TAB. XVIII. 



Fig. 



1. Calyptraea Chinensis, j»«ye 159. 



a. exterior of var. muricata. 



b. interior of same specimen. 



c. side view, var. conica. 



d. side view, var. depressa. 



e. side view, var. spinosa. 



2. Emarginula crassa,ji9. 165. 



a. view of exterior. 

 h. view of interior. 



c. side view of specimen with 



sharper ribs. 



d. side \aew, var. conica. 



3. Emarginula fissura, ^;. 164. 



a. side view, var. vulgaris. 



b. side view, var. punctura. 



4. Fissurella graeca,^. 168. 



a. side view, var. depressa. 



b. side view, var. convexa. 



c. side view, var. apertura. 



Fig. 



5. Cemoria Noachina, j??. 166. 



a. view from above. 



b. \'iew of interior, showing mus- 



cular impression. 



c. side view of same specimen. 



6. Tectura virginea, ^. 161. 



a: side view, var. depressa. 



b. view of interior, showing mus- 



cular impression. 



c. side view, var. conica. 



7. Tectura fidva, JO. 161. 



a. view from above. 



b. side view. 



8. Tectura(?) parvula,jy. 162. 

 a. side view. 

 h. view from above. 



