. Bulletin - United States National Museum. Science. Fig. 17.—Postekior cervical teetebka op Stegosaukus totgulatus? Maksh. Cat. no. 7348, }N,it. size. 1, Side view. 2, Obuque front view, i, diapophtsis; 11, neural canal; p, parapophysis; s, neu- RAL spine: Z, ANTERIOR ZTGAPOPHYSIS; Z', POSTERIOR ZTGAPOPHYSIS. The The prezygapophyses are wide apart and considerably raised above the diapophyses in the anterior vertebrae, but brought more to their level in the posterior cervicals. Neural spines are not present, except in the most posterior cervicals, although there is a weak, median, cr
. Bulletin - United States National Museum. Science. Fig. 17.—Postekior cervical teetebka op Stegosaukus totgulatus? Maksh. Cat. no. 7348, }N,it. size. 1, Side view. 2, Obuque front view, i, diapophtsis; 11, neural canal; p, parapophysis; s, neu- RAL spine: Z, ANTERIOR ZTGAPOPHYSIS; Z', POSTERIOR ZTGAPOPHYSIS. The The prezygapophyses are wide apart and considerably raised above the diapophyses in the anterior vertebrae, but brought more to their level in the posterior cervicals. Neural spines are not present, except in the most posterior cervicals, although there is a weak, median, crest- like ridge, which eventually develops into a true spinous process. On account of the damaged condition of these processes I am unable to determine the first vertebrae having such a process. Dors ally the neural arch consists of a broad, trans- versely rounded surface which extends upward and backward, the posterior termination giving off the divergent branches of the post-zygapophyses. height of the arch gradually increases posteriorly. Dorsal vertebrae {T^xQs&.Q,va\.s 11 to 26).'—The dorsal vertebrae of Stegosaurus are characterized by the great height of the neural arch and the upward thrust of the transverse processes. The centra of the posterior half of the vertebral column are trans- versely compressed, being shal- lowly concave antero-poste- riorly and somewhat flattened vertically. All of the vertebrae are without lateral cavities. In the anterior dorsals the depth of the concave articular ends of the centra exceeds that of the posterior ends, but pos- terior to the median dorsal region the two ends are sub- equal in this respect. In the table of measure- ments on page 53 it will be FIG. DORSAL VERTEBRA OP f^^^^^^'^^^^'-^^l^^^^-. obscrvcd that the ccutra grad- z, ANTERIOR ually incrcaso in length from the thirteenth to the twentieth, the latter being the longest of the entire vertebral series in No. 4934. From this point posteriorly they gradual
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