170 



Mr. De la Beche on the Geology of Jamaica. 



ance agree with those of the central portion. This upper part contains the 

 fossil remains of the genera Conus^ Cerithium, Astarte, Natica, &c. ; and near 

 the sea coast in the parishes of St. Thomas-in-the-East^ Portland, St. George, 

 and St. Mary, a considerable quantity of corals, which frequently have almost 

 a recent appearance. 



The following is a list of the fossil organic remains which I procured from 

 the white limestone formation of Jamaica : 



1. Nautilus. 



3. Serpula. 



4. Conus. 



5. Buccinum. 



6. Pleurotoma. 



Multilocular Univalves. 



I 2. Nummulites. 



Univalves. 



7. Cerithium (two species), 



8. Turbo. 



9. Natica. 



Bivalves. 



10. Mya. 



11. Astarte. 



12. Cardita (two species). 



13. Area. 



14. Pecten (two species). 



15. Ostrea. 



16. Anomia (Lamarck). 



17. Terebratula. 



Echinites. 



18. Spatangus. 



19. Cidaris. 



21. Cellepora. 



20. Large and small spines 

 of Echinites. 



Corals. 



I 22. Astrea.* 



The cerithium figured in Plate XXL is of considerable size ; yet it will be 

 observed, that, when perfect, it must have been much larger. At one time, 

 I considered that it might have been a cast of a shell analogous to cerithium 

 giganteum ; the latter is however a much taller shell than the one under con- 

 sideration, which, in general outline, more resembles the C. Cornucopige of 

 Sowerby (Plate clxxxviii.). Being only a cast, it is, of course, very difficult 

 to refer our fossil to any particular species, and it is very probably a new one : 



* For the determination of those of the above which occur only as casts, I have to acknow. 

 ledge myself indebted to Mr. Miller, author of the " Natural History of the Crinoidea." 



