Discovery reports (1947) Discovery reports discoveryreports23inst Year: 1947 34 DISCOVERY REPORTS The last sternal bone has again an uneven anterior border, the left side being in advance of the right. It is without anterior notch. The posterior margin has a deep, angular notch extending nearly to the middle of the bone; in the South Australian specimen it is wide and shallow. There are three facets on each side for sternal ribs, one at each antero- and postero-lateral corner and one midway between these. The ventral surface of the bone is raised into a low, ill-defined tubercle. SCAPULA (Fi
Discovery reports (1947) Discovery reports discoveryreports23inst Year: 1947 34 DISCOVERY REPORTS The last sternal bone has again an uneven anterior border, the left side being in advance of the right. It is without anterior notch. The posterior margin has a deep, angular notch extending nearly to the middle of the bone; in the South Australian specimen it is wide and shallow. There are three facets on each side for sternal ribs, one at each antero- and postero-lateral corner and one midway between these. The ventral surface of the bone is raised into a low, ill-defined tubercle. SCAPULA (Fig. lo) Both the scapulae of the Discovery specimen are damaged posteriorly. Anteriorly the evenly convex dorsal margin meets the straight anterior margin at almost a right angle, not being broadly rounded as in the South Australian specimen. The acromion, as in the latter specimen, is bent upwards and inwards, the superior and inferior margins being parallel to each other and the distal margin rounded. It is shorter than in the South Australian specimen. The coracoid is without the distal expansion noted in the South Australian'specimen, but is otherwise similar in position and shape. Fig. 10. Scapula. ( x .) Fig. II. Hyoids. ( x .) HYOIDS (Fig. II) The thyro-hyals are not fused to the basi-hyal. The basi-hyal has a short, straight anterior margin and deeply concave posterior margin. The lateral portions of the bone which are convex are rugose, and are completely occupied by the facets for connexion with the thyro-hyals. The thyro-hyals are wing-like in shape, and stoutest at their proximal ends where there is a broad area for attachment to the basi-hyal. The bones diminish in thickness from the anterior to the posterior border, where the upper and lower surfaces meet in a ridge at a very acute angle. The distal tips of the thyro-hyals are truncated and rugose. The tympano-hyals are elongate, flattened and tapering at each end to a truncated rugose tip. The thickness of the
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