. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. VAUGHN : ARAEOSCELIS RESTUDIED 381 axial plate which is buttressed by a medial, horizontal ridge. The preaxial surface shows two areas for articulation with the astra- galus. One area lies proximal to the perforating foramen; the other lies distal to the foramen and is recessed to articulate with the condyloid corner of the astragalus. The supraforaminal por- tion of the postaxial border of the astragalus overlaps the calcaneum medially; the two elements probably acted as a unit with very little movement between them.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. VAUGHN : ARAEOSCELIS RESTUDIED 381 axial plate which is buttressed by a medial, horizontal ridge. The preaxial surface shows two areas for articulation with the astra- galus. One area lies proximal to the perforating foramen; the other lies distal to the foramen and is recessed to articulate with the condyloid corner of the astragalus. The supraforaminal por- tion of the postaxial border of the astragalus overlaps the calcaneum medially; the two elements probably acted as a unit with very little movement between 6 Fig. 13. A, Tibia, fibula, and distal end of femur, lateral view. B, C, D, Postaxial, medial, and preaxial views of tibia, x 4/3. The direction of the perforating foramen, as demonstrated by the direction of both the astragalar and calcaneal components, indicates that the artery must have passed from the medial surface distally and outward to the lateral surface. This is the same direction in which the foramen runs in, , pelycosaurs. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
