Archive image from page 16 of A diapsid reptile from the. A diapsid reptile from the Pennsylvanian of Kansas . diapsidreptilefr00reis Year: 1981 B Fig. 3.—Petrolacosaurus kansensis Lane. Reconstruction of skull in dorsal (A), and ventral (B) views, based mainly on specimens KUVP 9952, 33606 and 33607, X 2. See Fig. 2 for key to abbreviations. about 13 mm below the posterior edge of the parietal. The largest openings in tlie skulls are the orbits. Each occupies 38 per cent of the total skull length. The orbits incise the skull table deeply. The upper temporal fenestra faces mainly dorsally,
Archive image from page 16 of A diapsid reptile from the. A diapsid reptile from the Pennsylvanian of Kansas . diapsidreptilefr00reis Year: 1981 B Fig. 3.—Petrolacosaurus kansensis Lane. Reconstruction of skull in dorsal (A), and ventral (B) views, based mainly on specimens KUVP 9952, 33606 and 33607, X 2. See Fig. 2 for key to abbreviations. about 13 mm below the posterior edge of the parietal. The largest openings in tlie skulls are the orbits. Each occupies 38 per cent of the total skull length. The orbits incise the skull table deeply. The upper temporal fenestra faces mainly dorsally, but is also visible in lateral view because of the curvature of the circumtcm- poral bones. The lower temporal fenestra, on the other hand, faces mostly laterally, but is also visible from the dorsal aspect. Its pos- teroventral corner is not preserved. The post- orbital bar, composed of parts of the post- frontal, postorbital, and jugal is slender; the orbit and temporal fenestra are, therefore, not widely separated. The external naris is relatively large in relation to the skull. This opening faces an- terolaterally and only slightly dorsally. The external naris is floored laterally by a shelf formed by the premaxilla and maxilla. A large pineal foramen opens dorsally on the midline, approximately at the level of the anterior margin of the upper temporal fe- nestra. The lower jaw, as reconstructed (Fig. 2), has the principal dimensions listed in Table 1.
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