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. 





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4BHT 



SBBhjk 



! 



,..„j»:;iiHH!93iiSiJ3Hi 



m "wu"mnmmmmmmsi 



Mmmm 

 moimwM 



Ganoids. — Fig. 



^chmodus (Tetragonolepis) (X^), from the Lias; a, Scales of same ;804 r 

 Aspidorhyncus (X.%), from the Oolyte. 



Figs. 805-810. 



Eeptiles.— Tig. 805, Ichthyosaurus communis (x^-g- ); 806, Head of same (X3V); 807 a, b t 

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

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



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



