10. cretielata, Oliv. 



11 T Polyphemus Bruguireus. 



12. Ampullaria (found in bituminous marl above a mine of fossil ct>#/. 



13. . . compressed laterally ; giving it an accidental, elongated form. 



14. . . . . vertically ; changing the form of the mouth, and 



giving it the appearance of another species. 



15. Turbo lugubris, Ghemn. 



16. Section of a Pyramidella, to shew the columella. 



17. Turritella. (au jour). 



18. Cyclostoma bulimoides, Oliv. 



