Bulletin (1969) (20233310850) - Public domain natural history illustration

Title: Bulletin
Identifier: bulletin30peab (find matches)
Year: 1969 (1960s)
Authors: Peabody Museum of Natural History
Subjects: Natural history; Natuurlijke historie
Publisher: New Haven : The Museum
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library



Text Appearing Before Image:
54 PEABODY MUSEUM BULLETIN 30 A
Text Appearing After Image:
FIG. 33. Fourth (?) dorsal vertebra of Deinonychus antirrhopus, YPM 5204, in posterior (A), left lateral (B) and dorsal (C) views. Notice the curved form of zygapophyseal facets. Abbreviations: dp—diapophysis; hy—hyposphene; k—sagittal keel; li—scar of interspinous ligament; pi—pleu- rocoel; po—postzygapophysis; pp—parapophysis; pr—prezygapophysis. The centra are amphiplatyan or slightly platycoelous and nearly circular in end view. Anteriorly, centrum length is slightly more than height or width, the latter being subequal. Posteriorly, height and width exceed the length by more than 60%. The ends of the centra flare out to maximum circumference but at mid-length the centra are constricted and lateral and ventral surfaces are strongly concave longitudinally. Anterior and posterior centrum surfaces are parallel throughout the dorsal series and perpendicular to the floor of the neural canal and none show the ventral "wedging" reported by Gilmore (1920: p. 40) in Allosaurus and by Osborn (1917: pi. 27) in Tyrannosaurus. Lateral surfaces are marked by deep, slit-like pleurocoels just beneath and parallel to the neural arch suture. Ventral keels are absent on all except the first five or six dorsals. The neural arch and spine account for nearly two thirds of the vertebral height. At the anterior limit of the arch pedicel, just above the suture, is a prominent peduncle-like process that terminates in a "cupped"