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. mariea. 



EXPLANATION OF PLATE V. 



Fig. 1. Vimpara henzadensis Pils., p. 188. 



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



Fig. 3. Ampullaria winkleyi, operculum. 



Figs. 4, 5. Venus maloneiV&n.., p. 185. 



Figs. 6, 7. Tornatlna bermudensis Vaii., p. 183. 



Fig. 8. Haminea succinea var. nolidior Van., p. 182. 



Fig. 9. Atys sharpi Van., p. 183. 



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



Fig. 12. Haminea zanzibarica Van., p. 162. 



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



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



