to 

 the fauna of the State and our knowledge of the distribution of 

 others has been very largely increased. While it is not probable 

 that in the future the number of species will be largely added to, 

 there yet is abundant opportunity for our local collectors to add to 

 what must be admitted to be, on the whole, a meagre knowledge of 

 the exact range of the different species within our borders. Every 

 local list, carefully compiled, has its value ; and if the publication of 

 this paper shall, by its incompleteness, serve, to provoke the publica- 

 tion of the information already in the possession of the different 

 collectors scattered over the state, it will have accomplished not the 

 least of the purposes of its compilation. 



The first catalogue of Michigan shells was published by Dr. 

 Abram Sagar, Zoologist of the Geological Survey, in 1839, and 

 enumerated seventy-six species. 



The second, by Dr. Manly Miles, State Zoologist, was published 

 in the "Report of the Geological Survey for 1860." 



The third was compiled in 1868 by Mr. A. O. Currier, of Grand 

 Rapids, and was published as one of the " Miscellaneous Publica- 

 tions of the Kent Scientific Institute." 



• In 1879 the writer published a fourth list in the Journal of 

 Conchology, Vol. 2, p. 325. 



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