On Vertebrata of the Mid-Cretaceous of the North West Territory

On Vertebrata of the Mid-Cretaceous of the North West Territory

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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. 1902 edition. Excerpt: ...makes ten. Cope's determination of the vertebra: in Slereosternum was incorrect. The vertebral formula can be clearly made out as follows: Cervicals.................................... I2 Dorsals 22; or total presacrals..................... 34 Sacrals....................... 2 Caudals..................-. 60-64 In the specimen described by Smith Woodward " the tail comprises not less than sixty vertebra: of which at least the foremost seven bear robust transverse processes caudal ribs gradually diminishing in size backwards." In the specimens I have examined the first eleven caudals bear ribs. In Stereosternum all the vertebra: are amphicoelous and the presacrals are more deeply excavated anteriorly than posteriorly. A continuous small notochordal canal pierces the upper part of each pleurocentrum, as in Pelycosauria. The neuro-and pleuro-centra are firmly coalesced, there being no trace of a neurocen tral suture. Beneath the atlas '_.I.cl. and axis are two narrow and C, 9 apparently free hypocentra, but " there is no trace of hypocentra beneath the other cervicals or the dorsals. The cervical ver-tebrae are short and tranversely extended, the total length of the neck being 58 mm.' or ex-actly the length of the head. The cervical vertebrae are laterally expanded into broad processes (diapophyses) which bear the ribs. The dorsal verte-brae are peculiar in the great bulbous expansion of the upper portion of the neural arches, or neurocentra, which are much Sauropterygia of the 1Veu: t1'e0 sauru: type, the reverse is the case). We can distinguish pre-and postzygapophyses; also in certain vertebrae small zygosphene (Fig. I7, A, z) and zygantrum (Fig. I7, B) articulations above the neural canal. The rib attachments are...show more

Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236918991
  • 9781236918994