THE PRE-ADAMITE EAETH. 

 Plesiosauri, fig. 155, whose oar-like feet resembled those of the 



Fig. 155. The Plesiosaums. 



present sea-tortoise. These animals replaced the sauroid fishes 

 of the Devonian period which long before had disappeared. It 

 was also this age which was signalised by those flying saurians 

 to which palaeontologists have given the name Pterodactyles (fig. 

 156), or wing-fingered. All these monstrous tribes became corn- 



Fig. 156. The Pterodactyle 



pletely extinct at the close of the Jurassic age. Tn fig. 161 (p. 1) 

 we have reproduced, after Dr. Buckland, an illustration of the 

 zoology and botany of this age. 



338. The producti had altogether, and the spirifers nearly, dis- 

 appeared, but numerous terebratulse of other species took their 

 places. The family of ammonites (fig. 8) which had commenced 

 to appear sparingly in the Triassic age now abounded. 



This age was also signalised by the appearance for the first 

 76 



