DINOSAURS 169 



has a large muzzle, the surface of which is considerably 

 roughened, showing that it was covered, during life, with hard and 

 thickened skin. The brain of the creature was very small in pro- 

 portion to its skull. The orbits for the eyes are large, suggesting 

 large eyes ; and its sense of smell was probably pretty keen. The 

 teeth resemble those of Hadrosaurus, an allied form. Succulent 

 vegetation probably was the main diet of this animal. The whole 

 backbone, or vertebral column, was found complete, with the 



FIG. 58. Skeleton of a large herbivorous Dinosaur, Claosaurus annecteiis, from 

 Cretaceous strata, North America. (After Marsh.) 



exception of a few little vertebrae from the end of the tail. Alto- 

 gether there were about ninety vertebrae in the backbone of this 

 powerful creature. The reader will perceive, from the drawing of 

 the skeleton, in Fig. 58, that this Dinosaur must have possessed 

 a long and powerful tail, such as would have constituted a most 

 useful organ of propulsion through the water. As in its ally, 

 Iguanodon, the vertebras of the tail are compressed in a vertical 



