Memoirs of the Geological Survey of Great Britain, and the Museum of Practical Geology in London Volume 9; V. 11

Memoirs of the Geological Survey of Great Britain, and the Museum of Practical Geology in London Volume 9; V. 11

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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. 1864 edition. Excerpt: ...glabella furrows on either side are represented by shallow pits, arranged nearly in a square, and occupying the posterior third of the glabella; the anterior pair of furrows by similar depressions more remote, placed near the anterior and outer angles of the middle third. Two longitudinal grooves connect the posterior glabellar depressions with the neck furrow, only shown in our upper figure. The tergal portion of the neck segment is small and convex. The fixed cheeks are large, slightly arched, coalescing before the glabella in a narrow ridge, bordered by a still narrower margin. The lateral portion of the occipital groove passes forwards and outwards two-thirds across the fixed cheek, then slightly backwards to the lateral margin, cutting off nearly one-third of the cheek. The portion of the cheek before the groove is smooth like the glabella, the portion behind it (the neck segment) is marked with delicate strife parallel to the furrow and to the posterior margin. In all our examples the free cheeks and the eyes are absent, but from the portions which we possess, and from the analogy of closely allied forms, we may safely supply a facial suture coinciding with the outer edge of the anterior margin, appearing upon the upper surface nearly midway between the centre of the frontal edge and the genal angle, passing gently inwards, and then outwards and backwards through the limb, slightly emarginating the semicircular contour of the head, and so curving downwards and outwards towards the genal angle. The linear free cheek, bearing probably a linear eye, is absent. In our specimens the posterior angles have an imperfect truncated look, and we should be inclined to believe that, following the analogy of Trinucleus, IHonide, Cyphoniscus, ..show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236750756
  • 9781236750754