THE AMERICAN MUSEUM OF NATURAL HISTORY 



At the eastern end of the hall are skeletons of smaller 

 dinosaurs and several fine skulls of horned dinosaurs, Cera- 

 topsia, from the Upper Cretaceous of Wyoming and 

 Alberta, the most interesting example being that of Tricera- 

 tops, seven feet in length, with its three large horns and 

 heavy bony frill extending back and over the neck. In 

 other sections will be seen a portion of a skeleton of Tyran- 

 nosaurus rex (king of tyrant saurians) and the remains of 

 an armored dinosaur, Ankylosaurus. 



Above the entrance to the Tower Room of the Southeast 

 Pavilion, are the reconstructed jaws of a huge fossil shark 

 in which the actual teeth are arranged as in the sharks of 

 to-day, in banks or rows. This is the largest and most for- 

 midable fish, living or extinct, of which there is any record. 

 The teeth were found in the phosphate beds of North Caro- 

 lina, and after the jaws of live species were carefully meas- 

 ured, the model was prepared according to scale. It is 

 known that a specimen, in which the largest tooth was one 

 and one half inches in height, measured twenty feet in 

 length, and that another, having teeth three inches in 

 height, had a total length of forty feet. It therefore follows 

 that the length of this Carolina shark, whose teeth meas- 

 ured six inches, was approximately eighty feet, comparing 

 with the largest modern whales in size. 



In cases at the right and left of the entrance are exhibits 

 illustrating the forms, structure and development of typical 

 recent fishes. 



The exhibits in the Tower Room comprise the remains of 



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