118 KANSAS UNIVERSITY SCIENCE BULLETIN. 



creases rather more rapidly than in recent specimens. Lawrence is the 

 farthest west the form lives in Kansas at the present time. 



19. Pyramidula cronkhitei cockerelli Pilsbry. 



One of the most abundant fossils. It can be collected by thousands. 

 It lives at the present time no closer than the mountains of central Colo- 

 rado. 



20. Helicodiscus parallelus Say. 

 Common in all the beds. 



21. Punctum pygmaeum Draparnaud. 



Rare; only a few specimens could be found, but owing to its small 

 size it may have been overlooked. 



22. Vallonia gracilicostata Reinhardt. 



An abundant fossil in all the deposits examined. 



23. Vallonia parvula Sterki. 



Five specimens were found in a deposit of loam, near the surface, 

 four miles east of Norton. This probably does not extend down into the 

 Pleistocene formation, and it is doubtful if it lives in the region at the 

 present time. 



24. Cochlicopa lubrica Miiller. 



A common shell in the Pleistocene beds. In Kansas this shell is rare 

 and does not live in the region at the present time. Hutchinson is appar- 

 ently the western limit. 



25. Sphyradium alticola Ingersoll. 



This form is specifically distinct from Sphyradium edentida. The 

 shell is much longer and the basal whorl is always expanded beyond the 

 others. The whorls in edentula are five to six, while in alticola there aie 

 seven to eight. 



Measurements of S. alticola. 



Alt. Diam. 



3.33 1.74 



2.81 1.11 



2.70 1.14 



The species is very common in the formation, and is said to live in the 

 mountains of Colorado at the present time. 



26. Sphyradium hasta Hanna & Johnston. PI., fig. 5. 



This form is rare in the deposits. The type is from the green marl 

 formation and is deposited in the U. S. National Museum. 



27. Pupilla muscorum Linnaeus. 



This is the most abundant fossil of the series. A very large number 

 were collected, in which considerable variation is found. The edentulous 

 form is the variety which occurs in greatest numbers, with those that 

 have a single nodule-like tooth on the parietal wall not far behind. Two 



