. Bulletin. Natural history; Natuurlijke historie. FIG. 72. Metatarsal I of Deinonychus antirrhopus. A) B) probable proximal half of the first metatarsal (\TM 5240) in lateral and posterior views; C) and D) the distal half of metatarsal I (\'PM 5217) in lateral and posterior views. Abbreviations: II—articular contact with metatarsal II; II?—possible scar of articular contact with metatarsal II. have been more probable, however, and thus required a resisting external ligament. A single example (YPM 5240) is available of what I consider to be the proximal end of the first metatarsal (Fig. 72A an
. Bulletin. Natural history; Natuurlijke historie. FIG. 72. Metatarsal I of Deinonychus antirrhopus. A) B) probable proximal half of the first metatarsal (\TM 5240) in lateral and posterior views; C) and D) the distal half of metatarsal I (\'PM 5217) in lateral and posterior views. Abbreviations: II—articular contact with metatarsal II; II?—possible scar of articular contact with metatarsal II. have been more probable, however, and thus required a resisting external ligament. A single example (YPM 5240) is available of what I consider to be the proximal end of the first metatarsal (Fig. 72A and B). This bone was found associated with elements of left and right feet and a right manus, but was not in articulation. Its identity must remain in doubt, but it resembles very closely the proximal end of metatarsal I in Allosaiirus as shown by Osborn (1899: Fig. 4a). It is approximately the right size, but is more robust than I would have expected for this element. Like the distal half, this bone is curved slightly, and the proximal end is expanded into an oval, convex, articular surface. The upper part of the shaft is oval in section, striated internally and rugose externally. The latter may mark the site of ligaments which joined this to the upper posterior part of the second metatarsal. Except for this latter feature, there is no scar, facet, or other in- dication of direct contact with metatarsal II. The bone tapers distally, but retains its oval cross section, and terminates quite abruptly in an oblique, convex surface that is slightly rough in texture, perhaps indicative of a cartilaginous extension to the distal half described above. Metatarsals II, III and IV are long and rather stout (Figs. 73 and 75). The third is the longest, although it is only a little longer than IV, and is straight shafted. Both metatarsals II and IV curve away from the median. Please note that these images are extracted from scanned page images that may have been digitally enhanced for re
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