39 
Of the flesh-eating reptiles, a notable example among 
the Deinosaurs is Tyrannosaurus rex , a huge carnivorous 
reptile found in the Cretaceous beds of Montana. U.S.A. 
A fine cast of the skull is here exhibited, of which the original 
is in the American Museum of Natural History. The 
complete skeleton of this beast measures over 44 feet in length. 
Fig. 41. A Carnivorous Deinosaur, Cast of Head of — 
Tyrannosaurus rex. Cretaceous. 
Montana, U.S.A. 
Exch. U.S. Nat. Mus. 
Some of the herbivorous reptiles of the Jurassic seas were 
egg-laying (oviparous) and a fine series of their fossilized eggs 
were obtained by an expedition from the American Museum 
of Natural History in Mongolia. A cast of one of these eggs 
is shown in this Gallery. On the other hand, the Ichthyo- 
saurians or Fish-lizards are known to be viviparous. 
Other casts on the wall of the South Gallery are an Upper 
Jurassic Turtle (Pleurosternum) ; a great Ganoid Fish 
(Lepidotus maximus ) ; a “ Fringe-finned ” Ganoid of the 
