PYRAMIDULA SHIMEKII. 143 



The following references show the previous history of 

 the name : 



Zonites shimekii Pilsbry, Proc. Acad. Nat. Sci. Phila. for 1890, p. 297. 

 Zonitoides shimekii Pilsbry, Nautilus, vol. xi, p. 131, March., 1898. 

 Pyramidula cockerellii Pilsbry, Nautilus, vol. xii, p. 85, Dec, 1898. 



The fossils in the author's collection are from the 

 following localities : 



Near Rome, Henry county, Iowa. (coll. Prof. T. E. 

 Savage). Very common. 



Columbus Junction, Louisa county, Iowa (coll. Prof. J. 

 A. Udden). Not rare. 



Iowa City, Iowa, several exposures. Quite common. 



Marshall county, Iowa, (coll. Prof. S. W. Beyer) . Rare. 



Story county, Kelley and Ames, Iowa (coll. of S. W. 

 Beyer). Rare. 



Carroll county, Iowa. Quite common. 



Woodbury county, Iowa. Rare. 



Monona county, Iowa. Rare. 



Pottawattamie county, Iowa, several localites. (coll. 

 Prof. J. A. Udden and the author). Widely distributed in 

 the county, but not common. 



Fremont county, Iowa. Quite common. 



Otoe county, Nebraska. Rare. 



Lancaster county, Nebraska. Not common. 



Saunders county, Nebraska. Quite common. 



Cuming county, Nebraska. Not rare. 



The last four localities bring the western range of the 

 fossils comparatively close to Colorado, the present eastern 

 limit of distribution of P. cockerellii. 



That this species should now be represented by living 

 colonies in regions quite remote from the deposits in which 

 the fossils occur is not remarkable, for other species 



