. Bulletin. Natural history; Natuurlijke historie. 104 PEABODY MUSEUM BULLETIN 42 .a-. Fig. 33. Anterior view of the manubrium of Stylinodon mirus, YPM 11096. Abbreviations: a = anterior tip; cc = facet for costal cartilage; k = keel; m = facet for first mesosternum. Scale is 4 cm long. large, massive, relatively short and decrease in length (anteroposteriorly) poste- riorly. They bear the large, high vertical spines which decrease in size posteriorly. The spine of the first dorsal vertebra rises vertically to a height above that of the occiput of the skull. It is flattened transversely and el
. Bulletin. Natural history; Natuurlijke historie. 104 PEABODY MUSEUM BULLETIN 42 .a-. Fig. 33. Anterior view of the manubrium of Stylinodon mirus, YPM 11096. Abbreviations: a = anterior tip; cc = facet for costal cartilage; k = keel; m = facet for first mesosternum. Scale is 4 cm long. large, massive, relatively short and decrease in length (anteroposteriorly) poste- riorly. They bear the large, high vertical spines which decrease in size posteriorly. The spine of the first dorsal vertebra rises vertically to a height above that of the occiput of the skull. It is flattened transversely and elongated anteroposteriorly. Its dorsal tip is even further expanded anteroposteriorly. The spines of the fol- lowing thoracic vertebrae quickly decrease in size posteriorly and are angled posteriorly rather than standing relatively vertically. The thoracic vertebrae bear large, concave, dorsally placed capitular articular surfaces. The central vertebral canal is large and subcircular in shape. The metapophyses, anapophyses, and anterior and posterior zygapophyses all appear to be relatively large and well- developed. The centra of the posterior thoracics in AMNH 107954 appear to be deeper dorsoventrally than they are wide transversely. The more anterior thoracic vertebrae are short and wide transversely and less deep than wide. The proximal surfaces of the vertebrae are slightly convex and the distal surfaces are slightly concave. No lumbar or sacral vertebrae of Stylinodon have been identified positively. Matthew (1937, pi. 64) reconstructed Psittacothenum with seven lumbar verte- brae based on AMNH 2455, which has since been referred to Pantolambda (see above). It would appear reasonable that Stylinodon would have five to seven lumbar vertebrae (the primitive number, cf. Gregory 1910). The number of sacral vertebrae is also unknown. A number of isolated caudal vertebrae, consisting of centra with the processes broken off, are preserved in USNM 16664 and UW 2270. Matthew (1937,
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