GEOLOGY. 



603 



amongst these that we discover the gigantic Cerithium 

 {Cerithium giganteum, Lam.), Avhich attains a length 

 of fifty centimetres (nearly twenty inches), and a host 



r3. 



'^ThSi'f 



285. Fo.ssil .Shells of the Tertiary Epoch. 



1, Gigantic Ceritiiiuin. 2. Eicli.'imbered Helix. 3, TurriteUa imhricata (Lam.) 

 4, Rostdlaria macroptero, (Lam.) .5, RoHeNaria columbata (Lam.) 

 6, Cancdlaria cancellata (Boun. ) 7, Cerithium tliiara (Lam.) 



of other shells, in the most marvellous state of preserva- 

 tion, some of which are represented in the above en- 



gravmg. 



The vegetation of the tertiary epoch is remarkable for 



