The American Museum Journal 

VoL, X JANUARY, 1910 Nox 
THE TYRANNOSAURUS 
N the southeast corner of the Dinosaur Hail are the remains of the 
largest beast of prey that ever lived. This is the Tyrannosaurus, 
the great Carnivorous Dinosaur of the Cretaceous Period. Forty 
feet in length, with huge and massive skuil, the jaws four feet jong armed 
with sharply pointed teeth each projecting from two to six inches from 
the socket, this monster is beyond comparison the greatest carnivorous 
animal that ever inhabited the land. 
The Museum has been peculiarly fortunate in securing three skeletons 
of this rare dinosaur. All of them were found by Mr. Barnum Brown 
of the Department of Vertebrate Paleontology on different expeditions. 
The first, from near Edgemont, South Dakota, was discovered in 1900 
and includes the lower jaws, many vertebree and ribs and a few bones 
from the limbs and feet. ‘The second was obtained in 1902 on Hell 
Creek in central Montana and consists of a large part of the skull and 
jaws, most of the vertebrae of the back and the nearly complete pelvis 
and hind limbs. Since then Mr. Brown has searched diligently for 
additional remains of this animal, and in 1908S he was so fortunate as to 
find a skeleton in splendid preservation, and perfect except that it lacked 
the iimbs and the tip of the tail. he rock in which these skeletons were 
found is a loosely cemented sandstone, but the skeletons themselves are 
partly or wholly encased in great concretionary masses of flinty hardness. 
{xtracting the bones uninjured from these iron-hard concretions is a slow 
and difficult task and is not yet complete on the third and finest of the 
skeletons. 
The skull and jaws and the pelvis and hind limbs of the second 
skeleton have been restored and mounted in the hall, as previously 
noticed in the JournaL. The skull and jaws of the third and finest 
skeleton of the T'yrannosaur have recentiy been placed in a case beside 
them. This specimen, which is the first really complete skull of a 
carnivorous dinosaur known to science, is of inestimable scientific value. 
It is beyond question the most impressive dinosaur skull ever found and 
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