CRETACEOUS ANIMALS. 



485 



Dinosaurs, Pterosaurs, and Crocodilians, and also a new type, intro- 

 duced in the Cretaceous for the first time, the Mosasaurs, wholly ma- 

 rine in habits, but of long, slender, snake-like form, and attaining 

 extraordinary length. Turtles were also found in large numbers and 

 of great size. "We can mention only a very few of the most remarkable 

 of the Cretaceous reptiles. 



Fig. 811.— Teeth of Hadrosaurus (after Leidy): a, Pavement of Teeth; b and c, Tooth separated. 



Among Enaliosaurs the Iclithyosauridce are not found in America, 

 but the PlesiosauridcB were abundant, and attained much greater size 

 than in Europe. Leidy describes one, Discosaur (Elas- 

 mosaur, of Cope), which was fifty feet long, with a neck 

 of sixty vertebrae and twenty-two feet long. Among 

 Dinosaurs the Hadrosaur from Xew Jer- 

 sey was twenty-eight feet long ; and, judg- 

 ing from the huge size of its hind-legs and 

 massiveness of its hips and small size of its 

 fore-legs, it seems to have been able to 

 stand and walk in the manner of birds 

 (Fig. 813). This animal was a vegeta- 

 ble feeder, with teeth somewhat like 

 those of the Iguanodon, but set in sev- 

 eral rows, so as to form a kind of tes- 

 sellated pavement (Fig. 811). From 

 the same locality the Dryptosaur us 

 (Lcelaps), similar to the Megalo- 

 saur, and twenty-four feet long, 

 and the Omitliotarsus (bird- 

 ■ shank), thirty -five feet long, 

 stood twelve to fifteen feet high 

 when walking on their hind-legs. Among Pterosaurs, Marsh has found 

 in the "Western Cretaceous the remains of at least seven species, two of 



