. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7. Fig. 4.—Petrolacosaurus kansensis Lane. Reconstruction of skull in occipital \ie\v, mainly based on speci- mens KUVP 9951 and 33607, x2. See Fig. 2 for key to abbreviations. Table 1.—Measurements of the skull and lower jaw of Petrolacosaurus kansensis, made primarily on the basis of the restoration of KUVP 33607. Measure- ments of the captorhinomorph Protorothyris archeri are based mainly on the type specim
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7. Fig. 4.—Petrolacosaurus kansensis Lane. Reconstruction of skull in occipital \ie\v, mainly based on speci- mens KUVP 9951 and 33607, x2. See Fig. 2 for key to abbreviations. Table 1.—Measurements of the skull and lower jaw of Petrolacosaurus kansensis, made primarily on the basis of the restoration of KUVP 33607. Measure- ments of the captorhinomorph Protorothyris archeri are based mainly on the type specimen (Clark and Carroll, 1973). Measurements in millimeters. Protorothyris Petrolacosaurus archeri karuensis (MCZ 1532) Length of skull 59 56 Width of skull in the temporal region 33 31 Height of skull at the orbit 20 20 Length of tooth row 33 37 Length of orbit 22 16 Antorbital length 21 22 Temporal length" 13 17 Length of internal naris 17 15 Length of sviborbital fenestra 11 Length of subtemporal fossa 20 20 Length of lower jaw 57 54 Length of tooth row on lower jaw 30 34 Height of lower jaw 10 10 Length of adductor fossa 16 15 Height of adductor fossa 5 7 ° Temporal length is measured from the posterior end of the supratemporal to the orbit. It is a long, slenderly built structure, very nar- row in height and width. The tooth row occupies 53 per cent of the length of the mandible. The coronoid area is gently convex, expanding dorsally well above the level of the alveolar shelf. Posteriorly the dorsal border curves slightly ventrally to the level of the articular. There is no retroarticular process. The ventral border of the ramus is nearly straight. The adductor fossa is long, occupy- ing 30 per cent of the length of the mandible. Between its anterior, strongly acute angle (formed by the coronoid) and its wide, gently concave posterior end (formed by the articu- lar) the fossa expands posteriorly between the prearticular and surangular. The foramen intermandibularis
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