. Bulletin - United States National Museum. Science. 28 BULLETIN 89, UNITED STATES NATIONAL MUSEUM. openings are oval iii outline and are in a line nearly parallel with the top of the ; The great vertical depth of the median part of the lower jaw is especially note- worthy. A measurement taken below the orbit shows it to be over one-half the whole depth of the head, an unusual proportion in dinosaurian anatomy. From a superior view the wedge-shaped form of the skull is still apparent. The only visible openings are the small subcircular supratemporal fossae. There are no supraorbital
. Bulletin - United States National Museum. Science. 28 BULLETIN 89, UNITED STATES NATIONAL MUSEUM. openings are oval iii outline and are in a line nearly parallel with the top of the ; The great vertical depth of the median part of the lower jaw is especially note- worthy. A measurement taken below the orbit shows it to be over one-half the whole depth of the head, an unusual proportion in dinosaurian anatomy. From a superior view the wedge-shaped form of the skull is still apparent. The only visible openings are the small subcircular supratemporal fossae. There are no supraorbital vacuities as found in Oamptosaurus and Iguanodon, this region being entirely roofed over by the supraorbital and postfrontal bones. This view is well shown in plate 6. Viewed from the back, as shown m plate 9, figure 2, the skull and mandible present a nearly quadrate outline. In its general proportions and outlines the skull of Stegosaurus is found to resemble that of Oamptosaurus more nearly than that of any other American dinosaur, though it should be borne in mind that the shape and arrange- ment of their constituent ele- ments differ considerably. Basioccipital (ho.).âThe basioccipital is terminated posteriorly by a moderately broad, rounded occipital con- dyle. The smooth articular surface is continued forward on the underside (pis. 5 and Fig. â !.âPosterior view of the skull or Stegosaurus stenops? Marsh. 7, Oc). The condyle in No. , J Nat. size. 65, ; £, exocotital; 4Q04 J âââ JJp â1^Jâ p, ; , paraoccipitai.; so, supbaoccipital; Sj, squamosal. ^^"^^ ^^ COUSKieiaoiy narrower transversely than in skulls Nos. 2274 and 6645, as may be seen by comparing 4 and 5 with figure 2, plate 9. The occipital condyle is inclined ventrally to the longer axis of the skull, so that when articulated with the neck the longer axis of the skull would form an obtuse angle with the axis of the anterior cervical verte
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