. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palaeontological science. Paleontology. Fig, 97.—Atrypa reticidaris. Upper Silurian and Devonian of Europe and America. (After Billings.) The Bivalves {Lamellibranchiafa) of the Devonian call for no special comment, the genera Fkrhiea and Alegalodoii being,. Fig. 98.—StropJwinena rJwniboidalis. 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 t
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palaeontological science. Paleontology. Fig, 97.—Atrypa reticidaris. Upper Silurian and Devonian of Europe and America. (After Billings.) The Bivalves {Lamellibranchiafa) of the Devonian call for no special comment, the genera Fkrhiea and Alegalodoii being,. Fig. 98.—StropJwinena rJwniboidalis. 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 Platyceras (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 Eiiomphahis, with its discoidal spiral shell. Amongst the Heteropods, the sur^'ival of Bellej'opho7i is to be recorded; and in the '' Winged-snails," or Pteropods^ we find new forms of the old orenera Tentacidites and CoJiularia. 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. New York, A. L. Fowle
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Keywords: ., bookcentur, bookdecade1870, booksubjectpaleontology, bookyear1876
