THE PRE-ADAMITE EARTH. 



epoch. Among the remains of this period are eleven genera of 

 saurian reptiles, of most singular forms, among which are in- 

 cluded the Labyrinthodon, the restoration of which by Professor 

 Owen is given in fig. 109. 



312. Chelonian reptiles (tortoises) now appeared for the first 

 time, together with six new genera of Ganoid fishes. Crustaceous 

 decapods, as well as acatabuliferous cephalopods (fig. 149), also 



Fig. 149. Ceratitcs uodosus (Fossil). 



appeared for the first time, besides numerous lamellibranchia 

 and echinoderms. 



The Chelonians of this period are only known by the traces of 

 their footsteps, which remain upon the rocks, figs. 108, 150. 



Fig. 150. Foot-print of the Chirotherium, a chelouian, or tortoise. 



313. Numerous birds probably existed in this period; but, like 

 62 



