46 Department of Vertebrate Palceontology. 



17. Hadrosaurus, Duck-billed Cretaceous Dinosaur. 



Drawn from the unusually complete skeleton of Hadro- 

 saurus (Diclonius) mirabilis Leidy, in the Cope Collection now 

 in the American Museum. This very specialized genus is 

 found in the Upper Cretaceous of New Jersey and Wyoming. 

 It was herbivorous, and probabh'' amphibious, \yith long neck 

 and heavy hind quarters. It had a broad, duck-like, horny 

 bill, and back of it a magazine of numerous small, rod-like 

 teeth, not less than a thousand in each jaw, set on end in 

 several close-set rows, and wearing to a tesselated-pavement- 

 like grinding surface. The length was about thirty feet. 



The skeleton of a nearly related genus, Claosaurus, is 

 mounted in the Yale Museum. 



Cope, Proc. Acad. Nat. Sci. Phila., 1883, p. 97; Amer. Nat., 1883, p. 

 774- 



18. Siberian Mammoth or Hairy Elephant. 



. Unlike the living elephants, the Mammoth ranged into arctic 

 countries, and is here restored with its appropriate environ- 

 ment, taken from the region of the Taku Glacier, Alaska. It 

 was a contemporary of primitive man, and its enormous size is 

 therefore fitly indicated by the contrast with human figures 

 in the background. In this instance the color and texture of 

 the hide is certainly known, from the mammoth carcasses 

 which have been found frozen in the palaeocrystic ice of 

 northern Siberia, and parts of which are still preserved in the 

 St. Petersburg Museum. 



19. Cervalces, Pleistocene American Elk. 



Cervalces was as large as the Moose, but is distinguished by 

 its magnificent antlers, spreading in three directions, outward, 

 upward, and forward, and attaining a size and complexity 

 unequalled by an}^ living species. Thg fine skeleton in the 

 Princeton Museum served as a basis for this restoration, the 

 superficial characters being studied from the Moose. 

 Scott, Proc. Acad. Nat. Sci. Phila., 1885, p. 191. 



