. The origin and evolution of life, on the theory of action, reaction and interaction of energy. irus, the crested duck-bill dinosaur. Restorations by Brown and Deckert. (Lower.) Mounted skeleton of Corythosaurus in the American Museum of Natural His-tory, recently discovered in the Upper Cretaceous of Alberta, Canada, with the integ-ument impressions and body lines preserved. anatomy and habits of all these forms have been made knownrecently by American Museum explorations in Alberta, Canada,under Barnum Brown (Fig. loi). The partly armored dinosaurs known as stegosaurs arerelated to the igua
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. irus, the crested duck-bill dinosaur. Restorations by Brown and Deckert. (Lower.) Mounted skeleton of Corythosaurus in the American Museum of Natural His-tory, recently discovered in the Upper Cretaceous of Alberta, Canada, with the integ-ument impressions and body lines preserved. anatomy and habits of all these forms have been made knownrecently by American Museum explorations in Alberta, Canada,under Barnum Brown (Fig. loi). The partly armored dinosaurs known as stegosaurs arerelated to the iguanodonts and belong to the bird-pelvis group 224 THE ORIGIN AND EVOLUTION OF LIFE (Ornithischia). The small Triassic ancestors of this greatgroup of herbivorous, ornithischian dinosaurs also gave riseto a number of secondarily quadrupedal, slow-moving forms,in which there developed various forms of defensive and offen-sive armature. Of these the Jurassic stegosaurs exhibit areversed evolution in their locomotion since they pass from abipedal into a quadrupedal type in which the armature takes. Fig. I02. Offensive and Defenshe Energy Complexes. The carnivorous tyrant dinosaur Tyrannosaiirus approaching a group of the hornedherbivorous dinosaurs known as Ceratopsia. Compare frontispiece. The Ceratopsia are related to the armored Stegosaurus and to the armorless, swift-movingIguanodontia. Restoration by Osborn in the American Museum of Natural History,painted by Charles R. Knight. the form of sharp dorsal plates and spiny defenses, the exactarrangement of which has been recently worked out by Gil-more. Doubtless when this animal was attacked it drew itshead and limbs under its body, like the armadillo or porcu-pine, and relied for protection upon its dorsal armature, aidedby rapid lateral motions of the great spines of the tail to wardoff its enemies. During the progress of Cretaceous time thesestegosaurs became extinct, and by the beginning of the MiddleCretaceous two other herbiv
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