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THE POPULAR SCIENCE MONTHLY. 



Who were these assailants ? Probably also dinosaurs belong- 

 ing to the carnivorous branch of this order. One of the best 

 known of them is the megalosaurus, an animal of about the same 

 size and way of living as the iguanodon, marching or wading 

 mostly on its hind-legs. A carnivorous animal is characterized 



Fig. 4.— Teeth of Iguanodon. 



by its teeth, which must be apt to seize and lacerate its prey. 

 The teeth of megalosaurus were few in number, large, flattened, 

 of the shape of a saber, and with sharp, crenulated edges. Mega- 

 losaurus was a European dinosaur. One of the best-known^ 

 American carnivorous dinosaurs of the Jurassic formation has 

 been called ceratosaurus, on account of a large horn on the skull. 



Head of Megalosaurus, one tenth natural size (restored by Phillips). 



If the reptiles mentioned heretofore, with a length of twenty- 

 five to thirty feet, must be called beasts of quite a respectable size, 

 they were by no means the giants of their order. The largest 

 known dinosaurs have been found in the Jurassic formation of 

 the western slope of the Rocky Mountains, in Colorado and Wy- 

 oming. In the A Museum of Yale College, in New Haven, there are 



