TAB. XVIII. 



Fig. 

 1. 



Calyptraea Chinensis, page 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. 



Emarginula crassa,jy. 165. 



a. view of exterior. 



b. view of interior. 



c. side view of specimen with 



sharper ribs. 



d. side view, var. conica. 



3. Emarginula fissura,^. 164. 



a. side view, var. vulgaris. 



b. side view, var. punctura. 



4. Fissurella grseca, p. 168. 



a. side view, var. depressa. 



b. side view, var. convexa. 



c. side view, var. apertura. 



Fig. 



5. Cemoria Noachina, p. 166. 



a. view from above. 



b. view of interior, showing mus- 



cular impression. 



c. side view of same specimen. 



6. Tectura virginea, p. 161. 



a. side view, var. depressa. 



b. view of interior, showing mus- 



cular impression. 



c. side view, var. conica. 



7. Tectura fulva, /?. 161. 



a. view from above. 



b. side view. 



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



a. side view. 



b. view from above. 



