PLATE VII. 



Fig. 



1. Chemnitzia Hamptonensis, p. 50. 



la. — — magnified. 



2. Cerithium limseforme, p. 30. 



3. — sexcostaturn, p. 30. 



3a — — magnified. 



4. Chemnitzia Leckenbyi, p. 50, magnified. 



5. — Wetherellii, p. 50. 



5a. — — magnified. 



6. Nerinsea Eudesii, p. 33. 



6a. — — magnified. 



7. Nerinsea Voltzii, jo. 32, young. 



7a. — — section magnified. 



8. Nerinsea Dufrenoyi,j». 34. 



8a. — — magnified. 



83. — — section magnified. 



8c, 8c. — — p. 34, another variety. 



Sd. — — portion magnified. 



9. Nerinsea Stricklandi,jo. 35 



9a. — — portion magnified. 



10. 10c. Nerinsea punctata, p. 35. 



10a. — — portion of external surface magnified. 



103. — — section magnified. 



11. Nerinaea Voltzii, p. 32. 



11a. — ■ — section. 



12. Nerinsea funiculis, p. 36. 



12a. — — portion of the surface magnified. 



123. — — section magnified. 



13. Chemnitzia Lonsdalei, p. 49, the young shell. 

 13a. — — the adult shell. 



14. Cerithium Roissii, p. 32. 



14a. — — section of the shell. 



15. Chemnitzia simplex, p. 49, reduced one half. 



