IOWA CITY LOESS. I97 



RECENT AND FOSSIL MOLLUSCS AT IOWA CITY. 

 1. Species here found only as fossils. 



**Pyramidula shimekii (Pils.) Shim. 



Quite common in the loess of Iowa City, which furnished 

 the type specimens. A more complete discussion of this 

 species is given on pp. 139-145 of this Bulletin. 



**Pyramidula strigosa iowensis Pils. 



This variety is now extinct. All other forms of this 

 extremely variable species however belong to the dry 

 western plateaus and mountains. It is locally quite com- 

 mon in the loess, and the type specimens were from this 

 locality. 



**Pupa muscorum (L.) . 



Now living in the U.S. from Maine to Montana, thence 

 to Nevada. Also in Europe. Not rare in the loess. 



**Pupa blandi (Morse) Binn. 



Two specimens were recently found in the loess near 

 Iowa City. It is not rare in the western loess, and is 

 found living from New Mexico to Montana. The shells 

 usually formerly reported under this name are Bifid aria 

 pentodon(?) . The easternmost localities from which fossils 

 have been received are Muscatine and Stockton in Musca- 

 tine county, Iowa. They were erroneously reported as 

 P. muscorum . * 

 **Vallonia gracilicosta Reinh. 



Quite common in the loess. It is common in western 



* Through the writer's error they were so reported in Prof. Udden's 

 note on Hershey Ave. fossils in Leverett's Report in U. S. Geol. 

 Sur. vol. xxxviii, p. 174, 1899. In that list P. blandi should be 

 substituted for P. muscorum. Also in Udden's Report, la. Geol. 

 Sur., vol. ix, p. 359, 1899, where the same substitution should be 

 made in the Fulton township (Stockton) list. P. muscorum does 

 however occur at Muscatine. 



