Number 98 April 9, 1921 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



MOLLUSCA OF NORTH DAKOTA 



By Mina L. Wixslow 



North Dakota has received Httle attention from concholo- 

 gists. a fact probably accounted for largely by the character 

 of the country. Scattered notices of shells from the border- 

 ing states of Montana and Miimesota have appeared from 

 time to time, Hanham^ lists the land and freshwater shells of 

 2\Ianitoba. Over'- enumerates the mollusks of South Dakota, 

 but for North Dakota proper only one short list by Daniels"' 

 has been published. Dall's volume on the Alaskan fauna^ 

 includes of course many species whose range extends across 

 the state of North Dakota, but specific records for the state 

 are not given. The present pap'^r is intended, therefore, as 

 a contribution to a knowledge of the fauna of this semi-arid 

 region. Conditions vary so much within the limits of the 



^ Xaiitiliis, XIII, 1899, pp. 1-6. 

 'Wautilus, XXIX. 1915, pp. 79-81. 90-95. 

 ^Nautilus. XXXIV, 1920, p. 29. 



* Harriman Alaska Expedition, XIII, Land and Fresh water ^lol- 

 lusks, 1905. 



