On the skeleton in new Cynodontia from the Karroo rocks / by H.G. Seeley.

  • Seeley, H. G. (Harry Govier), 1839-1909.
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: On the skeleton in new Cynodontia from the Karroo rocks / by H.G. Seeley. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    proximal end (see fig. 23). This trochanter is completely preserved in the genus Herpetochirus (§ 6, fig. 4). The distal end of the bone is somewhat flattened above, with a broad slight concavity between the condyles in front. The condyles are well developed backward ; and the distal end is not in the same plane with the proximal Fig. 33. Lateral trochanter minor broken. Superior. Internal. Superior and lateral aspects of the right femur, Tribolodon Frerensis. Natural size. end (fig. 33), being rotated inward. The proximal end is inclined upward, and expands transversely; though the inner side of the bone is nearly straight from above down- ward ; and the inner side of the distal end, although marked by a slight angular ridge, is nearly in the same plane with the inferior plate of the trochanter at the proximal end. From this ridge the measurement to the compressed inner margin of the bone is fully inch, though the shaft of the bone is less than -j^- inch thick, and scarcely wider in its upper half. The superior part of the proximal end, which has lost the inner articular condyle, is concave, thin as in Cynognathus, with the external trochanter rounded and reflected upward ; though the preservation does not definitely show whether it includes representatives of both the great trochanter and the third trochanter of Mammals. It is not largely developed, and the bone extends distally for two inches below it. The proximal end begins to contract in width, below the trochanter, so that the least transverse width of the shaft, measured superiorly, is above the middle length. The width of the distal end is inch; the external surface is somewhat oblique at the distal end, and the external contour of the bone is concave in length, so as to be in contrast with the straight inner side. The depth of the distal end at the condyles appears to be about tjr inch, one-ha]f of which at least is to be attributed to the rounded convexity of the inferior distal condyles. The proximal inferior compressed plate of the trochanter minor commences above LT 2