Fig. 24 in Long-Legged Pursuit Carnivorans (Amphicyonidae, Daphoeninae) From The Early Miocene Of North America

Fig. 24. Comparison of the carpus (anterior view) of Borocyon robustum and those of Panthera leo, Canis lupus, and Ursus arctos. See text for discussion. 1, Elevated bony ridge on scapholunar forcing ulnar deviation of the forepaw during flexion of the wrist; 2, scapholunar process inserted in concavity of magnum preventing hyperextension within the carpus (this stop mechanism is maximally developed in the cheetah). Abbreviations: a, scapholunar; b, carpal cuneiform; c, unciform; d, magnum; e, trapezoid; f, trapezium.