. Revision of the Amphibia and Pisces of the Permian of North America. Fig. 36.—Trimtrorhaehis insignis. No. 4557 Am. Mus. A. Top view of a skull. X f. B. Another skul! carrying same number as that shown in A, showing such sutures as can be made out. X f. Lettering as usual. C. Lower view of same skull shown in B. X f. pt, pterygoid. D. Lower surface of skull shown in A. X yi. pt, pterygoid; pa, parasphenoid. the lower surface the elongate parasphenoid joins a well-formed basioccipi-tal, which bears a single, oval occipital condyle with a concave, articularface. The pterygoids send processes i
. Revision of the Amphibia and Pisces of the Permian of North America. Fig. 36.—Trimtrorhaehis insignis. No. 4557 Am. Mus. A. Top view of a skull. X f. B. Another skul! carrying same number as that shown in A, showing such sutures as can be made out. X f. Lettering as usual. C. Lower view of same skull shown in B. X f. pt, pterygoid. D. Lower surface of skull shown in A. X yi. pt, pterygoid; pa, parasphenoid. the lower surface the elongate parasphenoid joins a well-formed basioccipi-tal, which bears a single, oval occipital condyle with a concave, articularface. The pterygoids send processes inwards to join the parasphenoid, andbackward to the quadrate region. The anterior processes of the pterygoidare very narrow, with concave inner edges, leaving very large palatal vacui-ties. The posterior portion of parasphenoid and the pterygoids are coveredwith fine teeth. In two specimens, considered by Cope as T. insignis, there is consider-able difference in the parasphenoid and basioccipital bones. In No. 4565, io8 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH
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