. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 67 canal, well-developed, wedge-shaped articular processes meet in the mid-line, but apparently do not co-ossify. A number of similar chevrons were found isolated in the Yale quarry and are believed to represent more proximal chevrons of Deinonychus (Fig. 40). The adjacent chevron in this specimen (YPM 5203), which articulates with the 9th and 10th caudals, is totally different in form (Fig. 4IB). Instead of a compressed, longitudinally expanded sagittal blade, the 9th chevron flares out transversely into a
. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 67 canal, well-developed, wedge-shaped articular processes meet in the mid-line, but apparently do not co-ossify. A number of similar chevrons were found isolated in the Yale quarry and are believed to represent more proximal chevrons of Deinonychus (Fig. 40). The adjacent chevron in this specimen (YPM 5203), which articulates with the 9th and 10th caudals, is totally different in form (Fig. 4IB). Instead of a compressed, longitudinally expanded sagittal blade, the 9th chevron flares out transversely into a flat-bottomed, V-shaped structure the apex of which is directed caudally. The anterior ends of the V extend forward an unknown distance (at least to the anterior end of the 8th caudal) as double bony rods on each side. Clearly, this is the most proximal chevron bearing these unusual bony rods. Presumably the rods from this segment were the shortest of the entire series, although at least 9 caudals occur in front of this chevron. Chevron rods are preserved with both the 9th and 8th caudals, so those of this chevron clearly extended at least 2 segments forward, but I suspect that they did not extend much beyond the 7th caudal with the first 5 or 6 caudals entirely free of chevron rods (and probably of the prezygapophyseal rods as well). Except. S 9 10. 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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