. Bulletin. Natural history; Natuurlijke historie. FIG. 57. Comparison of the left humeri of several theropods as seen in medial view (anterior is to the right). All are drawn to unit scale to emphasize relative robustness and dimensions of the deltopectoral aest and the internal tuberosity. All vertical lines = 10 cm. A) Coelophysis longicollis (AMNH 7224), (right humerus reversed); B) Allosaurus fragilis? (YPM 1894); C) Coelurus agilis (YPM 2010); D) Deinonychus antirrhopus (AMNH 3015); E) Ornithomimus altus (AMNH 5201), (right humerus reversed); F) Gorgosauriis libratus (NMC 2110), (right h
. Bulletin. Natural history; Natuurlijke historie. FIG. 57. Comparison of the left humeri of several theropods as seen in medial view (anterior is to the right). All are drawn to unit scale to emphasize relative robustness and dimensions of the deltopectoral aest and the internal tuberosity. All vertical lines = 10 cm. A) Coelophysis longicollis (AMNH 7224), (right humerus reversed); B) Allosaurus fragilis? (YPM 1894); C) Coelurus agilis (YPM 2010); D) Deinonychus antirrhopus (AMNH 3015); E) Ornithomimus altus (AMNH 5201), (right humerus reversed); F) Gorgosauriis libratus (NMC 2110), (right humerus reversed); G) Tyrannosaurus rex (AMNH 972), (right humerus reversed). larger form, but its axis of elongation is at some 30^ to that of the ulnar condyle and is nearly parallel to the plane of the deltopectoral crest. The significance of these two parallelisms is not known. The greatest width of the distal end (across the two condyles) coincides with the greatest dimension of the head and is nearly perpendicular to the plane of the deltopectoral crest. The ectepicondyle is represented by a faint ridge at the external anterior border of the radial condyle. The entepicondyle, on the other hand, exists as a small, but conspicuous knob medial and slightly above the antero-internal limit of the ulnar condyle (Figs. 55B and 56A). This feature is clearly separated from the articular capsule and is far more prominent than in any other theropod with which I am familiar. It seems reasonable to equate the greater than usual prominence of the entepicondyle with a relative increase in the power and importance of the flexors of the carpus and hand. ULNA The radius and ulna are well represented in the American Museum and Peabody Museum collections. Both left and right elements are nearly complete in AMNH 3015. The left radius and ulna and a partial right radius are preserved in YPM 5206, the complete left radius and ulna and right ulna are present in YPM 5220, and a nearly complete lef
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