. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. GIRDLES AND LIMBS OF DEINOCEPHALIA 197 The two halves, meeting in the median line, are weakly united, and in immature specimens a large lacuna is present, which may persist as a small opening even in older specimens; but in life would be closed with cartilage. The junction of the pubes, parti- 0lag- 4. cularly, is very weak, due to the eversion of the antero-ventral pubic edge. The ichial symphysis is stronger, but here the posterior median edges also diverge and no strong sym- physial carina i
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. GIRDLES AND LIMBS OF DEINOCEPHALIA 197 The two halves, meeting in the median line, are weakly united, and in immature specimens a large lacuna is present, which may persist as a small opening even in older specimens; but in life would be closed with cartilage. The junction of the pubes, parti- 0lag- 4. cularly, is very weak, due to the eversion of the antero-ventral pubic edge. The ichial symphysis is stronger, but here the posterior median edges also diverge and no strong sym- physial carina is developed. The attachment to the vertebral column is by a pair of very stout main sacral ribs, assisted by three posterior ribs, which are very much weaker and decrease in functional importance in posterior direction, and by a long slender anterior lumbo-sacral rib usually with a feeble attachment to the everted anterior iliac process. The main sacral rib lies above and in the same plane as the acetabulum — it is thus not pre-acetabular but supra- acetabular. The acetabulum is large and roughly circular in outline; all three bones help in its formation, with the iliac part constituting a half to two thirds. The acetabulum faces mainly outwards except in the Anteosauria where it is directed considerably ven- trally. It is fairly shallow but with strong raised rims for the attachment of the joint capsule and ligaments. Dorsally a very strong buttress, stronger in the Titanosuchia than in the Tapinocephalia, overhangs the acetabulum (except in the Anteosauria), and this receives the main thrust of the femur. In its dorso-posterior corner, just posterior to the edge of the buttress, lies the large supra-acetabular notch. The ilium is constricted above its acetabular part to form a neck or shaft; above this the blade is antero-posteriorly elongated, with a fairly long anterior iliac process and a shorter and weaker posterior process. In the Titanosuchia the supra-acetabular part
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