

FOSSIL REPTILES 
the last and most powerful of the carnivorous dinosaurs. Like Allosaurus it 
has enermous three-toed hind legs armed with sharp claws, 
Tyranno- 
ei and smaller fore legs. Tyrannosaurus is from Montana and 
the matrix in which it was found is as hard as flint. 
To the left of Brontosaurus are two complete specimens of the duck- 
billed dinesaur T'rachodon. One shows the animal erect 
Trachodon ; : ; ome 
and standing on guard, while the other is shown feeding on 
shellfish and plants of the Cretaceous swamps of Montana. 
In the low ease in front of this group is one of the most interesting reptile 
specimens which has ever been discovered. It is a mummified duck- 
billed dinosaur, Trachodon, the skin of which is wonderfully well preserved, 
and for the first time the character of the outer covering of this animal is 
fully revealed. 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. 
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; Dzadectes, a reptile 
with a solid-boned skull and Eryops, a primitive amphibian. The finest 
collection of fossil turtles in the world will be found on the south side 
of the hall. 

Model of Naosaurus or ‘‘Ship-Lizard,’’ an ancient and grotesque reptile. Collected 
in Texas; length eight feet 
