. The Ceratopsia. Ceratopsia. 90 THE CEEATOPSIA. The posterior crest is somewhat saddle-shaped. Its sides are wavy, with a slight thickening of the bone in the posterior five of the seven corresponding convexities of the periphery, while a pair of inwardly directed spurs of bone, with their points turned slightly downward, are developed on its posterior border, one on each side of the median line. The intervacuital element is thickened along its median length and a more decided strengthening of the bone occurs along the posterior border, resembling in this respect the corresponding part of Mon
. The Ceratopsia. Ceratopsia. 90 THE CEEATOPSIA. The posterior crest is somewhat saddle-shaped. Its sides are wavy, with a slight thickening of the bone in the posterior five of the seven corresponding convexities of the periphery, while a pair of inwardly directed spurs of bone, with their points turned slightly downward, are developed on its posterior border, one on each side of the median line. The intervacuital element is thickened along its median length and a more decided strengthening of the bone occurs along the posterior border, resembling in this respect the corresponding part of Monodonius belli, described farther on. In all other parts of the crest the bone is thin, more particularly near and at the margin of the fontanelles, whilst along the sinuous curves of the sides the edge is sharp, except in the emarginations, where it is rounded. Vascular markings occur on both surfaces, more particularly on the peripheral projections. Measurements. Mm. Height of orbit - - - .' 0. 110 Width of orbit - - - - - - - - - - - .095 Height of horn core . 331 Circumference at base of horn core . 343 Antero-posterior diameter of base of same 135 Transverse diameter of base of same „.. 092 Diameter of occipital condyle. 060 Length of maxilla, approximate. 350 Height of same, approximate 120 Long diameter of lower face of quadrate 080 Short diameter of lower face of quadrate _ 036 The skull and the posterior crest were collected on Red Deer River in 1901. With this species are provisionally associated a scapula and coracoid, a sacrum, an ilium, a rostral bone, and a predentary bone, described or referred to in the next succeeding pages. The scapula with coracoid is figured on PI. XIX, fig. 4 [PI. XX, fig. 1], viewed from its inner side. The scapula is long and narrow, slightly concave inward in the direc- tion of its length, stout below, thin- ning rapidly upward, upper end ter- minating squarely, breadth decreas- ing toward mid-length, slightly ex- panded above, front ma
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