Archive image from page 20 of A diapsid reptile from the. A diapsid reptile from the Pennsylvanian of Kansas . diapsidreptilefr00reis Year: 1981 1980 PENNSYLVANIAN DIAPSID REPTILE 11 Fig. 6.—Pctrolacosaurus kansensis Lane. Mature skull and caudal vertebrae, partially scattered, KUVP 9951, X 2. Braincase of same specimen shown in Fig. 7. See Fig. 2 for key to abbreviations. reach its greatest vertical expansion immedi- ately behind the level of the caniniform teeth, one-third of the distance from the anterior end of the maxilla. From this summit, the dorsal border of the maxilla slopes gent
Archive image from page 20 of A diapsid reptile from the. A diapsid reptile from the Pennsylvanian of Kansas . diapsidreptilefr00reis Year: 1981 1980 PENNSYLVANIAN DIAPSID REPTILE 11 Fig. 6.—Pctrolacosaurus kansensis Lane. Mature skull and caudal vertebrae, partially scattered, KUVP 9951, X 2. Braincase of same specimen shown in Fig. 7. See Fig. 2 for key to abbreviations. reach its greatest vertical expansion immedi- ately behind the level of the caniniform teeth, one-third of the distance from the anterior end of the maxilla. From this summit, the dorsal border of the maxilla slopes gently posteroventrally in an almost straight line. The lateral surface of the bone is pierced by small labial foramina, probably for cutaneous branches of the superior alveolar nerve and the maxillary artery. The lower margin is nearly straight, as in primitive captorhino- morphs and younginid 'eosuchians.' The internal surface of the maxilla is more important taxonomically than the lateral. As in all primitive reptiles, the simple conical subthecodont maxillary teeth are attached to
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