HANNA AND JOHNSON: MOLLUSKS OF KANSAS. 121 



35. Succinea grosvenori Lea. 



An abundant fossil, and found living- continuously along- the bluffs 

 of Miocene exposures. Some of the shells are very large, reaching 

 19 mm. in altitude and 13 mm. in diameter. These are some of the 

 heaviest Siiccineas in the country. The heavier shells intergrade per- 

 fectly with the smaller, lighter ones, so it is supposed that the larger 

 ones are only older individuals. 



36. Succinea avara Say. 



Very common in all the beds. The shells are normal and do not 

 live nearer than central Colorado or eastern Kansas at the present time. 



37. Succinea sillitnani Bland. 



Rare; only about a dozen specimens found. 



38. Carychium exile canadense Clapp. 



Naut. XIX, p. 138; pi. VII, figs. 1, 2, 6, 7; Apr., 1906. 



This form is rare in the deposits. Only a few were found, and 

 they agree with the form above except in being more slender and the 

 internal basal ridge is more strongly developed than the figures show. 

 The strias are not numerous, but are high and coarse and resemble ribs 

 on the body whorl, but they are not uniform and regular. 



S-Univ. Sci. Bull.. Vol. VII, No. 3. 



