. Revision of the Amphibia and Pisces of the Permian of North America. Fig. 47.—L. tricarinatus. Nos. 4696-4701 Am. Fig. 48.—L. tricarinatus. Univ. of Chicago. X 3 X 3. Restoration of skull. A. After Williston. Upper view of skull, showing su- A, Left; B, Posterior surface; C, Superior sur- tures. Lettering as usual. face; D, Inferior surface. Lettering as B. Same. Lower view of skull, showmg branchial bones. usual. 0, otic opening; or, occipital condyle; pa, neural arches of first vertebra. C. Same. X f. After Broili. Lateral view of a mid- dorsal vertebra. D. Same. Neural spine fr
. Revision of the Amphibia and Pisces of the Permian of North America. Fig. 47.—L. tricarinatus. Nos. 4696-4701 Am. Fig. 48.—L. tricarinatus. Univ. of Chicago. X 3 X 3. Restoration of skull. A. After Williston. Upper view of skull, showing su- A, Left; B, Posterior surface; C, Superior sur- tures. Lettering as usual. face; D, Inferior surface. Lettering as B. Same. Lower view of skull, showmg branchial bones. usual. 0, otic opening; or, occipital condyle; pa, neural arches of first vertebra. C. Same. X f. After Broili. Lateral view of a mid- dorsal vertebra. D. Same. Neural spine from above, showing perma- nent separation of the two halves. without sculpture or rugosities. The various investigators of Lysorophusseem to be in complete accord as to the position and shape of the bones ofthe skull, but differ materially in their interpretation. The upper surface is composed largely of three pairs of bones, thenasals, frontals, and parietals. The nasals are large, paired elements extending to the anterior end ofthe skull; the premaxillaries hav
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Keywords: ., bookcentury1900, bookdecade1910, bookidc, booksubjectpaleontology
