. Bulletin. Natural history. THE POSTCRANIAL SKELETON OF AFRICAN CYNODONTS 159. pig. 44. Right ilium of cf. ?Cynognathus (?Diademodon), BPI 1675, in lateral view. The small, round depression in the center of the blade is probably the result of post-mortem damage, and perhaps represents a tooth mark. XI. Abbreviations: a f il, acetabular facet of the ilium; a n, acetabular notch; / is, facet for articulation with the ischium; / pu, facet for articulation with the pubis; il is, ischial process of the ilium; il p, pubic process of the ilium; spa bu, supra-acetabular buttress. tral edge which is s
. Bulletin. Natural history. THE POSTCRANIAL SKELETON OF AFRICAN CYNODONTS 159. pig. 44. Right ilium of cf. ?Cynognathus (?Diademodon), BPI 1675, in lateral view. The small, round depression in the center of the blade is probably the result of post-mortem damage, and perhaps represents a tooth mark. XI. Abbreviations: a f il, acetabular facet of the ilium; a n, acetabular notch; / is, facet for articulation with the ischium; / pu, facet for articulation with the pubis; il is, ischial process of the ilium; il p, pubic process of the ilium; spa bu, supra-acetabular buttress. tral edge which is swollen into a rod-like buttress extending from the posterior end of the ilium to the supra-acetabular buttress. In Diademodon, Cynognathus and other cynodonts a slight thickening of the blade occurs in an area anterodorsal to the ace- tabulum. This thickening is manifested on the lateral surface of the iliac blade by a low, vertical ridge which thus delineates two shallow fossae of unequal size (Figs. 44, 46A) ; the anterior and smaller of the two fossae may represent some differentiation of the gluteal musculature, the mammalian homologue of the M. ilio-femoralis of rep- tiles. The bone surface texture of the entire lateral surface of the iliac blade is com- monly smooth and devoid of muscle markings. In larger cynodonts the lateral surface may bear a small number of irregularly spaced striations radiating away from the neck (st, Fig. 45A). The medial surface of all cynodont ilia bears a pattern of striations ra- diating away from, but not quite reaching, the neck (st. Fig. 46B). Striations are most strongly developed on the anterior half of the blade where they may extend to the an- terior and dorsal margin. The striations on the medial iliac surface record the presence of extensive connective tissue in the sacroiliac Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appear
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