Archive image from page 98 of The dinosaurs of North America The dinosaurs of North America dinosaursofnort00mars Year: 1896 maksh.] CLAOSAUEUS. 223 margin, above the articulation for the coraeoid, is a strong protuber- ance, with a well-defined facet, adapted to the support of the clavicle, if such a bone were present. The coraeoid is very small, and is per- forated by a large foramen. The two peculiar bones now generally regarded as belonging to the sternum were separate, as shown in PI. LXXY. fig. 4. The humerus is comparatively short, and has a prominent radial crest. The radius and ulna
Archive image from page 98 of The dinosaurs of North America The dinosaurs of North America dinosaursofnort00mars Year: 1896 maksh.] CLAOSAUEUS. 223 margin, above the articulation for the coraeoid, is a strong protuber- ance, with a well-defined facet, adapted to the support of the clavicle, if such a bone were present. The coraeoid is very small, and is per- forated by a large foramen. The two peculiar bones now generally regarded as belonging to the sternum were separate, as shown in PI. LXXY. fig. 4. The humerus is comparatively short, and has a prominent radial crest. The radius and ulna are inuch elongated, the latter being longer than the humerus, and the radius about the same length. The ulna has a prominent olecranon process, and is a stouter bone than the radius. The carpal bones were quite short, and appear to have been only imperfectly ossified. The fore foot, or manus, was very long, and contained three functional digits only. The first digit was rudimentary, the second and third were nearly equal in length, the fourth was shorter and less developed, and the fifth entirely wanting, as shown in PI. LXXIII, fig. 1. In the functional digits (n, in, iv) the phalanges are elongate, thus materially lengthening the fore foot. The terminal phalanges of these digits are broad and fiat, showing that they were covered with hoofs, and not with claws. The limb as a whole was thus adapted to loco- m P;' ~~~' is Fig. 55.—nium of Claosourus aoi! ilarsh; seen from the left. One-sixth natural size a, acetabular border: *'.«. face for ischium; p, face for pubis. motion or support, and not at all for prehension, although this might have been expected from its small size and position. The elongation of the forearm and manus is a peculiar feature, espe- cially when taken in connection with the ungulate phalanges. It may, perhaps, be explained by supposing that the animal gradually assumed a more erect position until it became essentially a biped, while the fore lim
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