. The origin and evolution of life, on the theory of action, reaction and interaction of energy. on. Camarasaiirus, a heavy-bodied, short-limbed quadrupedal type. Diplodocus, a light-bodied, relatively swift-moving quadrupedal type. Brachiosauriis, a short-bodiedquadrupedal type in which the fore limbs are more elevated than the hind attained gigantic size, being related to the recently discovered Giganlo-saiinis of East .Africa. Restorations by Osborn, Matthew, and Deckert. gigantic type Bracl/iosannts (- Gigantosaurics), with its greatlyelevated shoulder and forearm, mass
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. on. Camarasaiirus, a heavy-bodied, short-limbed quadrupedal type. Diplodocus, a light-bodied, relatively swift-moving quadrupedal type. Brachiosauriis, a short-bodiedquadrupedal type in which the fore limbs are more elevated than the hind attained gigantic size, being related to the recently discovered Giganlo-saiinis of East .Africa. Restorations by Osborn, Matthew, and Deckert. gigantic type Bracl/iosannts (- Gigantosaurics), with its greatlyelevated shoulder and forearm, massive quadrupedal types likeCamarasaurus Cope and Apatosaurus (=^ Brontosaurus) Marsh,and the relatively long, slender, swiftly moving to Lull and Deperet the Sauropoda survived untilthe close of the Cretaceous Epoch in Patagonia and in southernFrance. In North America they became extinct in LowerCretaceous time. 220 THE ORIGIN AND EVOLUTION OF LIFE In the final extinction of the herbivorous sauropod type wefind an example of the selection laiv of elimination^ attributable. Fig. 98. .\\iiiiiiiii i)R THEORY ()i. TiiK IlAliirS OF Apatosaurus. (Upper.) Apatosaurus { = Brontosaurus), a typical sauropod of Morrison age, quad-rupedal, heavy-limbed, herbivorous, inhabiting the flood-plains (Morrison) and lagoonsof the region now elevated into the Rocky Mountain chain of Wyoming and Colorado. (Lower.) Mounted skeleton of Apatosaurus { = Brontosaimis) in the American Museumof Natural History. to the fact that these types had reached a cul-de-sac of mechan-ical evolution from which they could not adaptively emerge HERBIVOROUS DINOSAURS 221 when they encountered in all parts of the world the new en-vironmental conditions of advancing Cretaceous time. The Iguanodontia Contemporaneous with the culminating period of the evo-lution of the Sauropoda is the world-wide appearance of an
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