JURASSIC PERIOD. 



445 



toed, like those of other Dinosaurs, with strong compressed claw- 

 bones. The sacrum corresponded, as in Mammals, to five united 



Fig. 814. 



Megalosaurus Bucklandi (X^-g-) as restored by Phillips. 



vertebrae. This Reptilian Carnivore was of very high grade in its 

 class, higher than the huger Cetiosaur ; it compared in size with the 

 Cetiosaur, nearly as the highest Mammalian 

 Carnivores with the Elephantine Herbivores. 



The Iguanodon of Mantell was an herbivor- 

 ous Dinosaur of the Wealden. It was thirty 

 feet long, and of great bulk, and had the habit 

 of a Hippopotamus. The femur, or thigh- 

 bone, in a large individual, was about thirty- 

 three inches long, and the humerus, nineteen 

 inches. The teeth (Fig. 814) were flat, and 

 had a serrated cutting edge like the teeth of 

 the Iguana ; and hence the name, signifying 

 Iguana-like teeth : many of them, from old 

 animals, are worn off" short. This species 

 occurs also in the Cretaceous. 



The Hylceosaur, another Tilgate Forest Di- 

 nosaur, had its skin covered with circular or 

 elliptical plates, and was twenty to twenty-two 

 feet long. 



The Coprolites (fossil excrements) of the Saurians are not uncom- 

 mon ; one is represented in Fig. 816. They are sometimes silicified, 

 and, notwithstanding their origin, are beautiful objects, when sliced 

 and polished. 



Tooth of Iguanodon Mantelli. 



