The Medals of Creation, Or, First Lessons in Geology, and in the Study of Organic Remains

The Medals of Creation, Or, First Lessons in Geology, and in the Study of Organic Remains

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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. 1844 edition. Excerpt: ... a chevron-bone that is anchylosed to the body of, the vertebra, and terminates in an inferior spine ( the pair of anterior oblique proccsses remains; the spinous process is destroyed. CETIOSAURUS. From a considerable number of vertebrae and bones of the extremities of some gigantic aquatic reptiles, discovered in the Oolite in various places in Oxfordshire, Northamptonshire, and Yorkshire, Professor Owen established the present genus; the name indicating the general Brit. Rep. 1841, p. 92. resemblance of these extinct Saurians to the Cetaceans. The vertebrae differ from those of the Iguanodon, which they somewhat resemble, but far surpass in magnitude, in having their articular faces of a sub-circular form, and the body relatively short; the anterior face is nearly flat, and the posterior concave, in the dorsal vertebrae; but in the caudal, both faces are concave, and have a well-defined elevated margin, which gives the body a deeply excavated character, easily recognisable. Vertebrae of this reptile occur in Tilgate Forest, and were among my earliest discoveries. (Geol. S. E. p. 282.)1' Some specimens are eight inches in the transverse diameter of the articular face, and but four and a half inches in the antero-posterior length of the body.1 The original animals are supposed to have been of aquatic, and probably of marine habits, on the evidence of the sub-biconcave structure of the vertebrae and of the coarse cancellous tissue of the long bones, which are destitute of a ' Proc. Geol. Soc. Vol. III. p. 457. 1-There are, in the British Museum, four consecutive caudal vertebrae, in the most perfect state, with a chevronbone detached. These bones were originally imbedded in a block of Tilgate-grit, and in a position so unfavourable more

Product details

  • Paperback | 118 pages
  • 189 x 246 x 6mm | 227g
  • United States
  • English
  • black & white illustrations
  • 1236752627
  • 9781236752628