WITH DESCRIPTIONS OF SOME OF ITS ORGANIC REMAINS. 259 



Cerethium, Terebratula, &c. From the white limestone of Matanzas I have some 

 of the same generic forms, and have no doubt of their common origin. 



In regard to this white limestone, I should agree with De la Beche, 

 certainly, in not placing it below the Tertiary period. At the same time, we 

 must not confound the rock containing these "casts" with the rocks contain- 

 ing the shells of the genera Terehratula, &c. These latter are, I think, of a 

 different origin. 



For the casts in my possession I propose the following names : — 



Nautilus Cubaensis. Plate X., Fig, 15. Cast of the chamber. 

 Area Sillimaniana. Plate X., Fig. 16. » 



Cucullea dubia. Plate X., Fig. 17. 

 Chama tortuosa. Plate X., Fig. 18. 

 Cardium globosum. Plate X., Fig. 20. 

 " depressum. Plate X., Fig. 21. 

 Conns, latus. Plate X., Fig. 19. 



Terebratula Tayloriana. Plate X., Fig. 12. 



Testa triangulari, sulcis longitudinalibus impressis ; valvd inferiore in superiorem reflexa ; margine 

 biplicato. 



Shell triangular, with impressed longitudinal furrows ; the inferior valve reflected into the superior one ; 

 margin doubly folded. 



Found near Havanna, Cuba. Mons. Poey. 



My Cabinet. 

 Diam. .7, Length 1, Breadth 1.2 inches. 



Remarks. — This is an interesting species, and so much like one (name un- 

 known to me) which I have from the Oolite of Dundry, England, that it can 

 scarce be said to differ from it. It seems, however, to be a larger species, and 

 the great flexure of the margin is more oblique. The very bad figure, PI. 

 VIII., Fig. 15, of Young's " Geological Survey of the Yorkshire Coast," has 

 some resemblance to it. As, also. Dr. Fitton's fine figure of Terehratula con- 

 vexa. " Strata Below the Chalk," PI. XIV., Fig 12. I name this after R. 

 C. Taylor, Esq., the Geologist. 



