The Footprints of the Creator; Or, the Asterolepis of Stromness

The Footprints of the Creator; Or, the Asterolepis of Stromness

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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. 189? edition. Excerpt: ...the hunter and the racehorse. And with the heterocercal tail, so true in its homologies to the tails of the higher vertebrata, we find associated, as has been shown, the true homological position of the fore limbs. With the commencement of the Old Red Sandstone the ganoidal tail first presents itself; and we become sensible of a change in the structure of the attached fin, similar to that exemplified in the caudal rays of the sturgeon. As shown by ihe irregularly-angular patch of scales which in all the true Coelacanths, and almost all the Diptenans, runs through the The vertebral column in the genus Diplopterus ran, as in the placoid genus Scyllium, nearly through the middle of the caudal fin. upper lobe of the fin, and terminates in a point, (see fig. 50, ) it must have oossessed the gradually diminishing venebrus, or a diminishing spinal cord, their analogue; but the rays, fairly set, as their state of keeping in the rocks certify, exist as narrow oblong plates of solid bone; and their anterior edges are strengthened by a line of osseous defences, that pass from scales into rays. And in harmonious accompaniment with this fairly stereotyped edition of the ichthyic tail, we find, in the fishes in which it appears, the first instance of displacement of limb, --the bases of the pectorals being removed from their original position, and stuck on to the nape of the neck. It may be remarked, in passing, that in the tails of two ganoidal genera of this period, --the Coccosteus and Pterichthys, --the analogies traceable lie rather in the direction of the tails of the Rays than in those of the Sharks; and that one of these, the Coccosteus, seems, as has been already intimated, to have hod no pectorals, while it is doubtful whether in the Pterichthi, ? tshow more

Product details

  • Paperback | 84 pages
  • 189 x 246 x 4mm | 168g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236680839
  • 9781236680839