. Bulletin. Natural history; Natuurlijke historie. 114 PEABODY MUSEUM BULLETIN 30 A r^ il B. c m FIG. 65. (A) right ischium (YPM 5235) and (B), right pubis (?) (YPM 5236) of Deinonychus antirrhopus, both in lateral view. Abbreviations: af—probable area of origin of the M. adductor femoris; il—iliac articulation; ob—obturator foramen; op—obturator process; pi2—probable origin area of the M. pubo-ischio-femoralis externus, pars 2; pi3—probable origin area of part 3 of the M. pubo-ischio-femoralis externus. externus. It seems unlikely that the M. ambiens attached at this point but this must be co
. Bulletin. Natural history; Natuurlijke historie. 114 PEABODY MUSEUM BULLETIN 30 A r^ il B. c m FIG. 65. (A) right ischium (YPM 5235) and (B), right pubis (?) (YPM 5236) of Deinonychus antirrhopus, both in lateral view. Abbreviations: af—probable area of origin of the M. adductor femoris; il—iliac articulation; ob—obturator foramen; op—obturator process; pi2—probable origin area of the M. pubo-ischio-femoralis externus, pars 2; pi3—probable origin area of part 3 of the M. pubo-ischio-femoralis externus. externus. It seems unlikely that the M. ambiens attached at this point but this must be considered as another possibiHty. A broad, thin plate of bone, deeply concave medially, extends from this "corner" down and forward. The posterior margin is stout and triangular in section, but the anterior margin is very thin. The inferior margin is slightly expanded, rounded and faintly rugose in texture. Any contact along this latter margin with the opposite pubis must have been cartilaginous or ligamentous. A moderate-sized oval foramen is situated just beneath and anterior to the "ischiac peduncle," passing up and inward. A distinct channel extends from the foramen upward across the inner surface to the posterior margin of the "ischiac ; This would appear to be the obturator foramen, although among theropods this feature apparently exists only in Ceratosaurus nasicornis (USNM 4735 and some primitive Triassic forms such as Ornithosuchus. My identification of this element as a right pubis is based on the following: a) The correspondence of its articular expansion to the pubic j>eduncle of the ischium. b) A foramen which corresponds perfectly in location and orientation to an obturator foramen. c) The size is appropriate. d) Although primitive, the shape is not unreasonable. e) It seemingly cannot be equated with any other bone in either theropod or ornithopod (the only two kinds of vertebrates represented in the Yale qu
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