THE COLLECTION OF FOSSIL VERTEBRATES 29 
preserved. In Case 4 are limbs and other parts of several species 
of Amphibious Dinosaurs. 
The Beakep Dinosaurs (Predentata) northeast corner of 
the hall, had a horny beak or bill at the front of the jaw, and 
teeth at the back of it. They were most extraordinary Beaked 
and bizarre animals, huge in size, although not so Dinosaurs, 
large as the Amphibious Dinosaurs. Stegosaurus ee ce 
: ee riceratops 
a series of great bony plates projecting from the back, and Had- 
and stout bony spines on the tail. Triceratops had an _ rosaurus, 
enormous skull with three great horns projecting forward, and a 
strong bony frill projecting backward around the neck. Both 
these were quadrupedal animals with massive limbs and elephan- 
tine feet. Hadrosaurus was a bipedal dinosaur with long hind 
limbs and three-toed bird-like feet, but with hoofs instead of 
claws. Its beak was broad and flattened, as in the spoon-bill 
duck or Ornithorhynchus of Australia. 
The Carnivorous Dinosaurs are exhibited on the east side 
of the hall (opposite the entrance). They were bipeds with bird- 
like feet, sharp claws and large heads with sharp-  Carnivor- 
pointed teeth. Some of these, the Megalosaurs, were ous 
of gigantic size, much larger than any modern car- Dinosaurs. 
nivore. Allosaurus was as large as an elephant, while other 
Megalosaurs were even larger. Other Carnivorous Dinosaurs, 
such as Orietholestes, were small and of slender proportions; 
these probably lived on the small animals of that period—toothed 
birds, pterodactyls, small reptiles of various kinds—while the 
large herbivorous dinosaurians were more probably the chief 
prey of the Megalosaur. 
All the Dinosaurs had become extinct by the end of the Age 
of Reptiles. Their place was taken by the more intelligent 
and adaptable mammals, the evolution of which into the differ- 
ent kinds of modern quadrupeds has been seen in the Other Rep- 
Hall of Fossil Mammals. tiles— 
On the south side of the Fossil Reptile Hall are STocodles: 
fossil remains of four other groups of reptiles, the Siecotnc 
CrocopiLes, TurTLES, Lizarps and SNAKEs, which, tyls etc. 
more fortunate than the dinosaurs, have survived to the present 
day, though in much diminished numbers and importance. 
