From this ancestral type the Dinosaurs evolved into a great variety of different kinds, many of them of gigantic size, some herbivorous, some carnivorous; some bipedal, others quadrupedal; many of them protected by various kinds of bony armor-plates, or provided with horns or spines; some with sharp claws, others with blunted claws or hoofs.
Fig. 6.—Outline Restorations of Dinosaurs. Scale about nineteen feet to the inch.
These various kinds of Dinosaurs are customarily grouped as follows:
[27]I. Carnivorous Dinosaurs or Theropoda. With sharp pointed teeth, sharp claws; bipedal, with bird-like hind feet, generally three-toed;[3] the fore-limbs adapted for grasping or tearing, but not for support of the body. The head is large, neck of moderate length, body unarmored. The principal Dinosaurs of this group in America are
Allosaurus, Ornitholestes—Upper Jurassic period.
[28]Tyrannosaurus, Deinodon, Albertosaurus, Ornithomimus—Upper Cretacic period.
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