MESOZOIC ERA. AGE OF REPTILES. 



327 



family is here represented by Ceratites. They are easily 

 recognized, and entirely characteristic of the Triassic. The 

 complexity of the suture is increased, as shown in Fig. 258. 



PIG. 259. Teeth of Triassic 

 fishes ; Hybodus apicalis, (Af- 

 ter Agassiz.) 



FIG. 260. Mastodonsaurus Jaegeri ; 



Among fishes we find still only Ganoids and Placoids, 

 but the Ganoids are assuming more and more the form of 

 ordinary fishes (Teleosts), and the teeth of the Placoids 

 are becoming more shark-like (Fig. 259). 



FIG. 201. Triassic reptiles (after Owen) anomodouts and therodonts ; Dicynodon 



lacerticeps. 



