1901.] NATURAL SCIENCES OF PHILADELPHIA. 187 



and less rostrate, also in having a predominance of concentric 

 sculpture in the median portion of the valve; the posterior end 

 radially closely ribbed, narrower lunule and much finer crenula- 

 tion of the ventral margin. The crenulation of the margins inside 

 is much like V. marica. 



EXPLANATION OF PLATE V. 



Fig. 1. — Vivipara henzadensis Pils., p. 188. 



Fig. 2. — Ampullaria winkleyi Pils., p. 189. 



Fig. 3. — Ampullaria winkleyi, operculum. 



Figs. 4, 5. — Venus malo7iei Yan., p. 185. 



Figs. 6, 7. — Tornatiria bermudensis Vau., p. 183. 



Fig. 8. — Haminea succinea var. soUdior Van., p. 182. 



Fig. 9. — Atys sharpi Vau., p. 183. 



Figs. 10. 11. — Lucina (Divaricella) dalliana Vau., p. 184. 



Fig. 12. — Haminea zanzibarica Van., p. 182. 



Fig. 13. — Fossarus capensis Pils., p. 190. 



Figs. 14, 15. — Lucina (Divaricella) huttoniana Van,, p. 184. 



