. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 48 SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7. Fic. 23.—Petrolacosaurtis kansensis Lane. Tibia and fibula, X 1-5. (A-B) Dorsal and ventral views of the left tibia in KUVP 9951. (C) Distal articular surface of (B). (D-E) Dorsal and ventral views of the left fibula in KUVP 9951. medial and lateral ridges. The medial ridge for the interosseous ligament is blade-like. The medial margin of the fibula, formed by the above ridge, is slightly concave. The pr
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 48 SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7. Fic. 23.—Petrolacosaurtis kansensis Lane. Tibia and fibula, X 1-5. (A-B) Dorsal and ventral views of the left tibia in KUVP 9951. (C) Distal articular surface of (B). (D-E) Dorsal and ventral views of the left fibula in KUVP 9951. medial and lateral ridges. The medial ridge for the interosseous ligament is blade-like. The medial margin of the fibula, formed by the above ridge, is slightly concave. The proximal portion of the filiula is somewhat twisted in relation to the distal one. The proximal articulatory surface for the femur is key-hole shaped, due to crushing. The distal surface, on the other hand, is elongate and divided into distinct astragalar and cal- caneular areas. Mantis.—The manus is well represented by eight specimens. Nearly all features of the manus are seen in both dorsal and ven- tral views. The general number and arrange- ment of bones resembles closely that of cap- torhinomorphs. The preserved carpal bones are cither in perfect articulation, or only slightly disarticulated. All the elements are well ossified with fully developed articulating surfaces. They appear to have fitted com- pactly together to form a well knit structure with little cartilage between articular sur- faces (Fig. 21). In general proportions, the carpus in Pe- frolacosaurus is similar to that in Araeoscelis (Vaughn, 1955). It is slightly more elongate than the carpus in primitive captorhinomoqihs (Carroll and Baird, 1972). This elongation is probably related to the elongation of the radius and ulna. The ulnare is the largest element of the carpus, is attached proximally to the ulna and the small pisiform, and is supported distally by the fourth and fifth distal carpals. It varies in outline from a discoid in KUVP 8355 to a highly elongate structure in KUVP 33606, equal in length to
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