Figures and Descriptions Illustrative of British Organic Remains; Monograph[s]. Volume 1-2

Figures and Descriptions Illustrative of British Organic Remains; Monograph[s]. Volume 1-2

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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. 1859 edition. Excerpt: ...9; mandibles with palpi, figs. 5, 6, 7; antennae, fig. 10; and to these must be added certain figures in Plate XII., showing the antennae, figs. 1, 2; the post-oral plate, fig. 3; the bilobed (abdominal?) appendages, figs. 4, 5; and possibly the portion of the swimming foot, fig. 6; together with the imperfect caudal joint in Plate IX. fig. 18. The two last may, however belong to P. gigas, a species very nearly allied, and to which for some time I believed the whole of the specimens referable. Again, there is so much resemblance in certain points to the Scotch species, P. anglicus, that it requires nice discrimination to separate the three forms. The characters of the antennae, and also of the caudal joint, will, I think, be sufiicient. And if subsequent observation should tend to show that this "Tilestone" species is the opposite sex of the P. gigas, it will still have been worth while provisionally to separate them. Body Joints.--The complete specimen, Plate XIV. fig. 1, shows that the body was not greatly elongated, the segments being all rather widely transverse, the seventh, for instance, being fully four and a half times as wide as long; the eighth and ninth are gradually narrower, but the tenth still shows a width two and a half times greater than the length, while in P. anglicus the corresponding joint appears so have been no more than one and a half times the length (see Plate V. fig. 1). The penultimate joint is squareish, or rather inversely conical, not much expanded below. It is about one-fourth wider than long (as in P. anglicus), and this at the hinder part only. A strong central keel runs down its whole length, covered with large squamae, and the margins are similarly ornamented. If the caudal joint, Plate IX....
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Product details

  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • United States
  • English
  • black & white illustrations
  • 1236751183
  • 9781236751188