. Bulletin - United States National Museum. Science. OSTEOLOGY OF CAENIVOEOUS DINOSAURS. 65 Plate 13. The pelvis of Antrodemus comprises the ilium, ischium, and pubis. These articulate to form the acetabulum. In very old individuals these bones are some- times found coossified, especially the ilium and pubis, a condition that also obtains in certain members of the Sauropoda. The most striking featm-e of the pelvis is the union of the distal ends of the pubes to form a triangular foot-like end, on which it is thought the animal rested its weight when assuming a squatting postm-e. nium (il.).âIn
. Bulletin - United States National Museum. Science. OSTEOLOGY OF CAENIVOEOUS DINOSAURS. 65 Plate 13. The pelvis of Antrodemus comprises the ilium, ischium, and pubis. These articulate to form the acetabulum. In very old individuals these bones are some- times found coossified, especially the ilium and pubis, a condition that also obtains in certain members of the Sauropoda. The most striking featm-e of the pelvis is the union of the distal ends of the pubes to form a triangular foot-like end, on which it is thought the animal rested its weight when assuming a squatting postm-e. nium (il.).âIn general form the ilium resembles that of other members of the Theropoda. In the present skeleton the right ilium was found attached to the sacrum. The left ilium was detached but not far removed from the sacrum and the other pelvic elements, and is the most perfect of the pair. In figure 2, plate 10, is sho\\Ti a lateral view of the left ilium which for the first time gives the correct contour of the anterior end. Upon investi- gation it is found that all of the figures previously pub- lished of tliis bone are in- correct. The greatest dis- crepancy observed is in the contom* of the anterior end, compare figure 2, plate 10, with figure 46, for instead of having a convex border from above downward, it presents an irregular but truncated end, resembling somewhat the ilium of Tyrannosaurus. In the Dinosaurs of North America (pis. 10 and 11) Marsh figures the left side of the pelvis of this same individual, but since the left ilium was only recently removed from its sandstone bed it is to be inferred that the reversed figure of the right was used in making*the illustration. A recent examination of this bone shows that the anterior border is incomplete, though it is not so indicated in the figures, and this fact will account for the inaccuracy of previously published illustrations, one of which is shown in figure 46. The ilium has the same elongate form, with a general contour sim
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