TAB. XVII. 



Fig. 



1. Capulus obliquus, j?;flye 156. 



a. view of exterior. 

 h. xaew of interior. 



2. Capulus imgaricus, J?. 155. 



a. side view, var. regvilaris. 



b. view of interior, var. unguis. 



c. view of exterior ,, 



d. view of interior, var. Aiilgaris. 



e. view of exterior, same specimen. 

 /. var elata, side -^aew. 



ij. id. interior view of another specimen, showing the 

 muscular impression. 



3. Capulus militaris,j?;. 156. 



a. Aaew of interior of var. partim-sinuosus. 

 h. view of exterior of same specimen. 



c. internal -vaew of a laterally compressed specimen. 



d. internal view of a laterally expanded specimen. 



e. lateral view of young specimen, the volution on a level 



with the base. 

 /. lateral view of an elevated specimen, 



4. Capulus fallaXjj?;. 157. 



a. view of exterior. 

 h. view of interior. 



