. The testimony of the rocks; . ASAPHUS CAUDATDS. i Silurian.) ORTHOCERAS SPIRIGERINA RETICULARIS. LATERALE. (Mountain Limestone.) (Old Red Sandstone.) and Tertiary, — the first, or ichthyic period, is markedchiefly, not by its great fishes, but by the peculiar character Fig. 80. Fig. 81. Fig, 82. Fig. 83. mu. A. MARGARITATUS. BISULCATtrS. belem:^itella belemnitesmucroaata. sulcatds. (Lias.) (Lias.) (Chalk.) (Oolite.) of its brachipodous and cephalopodous mollusca, and in itsearlier stages by its three-lobed crustaceae; the second or HISTORY OF ANIMALS. 135 reptilian period was emphatically th
. The testimony of the rocks; . ASAPHUS CAUDATDS. i Silurian.) ORTHOCERAS SPIRIGERINA RETICULARIS. LATERALE. (Mountain Limestone.) (Old Red Sandstone.) and Tertiary, — the first, or ichthyic period, is markedchiefly, not by its great fishes, but by the peculiar character Fig. 80. Fig. 81. Fig, 82. Fig. 83. mu. A. MARGARITATUS. BISULCATtrS. belem:^itella belemnitesmucroaata. sulcatds. (Lias.) (Lias.) (Chalk.) (Oolite.) of its brachipodous and cephalopodous mollusca, and in itsearlier stages by its three-lobed crustaceae; the second or HISTORY OF ANIMALS. 135 reptilian period was emphatically the period of the ammo-nite and belemnite ; while the third and last, or mammalianperiod, was that of gastropodoiis and conchiferous molluscs,impressed, generically at least, by all the featm-es of the Fig. 84. Fig. 85.
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