The World of Life; a Manifestation of Creative Power, Directive Mind And Ultimate Purpose
The World of Life; a Manifestation of Creative Power, Directive Mind And Ultimate Purpose
Wallace, Alfred Russel, 1823-1913
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96. — Conocoryphe auUaeri, Fio. 97. — Paradoxidea hohemio^B, Upper Cambrian. Upper Cambrian. Digitized by VjOOQIC 288 THE WORLD OF LIFE stages ^^ developed strange knobs and spikes on their shells, so that they seemed to be trying experiments in excessive vari- ation." Figs. 96, 97 show typical forms of Trilobites (so called fronf their three-lobed bodies) ; while at a later period, when the whole group was approaching extinction, it produced spined forms like that shown in Fig. 98. Excentric f...orms of Ammonites At a later period the wonderfully rich and varied Am- monites show still more curious changes. Beginning in the Devonian formation they increased in variety of form and structure all through the succeeding forma- tions, till they finally died ont in the Cretaceous. The two species here figured from the Trias (Figs. 99, 100) may be taken as typical; but the variations in surface pat- tern are almost infinita Visitors to Weymouth or Lyme Regis may find such in abundance under Lias cliffs, or in the former place along the shores of the backwater.
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