The Fauna of Rancho La Brea Volume 1

The Fauna of Rancho La Brea Volume 1

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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. 1911 edition. Excerpt: ... exemplified in no. 10856, in which there is only the merest trace of a tubercle on the posterior border of the cingulum. In other cases (no. 10893) there is a distinct posterior basal cusp, and behind it a posterior basal tubercle. P' is also relatively small compared with the sectorial. (Ratio of anteroposterior diameter in P' and P' 19:32 in C. dirus no. 10856, and 16.5:24.5 in a C. pambasileus from Alaska). There is a distinct posterior cusp present, and a very small basal tubercle is usually developed on the posterior border of the cingulum. The small posterior basal tubercle seems to be present more frequently than in the Recent wolves. The protocone is in general not made relatively smaller than in the Recent species through the regular addition of the posterior basal tubercle. The protocone commonly tends to be relatively large anteroposteriorly. P' is relatively large compared with all of the other premolars. The blade is massive, though not much thicker transversely in relation to the size of the skull in general than in the Recent wolves. The deuterocone is usually small, and the root supporting it does not ordinarily project as far toward the median line as in the modern wolves. Though usually distinctly set off from the protocone, the deuterocone is in some cases entirely reduced. A peculiar feature appearing in quite large percentage of the specimens is found in the development of a sharply angular ridge on the lower side of the cingulum on the outer side of the tritocone. The character of this ridge is in general similar to that of the lower side of the cingulum on the outer side of the upper molars. In one instance (no. 10830) this ridge is very largely developed on the left P', and several...show more

Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236778014
  • 9781236778017