. Carnegie Institution of Washington publication. Fig. 38.—Sphenacodon ferox Marsh, X ,'2. A, right maxillary, imperfect; B, inner surface of fragment of second right maxillary. of the left side does not show this character to anywhere near the same extent. The sutures, so far as they can be made out, are identical with those of the Dime- trodon mandible. The pterygoids are represented by the external processes only; they are indis- tinguishable from the same processes in Dimetrodon. A single row of medium- sized, conical teeth is found on the lower margin. The lower rim of the orbit, formed b
. Carnegie Institution of Washington publication. Fig. 38.—Sphenacodon ferox Marsh, X ,'2. A, right maxillary, imperfect; B, inner surface of fragment of second right maxillary. of the left side does not show this character to anywhere near the same extent. The sutures, so far as they can be made out, are identical with those of the Dime- trodon mandible. The pterygoids are represented by the external processes only; they are indis- tinguishable from the same processes in Dimetrodon. A single row of medium- sized, conical teeth is found on the lower margin. The lower rim of the orbit, formed by the maxilla and jugal, the postorbital bones of the two sides, and the quadrate are indistinguishable from the same bones in Fig. 39.—Sphenacodon ferox Marsh, X A, inner surface of a right ramus; B, quadrate. There can be no doubt of the great resemblance of the skull of Sphenacodon and Dimetrodon—so great a resemblance that, on the strength of this part only, we would not be justified in considering the genera distinct. Three imperfect scapula are preserved in the collection. One, associated with a considerable part of the skeleton in a bad state of preservation, is known only from a fragment of the blade. Another, an isolated specimen, lacks the anterior edge and has the two proximal bones attached (fig. 40 a). The third, also an iso- lated specimen, lacks the anterior border and the border of the coracoids. As a whole the shoulder blade is quite similar to that of Dimetrodon. The sutures between. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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