. The origin and evolution of life, on the theory of action, reaction and interaction of energy. Fig. 31. EuRYPTERiDS OR Sea-Scorpions of Silurian Times. A. Restoration of the giant eurypterid, Stylonurus excelsior, from the Catskill sandstone. Natural length, four feet. B. Restoration of , from the Bertie water-lime. Natural length, three feet. C. Restoration of Eiisarcus, age of the Bertie water-lime. (After John M. Clarke.) amphibious, terrestrial, and aerial Insecta were derived fromsome Silurian or Devonian chitin-armored articulate. Thetrue Crustacea also have probably developed
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. Fig. 31. EuRYPTERiDS OR Sea-Scorpions of Silurian Times. A. Restoration of the giant eurypterid, Stylonurus excelsior, from the Catskill sandstone. Natural length, four feet. B. Restoration of , from the Bertie water-lime. Natural length, three feet. C. Restoration of Eiisarcus, age of the Bertie water-lime. (After John M. Clarke.) amphibious, terrestrial, and aerial Insecta were derived fromsome Silurian or Devonian chitin-armored articulate. Thetrue Crustacea also have probably developed out of the same 134 THE ORIGIN AND EVOLUTION OF LIFE pre-Cambrian stock, giving rise to the phyllopods and othertrue Crustacea of the Cambrian, and to the cirripedes or bar-nacles of the Fig. America in Middle Devonian Times. Theoretic restoration of the North American continent (white), continental seas (gray),and ocean (dark gray), in Middle Devonian (Hamilton) time. This period ismarked by the last extensive inundation of the Arctic seas, by the rise of the Schick-chockian Mountains and many volcanoes in Acadia, and by the beginning of thegreat Catskill delta built up by rivers from the rising Acadian region. Marine sharkand arthrodires become abundant, the American fauna of the Mississippi Sea showsnumerous brachiopods and bivalves, and the first evidence of a land flora with largeconifers (Dadoxylon) is found. Detail from a globe model in the American Museumby Chester A. Reeds and George Robertson, after Schuchert. Reactions to Climatic and Other EnvironmentalChanges of Geologic Time Schuchert observes that there is no more significant periodin the history of the world than the Devonian^ (Fig. 32), forat this time the increasing verdure of the land invited the ^P
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