. Revision of the Amphibia and Pisces of the Permian of North America. kull indicates the presenceof a new species. The skull is imperfect, having lost the anterior end of themuzzle and a portion of the articular region of the left side. The wholeskull is much longer and more slender than any known species of this genus,its proportions being more those of Cricotus than T. insignis. The teethare mostly hidden, but one or two show that they are small and fine. Theorbits are directed more upwards than laterally and they were of greateranteroposterior extent than lateral. The quadrate region of th
. Revision of the Amphibia and Pisces of the Permian of North America. kull indicates the presenceof a new species. The skull is imperfect, having lost the anterior end of themuzzle and a portion of the articular region of the left side. The wholeskull is much longer and more slender than any known species of this genus,its proportions being more those of Cricotus than T. insignis. The teethare mostly hidden, but one or two show that they are small and fine. Theorbits are directed more upwards than laterally and they were of greateranteroposterior extent than lateral. The quadrate region of the skull pro-jects quite far behind the articular portion (cotylus) so that there is a veryprominent excavation of the posterior portion of the skull. The ends of themandibles do not project posterior to the quadrate. The mandibles approacheach other, to contact in the posterior third of their length. The outer sideof the mandible is marked by longitudinal lines of sculpture. The wholeskull contracts sharply anterior to the occipital region, about opposite 46 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA Measurements. M Width of the skull at the quadrate region Width of the skull opposite the orbits 030 Projection of the quadrate region beyond the midline of the skull .013Length of the incomplete skull (about .01 or .02 m. missing)... .052 Revised description: This species was founded on a very imperfect frag-ment of a skull. I am unable, with fuller knowledge, to identify it as belong-ing to Trimerorhachis. It must be dropped as indeterminate. Furtherknowledge may show that the type is a fragment of a skull of the genusCricotillus Case. Trimerorhachis mesops Am. Phil. Soc, vol. xxxiv, 1896, p. 454. Type: An imperfect skull and a good portion of the vertebral 4568 Am. Mus. Hist. Cope Coll. From Texas. Original description: The greater part of the skull and vertebral columnwith ribs and thoracic plates represent this species. The vert
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Keywords: ., bookcentury1900, bookdecade1910, bookidc, booksubjectpaleontology
