. Breviora. 1973 CYNODOXT POSTCRANIAL MATERIALS 11. Figure 6. Probelesodon lewisi, a, left clavicle in lateral view; b, inter- clavicle in ventral view; c, ulna; d, radius of right side seen from extensor surface. All from MCZ 4002. X 1. \-elopment of a median ridge more posteriorly. The left cla\icle is well preser\"ed in MCZ 4002 (Fig. 6a). It is of typical cynodont build. Its length, measured directly between the ends, is 51 mm. The relati\ely thin shaft curves about 45° between proximal and distal ends. The dorsal end is somewhat expanded and excavated medially for acromial apposition
. Breviora. 1973 CYNODOXT POSTCRANIAL MATERIALS 11. Figure 6. Probelesodon lewisi, a, left clavicle in lateral view; b, inter- clavicle in ventral view; c, ulna; d, radius of right side seen from extensor surface. All from MCZ 4002. X 1. \-elopment of a median ridge more posteriorly. The left cla\icle is well preser\"ed in MCZ 4002 (Fig. 6a). It is of typical cynodont build. Its length, measured directly between the ends, is 51 mm. The relati\ely thin shaft curves about 45° between proximal and distal ends. The dorsal end is somewhat expanded and excavated medially for acromial apposition. A well-defined ridge descends the posterior margin of the shaft and continues on to the posterior margin of the \-entral expansion for articu- lation with the interclaxicle. Of the primary girdle in MCZ 3781, an obscure fragment of the left scapula is present; the girdle of the right side is present, but is poorly preserved and incompletely seen (Fig. 7). On the re\erse side is visible the glenoid region and incomplete coracoids, in poor condition: on the ob\'erse is the medial sur- face of the scapular blade. This is, as in other chiniquodonts, imusually tall and narrow, with a length (probably incomplete) from the glenoid articulation with the coracoid of 55 mm, and a width at mid-height of 11 mi-i. The exposed medial surface of the blade is strongly convex in the transverse plane and obviously the external surface was strongly ridged longitudinally on both front and back margins. In MCZ 4002 a scapular blade was present, but is represented bv little but an imoression. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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