484 



MESOZOIC ERA— AGE OF REPTILES. 



Fig. 807. 



Fig. 809. 



Figs. 807-809.— Cretaceous Fishes— Teleosts : 807. Porthens. restored, 

 Beryx Lewesiensis. 809. Osmeroides Mantelli. 



(after Cope). 808. 



idly disappearing. In Europe, twenty-five genera of Cycloids and fif- 

 teen of Ctenoids are found in the Cretaceous (Dana). 



Palaeozoic Mesozoic Cenozoic 



Fig. 810.— Diagram representing the Distribution in Time of Placoids. 



Reptiles. — This class seems to have culminated about the end of 

 the Jurassic or the beginning of the Cretaceous period. If their re- 

 mains are more abundant in the Jurassic in Europe, they are far more 

 abundant in the uppermost Jurassic (Atlantosaur beds) and in the Cre- 

 taceous in America. In fact, we had here in America during the Cre- 

 taceous an extraordinary abundance and variety of reptilian life, in- 

 cluding all the principal orders already mentioned, viz., Enaliosaurs, 



