Page:The Osteology of the Reptiles.pdf/92

The Skull of the Rhynchocephalia

(Figs. 60–63)

[No manuscript. Some skull characters are noted on pages 20, 21, 25, 213, 279.]

Fig. 60. Rhynchocephalian skull: Sphenodon (Tuatera), from the side and above. pm, premaxilla; n, nasal; prf, prefrontal; f, frontal; pf, postfrontal; p, parietal; po, postorbital; sq, squamosal; m, maxilla; j, jugal; qj, quadratojugal; q, quadrate; c, coronoid; sa, surangular; art, articular; pa, prearticular; d, dentary; an, angular.

Fig. 61. Thalattosaur skull: Thalattosaurus, from above and from the side. After Merriam. One eighth natural size.