Palaeozoic Fossils Volume 1

Palaeozoic Fossils Volume 1

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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. 1865 edition. Excerpt: ...oblong-oval. Entire length three lines, and width at posterior margin of the head one and one-fifth line; front of head and posterior margin of tail, broadly rounded; sides parallel. "Head semi-circular, two-fifths of the entire length, strongly convex, posterior margin marked by a well-defined furrow, which curves round the lateral angles anteriorly. "Glabella ovate, narrow at the base, and broadly rounded in front, extending anteriorly beyond the fixed cheeks, prominently convex with a very narrow flat rim forming an arch round the front. "Thoracic segments six or seven, flat, lying close to each other, with a broad deep groove extending outwards to the tips, which are bent down. "Axis--tapering regularly from the front of the head to the posterior margin of the tail, convex, as wide as the pleurae in front and less posteriorly; the rings of the axis run into the grooves of the pleurae, marked by a deep grove. "Tail semi-circular, the lateral lobes marked by two or three ribs with a deep groove as in the pleurae, owing to which and the smallness of the specimen, it is difficult to perceive the line of separation between the body and the tail. "The eyes and free cheeks are absent in all specimens. "Affinities--in form and number of pleurae it resembles Cyphoniscus socialis (Salter), but differs from it in details of structure; the pleurae are of a different type, having the groove running along the middle, straight outwards, and not obliquely outwards and downwards, as in Salter's figure. The pygidium is entire, but it is as deep grooved as the pleurae, the whole form is not so convex, and the pleurae are not facetted. It appears from the outward edge of the fixed cheeks that the facial suture cuts the margin...show more

Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123661514X
  • 9781236615145