. The Ceratopsia. Ceratopsia. Fig. 85.âA, External view of right humerus of Monortcmius crassus Cope, No. 3998, American Museum of Natural History: B, posterior view of same, h, Head: d, deltoid ridge. One-eighth natural size. section throughout most of its length, becoming somewhat triangular toward its distal extremity. It is directed downward and backward, but distally it curves inward and slightly forward in such manner as to bring the inner surface of the extremities of the ischia in contact for a con- siderable distance. It is evident, however, that the union between the ischia was only
. The Ceratopsia. Ceratopsia. Fig. 85.âA, External view of right humerus of Monortcmius crassus Cope, No. 3998, American Museum of Natural History: B, posterior view of same, h, Head: d, deltoid ridge. One-eighth natural size. section throughout most of its length, becoming somewhat triangular toward its distal extremity. It is directed downward and backward, but distally it curves inward and slightly forward in such manner as to bring the inner surface of the extremities of the ischia in contact for a con- siderable distance. It is evident, however, that the union between the ischia was only cartilaginous. In" fig. 83 there is given a side view of this imperfect ischium. Unfortunately the draftsman has made no attempt to eliminate the distortion in the bone due to crushing. â The scapula.âThere is a right scapula and cora- coid, nearly complete, which may be referred to the present genus and species. The glenoid cavity is almost exactly bisected by the scap- ulo-coracoid suture, though from foreshortening this does not appear to be the case in the accompanying figure (fig. 84). The external surface of these bones is regularly but gently convex longitudinally; the inner surface is concave. The anterior margin of the coracoid is convex, with the inferior angle produced into an acute angular process, bent backward and inward. Between this process and the lower border of the glenoid cavity there is a deep notch or emargination of the inferior or posterior border of the coracoid. The external open- ing of the foramen is midway be- tween the anterior and posterior borders of the coracoid and directly opposite the point where the coraco-scapular suture joins the surface of the glenoid cavity. In- ternally the foramen opens at the coraco-scapular suture. In gen- eral the external surface of the coracoid is regularly convex, while the internal is concave. The scap- ula is comparatively stout and heavy toward its lower extremity, but thin, flat, and somewhat expanded
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