Life On the Earth Microform Its Origin And Succession
Life On the Earth Microform Its Origin And Succession
John Phillips
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41 245+ 225 511 Zoophyta 27 103 379+ 509 Crustacea 15 65 218+ 298 The sign + is placed to the maximum number in each class, shewing that the maximum is attained in the Caenozoic Period, by Gasteropoda. Mesozoic Period, by Dimyaria, Cephalopoda, Monomyaria, Echinodermata. Palaeozoic Period, by Brachiopoda, Zoophyta, Crustacea. These results afford but slight encouragement to the speculation of the inferiority of the earlier and superiority of the later systems, and of continual progress upward i...n the organization of animals. In proportion to the elapsed time the changes make progress, but these changes are not always in the sense of uninterrupted advance from inferior to superior forms. G2 84 LIFE ON THE EARTH. For example, Cephalopoda, by universal consent, stand at the head of the Molluscous kingdom of animals; but their origin is of the same date as that of the Mollusca generally : they rapidly rise to importance, but pass the maximum in the Mesozoic period, and are now but a small and scattered part of the inhabitants of the sea, enormously outnumbered by the inferior races of Gasteropoda and Dimyaria.
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