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A Synopsis of the Characters of the Carboniferous Limestone Fossils of Ireland

A Synopsis of the Characters of the Carboniferous Limestone Fossils of Ireland


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844 edition. Excerpt: ... form two large, irregular, oval cicatrices in the ventral valve, situated one on each side, about midway between the central septum and the lateral margin of the shell, and about their own length distant from the anterior margin ( see fig. 9, the ventral valve of the Producta pustulosa, B B); EE (fig. 9) shews the origin of the second pair of adductor muscles, forming small, pear-shaped cicatrices, close to the central septum, the lower, dilated portion curving outwards. The ventral valve is connected to the dorsal, by a kind of cardinal tooth, usually notched (see fig. 10, B), similar to that of Thecidea. There is in Fig. 9. the centre of the ventral valve of all the species, a long, prominent, shelly, septum f ft arising from the cardinal tooth, and extending to within a short distance of the anterior margin; it increases in prominence towards its anterior end, where it is abruptly truncated or rounded according to the species; it is in some measure analogous to the central septum, in the dorsal valve of the Spirifers. The beautiful markings, represented fig. a A, may be viewed as a modification of the spiral appendages of Spirifer; they are in fact the support for the arms of the animal, but instead of their extremities being free, and projecting into the cavity of the shell, as in Terebratula or Spirifer, it is fixed along its whole length to the surface of the ventral valve, as we see in Thecidea and Crania; the reason of this difference appears to be that Spirifer and Terebratula, having convex ventral valves, and being attached so as to hang by the beak, their arms are so placed, that the bases of the cones which they form, when retracted, become parallel, and their extremities, when unrolled, extend in the direction of the...


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Product Details
  • ISBN-13: 9781230858210
  • Publisher: Theclassics.Us
  • Publisher Imprint: Theclassics.Us
  • Height: 246 mm
  • No of Pages: 116
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1230858210
  • Publisher Date: 12 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 222 gr

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