. Carnegie Institution of Washington publication. io8 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA. A~ —D Fig. 37.—T. insignis. A. Outline of base of skull. No. 4565 Am. Mus. X |. B Cross-section of occipital condyle of same. C. Outllneof base of skull. No. 4557 Am. Mus. X |. D. Cross-section of occipital condyle of same. the type, the sides of the posterior part of the parasphenoid are much rnpre sharply cut out and the whole region is narrowed; the section of the occipital condyle is broadly heart-shaped. In No. 4557 the same region ismuch broader, and the section of the occipital con
. Carnegie Institution of Washington publication. io8 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA. A~ —D Fig. 37.—T. insignis. A. Outline of base of skull. No. 4565 Am. Mus. X |. B Cross-section of occipital condyle of same. C. Outllneof base of skull. No. 4557 Am. Mus. X |. D. Cross-section of occipital condyle of same. the type, the sides of the posterior part of the parasphenoid are much rnpre sharply cut out and the whole region is narrowed; the section of the occipital condyle is broadly heart-shaped. In No. 4557 the same region ismuch broader, and the section of the occipital condyle is a wide oval. It is pos- sible that these should be reckoned as distinct species, but it seems best to wait for more evidence. It is impossible to make out the sutures between the bones in the anterior part of the palate. The internal nares are far forward, and the palatine and prevomer- ine regions are covered with small teeth; there are no tusks visible. The lower jaws are widely separated posteriorly, due to the width of the skull; they curve forward and inward and meet in a narrow symphysis. The outer surface of the jaw is covered with a beautiful sculpture, which is par- ticularly heavy over the posterior surface and radiates from a point near the lower edge (plate 12, fig. 4). The articular surface is as described by Cope. Just anterior to the articular region, on the inner side, there is a wide open- ing into the Meckelian cavity; there seem to be no anterior openings of this cavity, but two small foramina penetrate the jaw, one just below the articular surface near the posterior end, and another directly below the anterior end of the Meckelian opening. The sutures which have been made out are shown in fig. 38. There is a single series of irregular teeth on the edge of the jaw, except just anterior to the opening of the Meckelian cavity, where there is an oval patch of small, sharp teeth, about 3 cm. long, inside the regular series and separated from it by a d
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