LOS MUMMIED DINOSAUR 
To the left of Brontosaurus are two complete specimens ofthe duck- 
billed dinosaur T’rachodon. One shows the animal erect 
and standing on guard, while the other is shown feeding on 
shellfish and plants of the Cretaceous swamps of Montana. 
Most wonderful perhaps of all the specimens shown here is a 
“mummy” of Trachodon in which the texture of the 
skin is preserved. The animal is lying on its back and, 
in spite of its crushed condition, its form is easily 
distinguishable. It probably died on a sand bank or near a shoal 
where the hot winds dried up the flesh until the skin adhered to the 
bones like a close-fitting glove, and was subsequently buried by a flood. 
[See Handbook, No. 5, Dinosaurs.] 
Trachodon 
Mummied 
Dinosaur 
RESTORATION OF NAOSAURUS 
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Other specimens shown in the hall include the smaller carnivorous 
dinosaurs, the horned dinosaurs with, in one instance at least, a skull 
seven feet in length, and giant birds possessed of teeth. There is also the 
finback lizard, one of the most ancient of fossil reptiles; Diadectes, a 
reptile with a solid-boned skull and EHryops, a primitive amphibian. The 
finest collection of fossil turtles in the world will be found on the south 
side of the hall. 
In the Tower of the Southeast Pavilion are displayed the fossil fishes 
which belong to a much earlier period than the mammals 
and reptiles, some of them having lived twenty to fifty 
millions of years ago. Many of these forerunners of backboned 
animals are quite unlike any living fishes and are probably only 
Fossil Fishes 
