. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 62 Annals of the South African Museum. would thus appear that some of the ribs were segmented. Un- fortunately I have no complete series and cannot determine the full nature of this segmentation of the ribs. On the posterior edge of the thoracic ribs an irregular flange is developed to house the insertion of muscles (external oblique abdominal, sacro-spinal, and the inter- costals); on the anterior proximal edge a flange received the latissimus dorsi and serratus Text-fig. 5.—Pareiasaur rib
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 62 Annals of the South African Museum. would thus appear that some of the ribs were segmented. Un- fortunately I have no complete series and cannot determine the full nature of this segmentation of the ribs. On the posterior edge of the thoracic ribs an irregular flange is developed to house the insertion of muscles (external oblique abdominal, sacro-spinal, and the inter- costals); on the anterior proximal edge a flange received the latissimus dorsi and serratus Text-fig. 5.—Pareiasaur ribs, x J. I = atlantal rib. II = 5th cervical rib. III = 1st dorsal rib. IV = mid-dorsal rib. V =last but one dorsal rib. c =capitulum. t =tuberculum. As has already been mentioned, there are 4 sacral ribs; the first is very strong, having a long surface of anchylosis on the centrum and has a still greater distal expansion which clasps the anterior inner surface of the iliac blade; the succeeding three progressively decrease in size and the 4th appears to be only ligamentously attached to the iliac blade. The anterior postsacrals have fairly long and slender ribs fused to the parapophysis. These progressively decrease until eventually they are only wart-like protuberances and are finally absent in the last 15 vertebrae. Systematic.—As is the case in the other parts of the skeleton, the vertebral column of the various genera and species show only differ- ences of degree and not of kind. As a further complication there is. 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 South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
