. Bulletin. Natural history; Natuurlijke historie. POSTCRANIAL BONES 57 were made on the mechanical stage of a microscope with a micrometer reading to mm. Length was measured along the long axis of the shaft from points of tangency at head and distal end, the specimen lying on the slide with the proximal expansion flat. Width of head was measured simi- larly between tangents to the dorsal (extensor) surface and tip of the deltopectoral crest. Width across the epicondyles was taken along a line normal to the length of the bone. Radius: Among the rarest of the limb elements are the slender
. Bulletin. Natural history; Natuurlijke historie. POSTCRANIAL BONES 57 were made on the mechanical stage of a microscope with a micrometer reading to mm. Length was measured along the long axis of the shaft from points of tangency at head and distal end, the specimen lying on the slide with the proximal expansion flat. Width of head was measured simi- larly between tangents to the dorsal (extensor) surface and tip of the deltopectoral crest. Width across the epicondyles was taken along a line normal to the length of the bone. Radius: Among the rarest of the limb elements are the slender radii and ulnae whose dehcate shafts are extremely hable to damage. In contrast to over 200 femora of Cardiocephalus obtained from the Yale sample, only 31 radii and 12 ulnae were recovered. The radius is typical of that of primitive tetrapods, straight, fairly slender with a distinct waist so that it approaches an hourglass figure in anterior aspect. Its proximal end is compressed, the distal end is almost circular, only shghtly flattened posteriorly. Both ends are excavated for cartilaginous extensions similar to the long bones of modern salamanders. Proportions of the radii may be ascertained from figure 27. The length of 25 complete specimens ranges from to mm., the mean being 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 Peabody Museum of Natural History. New Haven : The Museum
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