Fossils of the Calcifeious SandrocTc. 



361 



CEPHALOPODA. 



Genus orthoceras, (Breyn). 



The Orthoceratites of the Calciferous Sandrock and Chazy 

 have the same aspect as a group, and appear to be numerous, but 

 are usually in a very bad state of preservation. Most of them 



a 



Fig. 11. 

 Orthoceras Becki. 



Orthoceras multicameratum ? Siphuncle. 



Orthoceras Montrealensis. d Section shewing position of 

 siphuncle. e Longitudinal section. 

 f — g Orthoceras Lamarcki. h Section. 

 i — k Orthoceras sordidum. 



Orthoceras deparcum. 



