442 



MESOZOIC TIME. 



The Teliosts or Osseous fishes are supposed also to have had here 

 their first species ; but they were little numerous, compared with the 

 other kinds, or with their abundance in the next, or Cretaceous, period. 



Figs. 803, 804. 



GrANC 



ame ; 804 



Aspidorhyncus (XX). fr° m tlle Oolyte. 

 Figs. 805-810. 



Reptiles— Fig. 805, Ichthyosaurus communis ( x T £ ¥ ) ', 806, Head of same (X-gV); 807 a, b 

 view and section of vertebra of same (X#); 808, Tooth of same, natural size ; 809, Plesiosaurus 

 dolichodeirus ( X-Ar) j 810 a, 810 b, view and section of vertebra of same. 



Reptiles. — During this era, the Reptilian type underwent an 



