. Carnegie Institution of Washington publication. 60 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA the buccal regions. On the anterior part of the mandible the fossae are distinct; on the median and posterior part the ridges become linear. A narrow triangular space on the external side posteriorly, with its long apex on the inferior margin, is smooth. "There are two subequal obtuse teeth, on the border of each premaxillary bone. I can not count the number on the maxillary, but there are four anterior to the line of the anterior border of the orbit. Of these the next to the anterior one
. Carnegie Institution of Washington publication. 60 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA the buccal regions. On the anterior part of the mandible the fossae are distinct; on the median and posterior part the ridges become linear. A narrow triangular space on the external side posteriorly, with its long apex on the inferior margin, is smooth. "There are two subequal obtuse teeth, on the border of each premaxillary bone. I can not count the number on the maxillary, but there are four anterior to the line of the anterior border of the orbit. Of these the next to the anterior one is larger than the rest, though of the same shortly conic, obtuse form. These teeth are rather large for the size of the skull. At a point near the middle of the ramus of the mandible, where it is broken off, there may be counted five teeth in a transverse series. Of these the second from the external border is the largest, and has a regularly rounded crown. Six teeth may be counted on a transverse fracture of the palatine bone. Of these the four external have obtusely rounded crowns, and the third from the external border is the largest. The crowns of all the teeth are hollow. "Measurements. "Length of cranium to transverse line connecting the posterior borders of the M quadrates °-°77 Width between the same points . 082 Length of axis of cranium to line connecting the anterior borders of the orbits . .018 Interorbital width 032 Longitudinal diameter of the orbit 016 Length from orbit to nostril 015 Projection of muzzle beyond mandible 010 Length of alveolar edge of premaxillary . 007 Height of crown of large maxillary tooth 0045 Fore and aft diameter of maxillary 0035 Width of mandibular ramus below at middle 020" Revised description: This is contained in the revised description of the genus. Pantylus coicodus Cope. Proc. Am. Phil. Soc, vol. xxxiv, 1896, p. 450. Type: An injured anterior half of a cranium. No. 4330 Am. Mus. Nat. Hist. Cope Coll. From Texas. O
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