Reports of the Princeton University Expeditions to Patagonia, 1896-1899 Volume 4, No. 3

Reports of the Princeton University Expeditions to Patagonia, 1896-1899 Volume 4, No. 3

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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. 1906 edition. Excerpt: ... Fig. 6. Plata Museum (text-fig. 6) shows that this tooth supports a prominent central cusp, but the minuter details can not be ascertained from the photograph. The first two molars are of the same size, the third is a little narrower transversely and the fourth greatly reduced. All, except the fourth, are triangular in outline and tricuspidate, with conic cusps, a narrow external cingulum and reduced metacone spur. An antero-external style, designated by Bensley, style ab (Bensley, 1903, pp. 89, 183 et seq.), is present on all the molars as a distinct tubercle. Style c is well developed on the second and third molars of Microbiotherium tehuelchum, but is only slightly differentiated from the cingulum in M. tortor. On the anterior molars the metacone is decidedly larger than the paracone. The metacone spur is greatly reduced compared with its condition-in Didelfthys or Dasyurus, owing to the decreased width of the cingulum. MA has the metacone vestigial. The cusps represented on this tooth are the protocone, paracone, style ab and the vestigial metacone. The protocone is supported on a separate root, as in Didelphys. On the three anterior molars the protocone encloses a basin-shaped depression, on the margins of which two minute cuspules are developed. In shape and pattern, these teeth resemble closely the molars of some of the subspecies of Caluromys. All the upper molars are triple-rooted. The lower incisors are spatulate in shape, resembling the incisors of Dasyurus rather than Dideiphys. Unlike these genera, the root of the second tooth in the series is not displaced posteriorly with reference to the roots of the first and third. The first and second incisors only are preserved in the mandible associated with skull No. 15,698. The canine more

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  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123649475X
  • 9781236494757