. The testimony of the rocks; . 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.

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