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 aimcctens, 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 vertebrae of the tail are compressed in a vertical 
