. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 83. ca ca FIG. 51. Dorsal ribs of Deinonychus antirrhopus in posterior view. A) an anterior rib (YPM 5245); B) mid-dorsal rib (\'PM 5249); C) posterior dorsal rib (YPM No. 5249). Arrows indicate location of cross sections. Abbreviations: ca—capitulum; tu—tuberculum. down from the latter articulation. Proximally, the shaft is almost T-shaped, being expanded externally to form slight anterior and posterior "shoulders" that surmount the main shaft. This superficial expansion of the shaft diminishes d
. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 83. ca ca FIG. 51. Dorsal ribs of Deinonychus antirrhopus in posterior view. A) an anterior rib (YPM 5245); B) mid-dorsal rib (\'PM 5249); C) posterior dorsal rib (YPM No. 5249). Arrows indicate location of cross sections. Abbreviations: ca—capitulum; tu—tuberculum. down from the latter articulation. Proximally, the shaft is almost T-shaped, being expanded externally to form slight anterior and posterior "shoulders" that surmount the main shaft. This superficial expansion of the shaft diminishes distally until at mid-length only a faint groove remains on the anterior surface. The distal half of the shaft is oval in section, the greatest diameter being longitudinal, not transverse. The maximum rib length known is 300 mm, mea- sured along the curve of the shaft from tuberculum to distal termination. Of the long ribs, six are preserved intact, with expanded distal ends that show an osseous articulation existed between the dorsal and sternal ribs. A number of incomplete, short ribs are among the materials from the Yale site. Some of these might be from a juvenile, but on the basis of the relation- ship of the two heads, and in the absence of any other evidence of immature individuals at this site, I have concluded that these must represent the last thoracic ribs (Fig. 51C). One of these, from which the extremity is missing, measures 49 mm in length (from the tuberculum) and probably did not exceed 60 mm. A second rib is nearly twice as large in most dimensions and may have. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. New Haven : The Museum
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