Report of the Meeting of the British Association for the Advancement of Science Volume 9

Report of the Meeting of the British Association for the Advancement of Science Volume 9

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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. 1840 edition. Excerpt: ...ossicles on the radial margin of the paddle, which may be regarded as the rudiment of a fourth digit. The component phalangial ossicles are more rounded in their contour, and less transversely elongated, than in the previously described species: their margin is slightly raised on the outer surface. Beyond the antibrachium I count fourteen ossicles in each of the marginal, and fifteen in the median row, which, with the three supplementary ossicles, make forty-seven in the whole fore paddle or manus. The pelvic bones are characterized by their relative superiority of size, more especially the ilium. The femur, together with the other bones of the posterior member, is still longer in proportion than in the other species of Ichthyosaurus. It is only a very little less than the humerus: its proximal extremity presents a large depression, probably for the attachment of a stout ligament. The tibia presents the same anterior emargination as the cor responding bone of the fore extremity, and the same character occurs in the two succeeding ossicles forming the anterior margin of the paddle. part of the cnemial than of the tarsal series; this latter row of three bones being completed by the intercalation, in its middle, of an ossicle which forms part of the third or metatarsal row in the intermedius and communis. The character above noticed in the tenuirostris may be observed, in a slighter degree, in the Ich. platyodon. The middle bone of the first or tarsal row is distinguished by a wedge-like process at its upper margin, which fits into the interspace of the tibia and fibula. There are three principal digital series as in the fore paddle, but the supplementary row contains a greater number of ossicles, and is situated on the posterior instead of...
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Product details

  • Paperback | 164 pages
  • 189 x 246 x 9mm | 304g
  • United States
  • English
  • black & white illustrations
  • 1236835824
  • 9781236835826