. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. Fig. 97.—Atrypa ^-eticiilaris. Upper Silurian and Devonian of Europe and America. (After Billings.) The Bivalves {LamellibrcvicJiiatd) of the Devonian call for no special comment, the genera Pterinea and Megalodon being,. -StivJ^Jiontcua rhonihoidalis. Lower Silurian, Upper Silurian, and Devonian of Europe and America. perhaps, the most noticeable. The Univalves {Gasteropods), also, need not be discussed in detail, though many interesting forms of this
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. Fig. 97.—Atrypa ^-eticiilaris. Upper Silurian and Devonian of Europe and America. (After Billings.) The Bivalves {LamellibrcvicJiiatd) of the Devonian call for no special comment, the genera Pterinea and Megalodon being,. -StivJ^Jiontcua rhonihoidalis. Lower Silurian, Upper Silurian, and Devonian of Europe and America. perhaps, the most noticeable. The Univalves {Gasteropods), also, need not be discussed in detail, though many interesting forms of this group are known. The type most abundantly represented, especially in America, is Flatyceras (fig. 99), comprising thin, wide - mouthed shells, probably most nearly allied to the existing "Bonnet-limpets," and sometimes attaining very considerable dimen- sions. We may also note the continuance of the genus £uoni-f>Jiahis, with its discoidal spiral shell. Amongst the Hderopods, the survival of BcUerophon is to be recorded ; and in the " Winged-snails," or Ptcropods, we fmd new forms of the old genera Tcntaculiies and Coni/hiria. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nicholson, Henry Alleyne, 1844-1899. Edinburgh, London, Blackwood
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Keywords: ., bookaut, bookcentury1800, bookdecade1870, booksubjectpaleontology
