. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 132 ANNALS OF THE SOUTH AFRICAN MUSEUM The pelvis is much lower than the pectoral girdle and the pubo-ischiadic plate shorter than the interclavicle, but longer than the coracoidal plate. The three bones of each side are not firmly ankylosed and the junction between the two sides is weak between the pubis but stronger at the ischiadic keel. The acetabulum is large and nearly circular in outline; all three bones take part, with the ilium contributing about half. The acetabulum faces mainly outwards; i
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 132 ANNALS OF THE SOUTH AFRICAN MUSEUM The pelvis is much lower than the pectoral girdle and the pubo-ischiadic plate shorter than the interclavicle, but longer than the coracoidal plate. The three bones of each side are not firmly ankylosed and the junction between the two sides is weak between the pubis but stronger at the ischiadic keel. The acetabulum is large and nearly circular in outline; all three bones take part, with the ilium contributing about half. The acetabulum faces mainly outwards; it is shallow, with strong rims for the attachment of the joint capsule a. Fig. 5. Diagram of the pristerognathid pelvis, a, lateral, b, ventral. a —acetabulum, ap —anterior process of the iliac blade, ife —area of origin of m. ilio-femoralis. ifi —area of origin of m. ilio-fibularis. it —area of origin of m. ilio-tibialis. IL —ilium. IS —ischium, isk —ventral keel of the ischia. ist— ischial tuber. P —pubis, pf—pubic foramen, pp —posterior process of the iliac blade, pt—pubic tuber, sab —supra-acetabular buttress, san —supra-acetabular notch. and ligaments. Dorsally lies a strong supra-acetabular buttress formed by the ilium, overhanging the acetabulum and foiining the main attachment of the joint capsule. At the dorso-posterior comer of the acetabulum, just posterior to the buttress, lies the supra-acetabular notch. At the level of the iliac buttress the iliac blade is antero-posteriorly expanded to form a high anterior and a somewhat lower posterior process. In most specimens the anterior process is much shorter than the posterior process, but in two specimens the lower comer of the anterior process is prolonged to form a long but weak process. In the other specimens there is an indication of this process. More and better-preserved specimens may prove that this elongation is normal for the family. The outer face of the iliac blade is both dorso-v
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
