. Bulletin of the Department of Geology. Geology. 1913] Stock: Nothrotherium and Megalonyx 355 the annular and index ;13 There is an equal possi- bility that this is a second left digit of the posterior foot. No. 20003 belongs possibly to either the second or fourth digit of the front foot. In the first phalanx there is no indication of dorso-ventral curvature on the lateral faces of the proximal end nor does the middle articulation narrow ventrally. An offset occurs only on the inferior half of one side. The side bordered proximally by the offset is distinctly narrower than the
. Bulletin of the Department of Geology. Geology. 1913] Stock: Nothrotherium and Megalonyx 355 the annular and index ;13 There is an equal possi- bility that this is a second left digit of the posterior foot. No. 20003 belongs possibly to either the second or fourth digit of the front foot. In the first phalanx there is no indication of dorso-ventral curvature on the lateral faces of the proximal end nor does the middle articulation narrow ventrally. An offset occurs only on the inferior half of one side. The side bordered proximally by the offset is distinctly narrower than the opposite side. On the distal trochlear face, the condyle of the shorter side widens inferiority. On the proximal articular face of the second phalanx the surface articulating with the inferiorly broadened condyle of the first phalanx is very slightly concave. The postero-dorsal ligamental ridges are not prominent. The dorsal surface of the smaller condyle is beveled Figs. 15 and 16. Megalonyx calif or nicus, n. sp. Left caleaneum, no. 20095, X V-t- Rancho La Brea Beds. Fig. 15, view of right side; fig. 16, view of proximal end. Posterior Limb.—The left caleaneum, no. 20095 (figs. 15 and 16) agrees essentially with M. jeffersonii in its differences from the caleaneum of M. sierrensis as described by Important differences exist, however, between the Rancho La Brea caleaneum and the caleaneum of M. jeffersonii. is Leidy, J., A Memoir on the Extinct Sloth Tribe of North America, Smithson. Contrib. Knowl., vol. 7, p. 35, 1855. "Median phalanx" here means the first phalanx of the median digit. " Sinclair, W. J., op. cit., pp. 158-159, pi. 22, figs. 2 and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The
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