AGE OF REPTILES. 



247 



and many of them were 

 monstrous in size and 

 extraordinary in char- 

 acter. 



352. Ammonites and 

 Belemnites. Of the 

 Mollusks, these are the 

 most prominent and 



peculiar. They belong to the class called Cephalopods 

 ( 286). The Ammonites, which began in the Triassic 

 period, were now very abundant, their beautiful shells 



1. Ammonites Jason. 2. A. Communis. 3 A. Bucklandi. 4, 5, 6. Belemnites. 

 7. Belemnoteuthis. 



Fig. 147. 



appearing in hundreds of forms, with every variety of 



