. Carnegie Institution of Washington publication. PERMO-CARBONIFEROUS VERTEBRATES FROM NEW MEXICO. 49 in life it doubtless had a considerable convexity below, the front end turned upward. The dilated end is concave above, convex below, and grooved on each side for the attachment of the clavicle. Clavicles: Both clavicles are entire and firmly attached to the interclavicle, but are compressed and somewhat distorted. Figures 29 s and c have been made from an isolated specimen which agrees perfectly and is undistorted. As seen, the mesial extremity is only a little dilated in comparison with the
. Carnegie Institution of Washington publication. PERMO-CARBONIFEROUS VERTEBRATES FROM NEW MEXICO. 49 in life it doubtless had a considerable convexity below, the front end turned upward. The dilated end is concave above, convex below, and grooved on each side for the attachment of the clavicle. Clavicles: Both clavicles are entire and firmly attached to the interclavicle, but are compressed and somewhat distorted. Figures 29 s and c have been made from an isolated specimen which agrees perfectly and is undistorted. As seen, the mesial extremity is only a little dilated in comparison with the clavicles of both Varanosanrus and Dimetrodon. Of this extremity, the upper side is moderately concave, the lower convex, and both sides have conspicuous radiating ridges and grooves, more pronounced near the margins. The slender stem turns upward and outward, in the articulated position, at an angle of about 130 degrees. As articu- lated, the upper ends are about 125 mm. apart. The front border is thickened throughout; the posterior border of the dilated part is thin. Beyond the dilated. Fig. 29.—Ophiacodon mirus Marsh, X }4. A, clavicular girdle from below; B, right clavicle from in front; C, right clavicle from within; D, right scapula-coracoid, outer side. part, on the posterior side, there is an everted, thin flange, which overlaps the lower front border of the scapula. Distally the shaft for a short distance is oval in cross- section, the posterior border only a little thinner and without a surface for attach- ment to the scapula. Still more distally the outer anterior side is flattened and grooved, and striate, as though for the articulation of a slender cleithrum, of which, however, no definite evidence has been found in the specimen. Scapula-coracoid: The scapula-coracoid of the right side is very little dis- torted (fig. 29 d). The front border of the scapula, however, was so intimately united to the clavicle that it could not be recovered entire. On the left side t
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