. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. C. Fig. 9.—Petrolacosaums kanscnsis Lane. (A) Isolated left maxilla, KUVP 33602, exposed in medial view, X 2. (B) Section through maxilla at b-b, X 5. (C) Left parietal from a poorly preserved skull, KUVP 9959a, exposed in ventral view, X 2. (D) Quadrate and quadratojugal from poorly preserved, immature skull, KUVP 33603, exposed in partial ventral view, X 2. See Fig. 2 for key to abbreviations. tive captorhinid Eocaptorhinus laticeps (Hea- ton, 1979). The la
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. C. Fig. 9.—Petrolacosaums kanscnsis Lane. (A) Isolated left maxilla, KUVP 33602, exposed in medial view, X 2. (B) Section through maxilla at b-b, X 5. (C) Left parietal from a poorly preserved skull, KUVP 9959a, exposed in ventral view, X 2. (D) Quadrate and quadratojugal from poorly preserved, immature skull, KUVP 33603, exposed in partial ventral view, X 2. See Fig. 2 for key to abbreviations. tive captorhinid Eocaptorhinus laticeps (Hea- ton, 1979). The lacrimal canal is completely enclosed within the lacrimal bone. The orbital margin of the lacrimal is strongly buttressed. At the level of the an- terior border of the orbit, the lacrimal reaches the alveolar shelf of the maxilla and reinforces the maxillary process where it is sutured with the palatine. This is best seen in Fig. 8, where the suborbital ramus of the right lacri- mal is exposed in medial view. Nasah.—The nasals, exposed both ven- trally and dorsally in KUVP 9952 and 33607, are paired bones lying along either side of the midline of the skull, between the pre- maxillae and the frontals; they form part of the skull roof in the antorbital area. The pair are sutured to each other along most of their length. Each nasal has a posterior process that is well preserved in KUVP 9959b, which diverges from the midline and covers part of the frontals dorsally. Anteriorly, the bone curves strongly down to receive the dorsal process of the premaxilla. The remaining part of the anterior border is free and forms the dorsal border of the external naris. Laterally, the nasal is sutured to the lacrimal and the prefrontal. The lacrimal fits over a depression on the nasal, seen in KUVP 9952 (Fig. 8), whereas the prefrontal is attached to the ven- tral surface of the nasal. The nasal is transversely convex (in cross- section) in the region where it is attached to the lacrimal, formin
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Keywords: ., bookcentury1900, bookcollectionbi, booksubjectpaleontologykansas
