LONDON CLAY. 269 



11. Fusus longcBvus. Mm. Conch. Tab. Ixiii. 



The specimens in my possession are very small, not exceeding three 

 inches in length. There can however be no doubt of their belonging to 

 this species. 



12. Solarium canaliculatum. (Lamarck). Foss. Hant. figs. 7, 8. 

 This elegant httle shell is about 0-3 inch in diameter. The spu'e is 



depressed, and deeply umbilicated. The volutions are subrotund, and 

 spirally striated; the striae crenulated; the outer margin of the wreaths 

 acute; aperture round. 



13. Melania costellata. (Lamarck). Foss. Hant. fig. 27. 



14. sulcata. Min. Conch. Tab. xxxix. 



This is a fine spiral shell, sometimes attaining eight inches or more in 

 length, having from thirteen to fifteen whorls. It is spirally striated, and 

 has a sulcus, or groove, between each wreath. 



15. Pleurotoma , fragments of an unknown species. 



16. TuYiitella multisulcata. (Lamarck). 



17. conoidea. Min. Conch. Tab. U. figs. 1, 4. 



18. elongata. Min. Conch. Tab. li. fig. 2. 



Pyritous casts of TurritellcB are very frequent. 



19. Murex argutus. Foss. Hant. fig. IS. 



20. Dentalium entalis? 



These DentaHtes bear a close resemblance to the recent species; but 

 there are some doubts as to their identity. 



21. Cerithium giganteum. Min. Conch. Tab. clxxxviii. fig. 2. 



22. Nummuhtes IcBvigata. Parkinson's Org. Rem. Vol. iii. PI. x. fig. 

 IS. 



These are small, circular, multilocular shells, nearly smooth, and slightly 

 convex on both sides. M. Cuvier considers the Nummulites to be charac- 

 teristic of the lower beds of the Calcaire grassier. " Elles se trouvent, 

 toujours dans les parties les plus inferieures*." 



* Geograph. Min. p. 23. 



