. Bulletin. Natural history. THE POSTCRANIAL SKELETON OF AFRICAN CYNODONTS 175 the proximal end of the tibia, as in pelycosaurs. However, the distal femoral facets for the tibia are no longer parallel to the femoral axis as in pelycosaurs but are inclined to an angle of about 45° to the femoral axis (see above, p. 172). This signifies that the distal end of the femur was held in a position lower than the level of the acetabulum (Figs. 51B, heavy tine; 52B). Yet the cynodont condition is not more mammalian than. FIG. 51. Pelvis and hindlimb orientation as reconstructed in A, a pelycosaur and B,
. Bulletin. Natural history. THE POSTCRANIAL SKELETON OF AFRICAN CYNODONTS 175 the proximal end of the tibia, as in pelycosaurs. However, the distal femoral facets for the tibia are no longer parallel to the femoral axis as in pelycosaurs but are inclined to an angle of about 45° to the femoral axis (see above, p. 172). This signifies that the distal end of the femur was held in a position lower than the level of the acetabulum (Figs. 51B, heavy tine; 52B). Yet the cynodont condition is not more mammalian than. FIG. 51. Pelvis and hindlimb orientation as reconstructed in A, a pelycosaur and B, a cynodont compared with that in C, a mammal. On the left are anterior views, on the right lateral views. Not to 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, Peabody Museum of Natural History, Yale University
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