844 



HISTORICAL GEOLOGY. 



nearly two feet. They appear to have been among the most formidable 

 of all Teleosts. Sauroceplialus lanciformis Harlan (Saurodon lanciformis 

 Hays, 1830), from the "Upper Missouri region," is one of the group. 



Eestoration, showing the probable form of Portheus, Cope. 



2. Reptiles. — The Reptiles included species of enormous size, yielding to 

 few if any of the Jurassic period. Besides long-necked Sea-Saurians, related to 



1408. 



Eestoration of Olaosaurus annectens (x^y. Marsh. 



the Plesiosaurs, and huge carnivorous and herbivorous Dinosaurs, related to 

 the older kinds, there were other Dinosaurs equally huge, having horns with 

 horn-cores, like cattle, but with a third horn on the nose ; Pterosaurs, 20 feet 



