228 VERTEBRATA: REPTILIA OR REPTILES. 



a total length of fifty feet, and its neck, with over sixty 

 vertebrae, was twenty-five feet long ! 



But, if possible, still more wonderful sea-saurians are 

 included in the genus Mosasaurus. These Sea-saurians, 

 unlike those previously mentioned, have the teeth in 

 sockets, and their body covered with bony plates. The 

 remains of more than forty species have been found in 

 the Cretaceous rocks of New Jersey, the Gulf States, and 

 Kansas. They were exceedingly snake-like in their appear- 

 ance, and some of them were at least seventy-five feet 

 long ! They were the " Sea-Serpents " of the old Creta- 

 ceous oceans. 



SUB-SECTION VII. 

 THE ORDER OF PTEROSAURIA OR FLYING SAURIANS. 



ALL the members of this order are also extinct. The 

 name Pterosaurus comes from the Greek pteron, a wing, 



FIG. 262. 



Pterodactyl. 



