The Moon, Theory and Tables

The Moon, Theory and Tables

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1834 edition. Excerpt: ...and hence, however abundant, would leave no permanent record in the deposits in which remains of fishes are usually preserved. It is safe to infer, from the knowledge which we now possess of the simpler forms of life, that even more of the early fishes were cartilaginous, or so destitute of hard parts as to leave no enduring traces of their existence. Without positive knowledge of such forms, and considering the great diversity of those we have, it would seem a hopeless task at present to attempt to trace successfully the genealogy of this class. One line, however, appears to be direct, from our modern Gar-pike, through the lower Eocene Lepidosteus to the Lepidotus of the Cretaceous, and perhaps on through the Triassic Ischypterus and Carboniferous PaZwom'scus; but beyond this, in our rocks, it is lost. The living Chimaera of our Pacific coast has nearly allied forms in the Tertiary and Cretaceous, more distant relatives in the Carboniferous, and a possible ancestor in the Devonian R/zynchoolus. Our Sharks likewise can be traced with some certainty back to the Palaeozoic; and even the Lepidosiren, of South America, although its immediate predecessors are unknown, has some peculiar characters which strongly point to a Devonian ancestry. These suggestive lines indicate a rich field for investigation in the ancient life-history of American fishes. The Amphibians, the next higher class of vertebrates, are so closely related to the fishes in structure, that some peculiar forms of the latter have been considered by anatomists as belonging to this group. The earliest evidence of Amphibian existence, on this continent, is in the Sub-Carboniferous, where foot-prints have been found which were probably made by Labyrinthodonts, the most more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236580052
  • 9781236580054