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HISTORICAL GEOLOGY 



Fig. 512. — Restoration of Stegosaurus. (After F. A. Lucas.) 



front of the jaw was sharp and parrot-like, and covered with horn, 

 while the rear of the jaw was provided with shearing teeth. One 

 genus of horned dinosaur (Torosaurus) had the largest head of any 

 land animal, the skull being nearly nine feet long. The body, 

 as well as the head, was protected, as is indicated by various 

 spines and plates found associated with the skeleton, which were 

 evidently embedded in the skin during life, doubtless for pro- 



FlG. 513. — Triceratops, an armored dinosaur. It was about twenty feet long. 

 (Restoration by C. R. Knight under the direction of Professor Osborn. Copyright, 

 American Museum of Natural History.) 



