Number 7- February 20, 19 15. 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan. Pubushed by the University. 



RESULTS OF THE AIERSHON EXPEDITION TO THE 

 CHARITY ISLANDS, LAKE HURON. 



MOLLUSCA. 



P>Y Bryant Walker. 



The molluscan fauna of the Charity Islands, as represented 

 by the collections made by the several members of the Mershon 

 Expedition^ of 1910, is not an extensive one, consisting of only 

 thirty-five species, of which nine are terrestrial and twenty- 

 six are aquatic. i\s would naturally be expected, it is, as far 

 as it goes, the same as that of the sand dune region of the south 

 shore of Saginaw Bay- and that of the mainland to the north 

 and west.^ Since there are no streams on the islands, the 

 species characteristic of such an habitat are, of course, lack- 

 ing, except as a few have found a suitable home in the pond in 

 tlie interior of Charity Island. The aquatic fauna found along 

 the shores of the islands is the same as that which occurs all 

 along the Lake Huron coast from vSaginaw Bav to Mackinaw 

 City. 



^ A list of t'le published reports of this expedition is given at the end of 

 this paper. 



= Baker, H. B., Pub. 4, Biol. Sen 2, Mich. Geol. & Biol. Sur., igir. 121. 



3 Walker, Bryant, Naut., VII, 1S94, 125, and Baker, F. C, Trans. Acad. 

 Nat. Sci. St. Eou'is, XVI, 1906, i. 



Scientific Paper.s of the Univeksity of Michigan No. 7. 



