60 

 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 plate XIX., fig. 4, viewed from its inner 

 side. 



The scapiila is long and narrow, slightly concave inward in the direction of its 

 length, stout below, thinning rapidly upward, upper end terminating squarely, breadth 

 decreasing toward mid-length, slightly expanded above, front margin thin, back 

 margin broad below, narrowing to its mid-length then continuing thin upward. A 

 rounded ridge extends upward, on the outer surface, diagonally across from the upper 

 end of the glenoid cavity to the front margin continuing as a decided thickening of the 

 front margin above. 



The coracoid is broader than high, emarginated below the glenoid cavity and 

 produced backward below, lower border turned inward, inner surface decidedly concave, 

 back border at emargiuation thick, border elsewhere rather thin, rounded. Foramen 

 traversing thickness of upper part, directed obliquely downward and outward, with an 

 enlarged outer opening. A small foramen occurs, below the glenoid cavity, in the 

 emargiuation of the posterior border. Glenoid cavity higher than broad, its cur^'e form- 

 ing almost a semicircle. 



^t> 



In the specimen figured, the coracoid was probably firmly united with the scapula, 

 the suture between them, extending from the mid-height of the glenoid cavity forward, 

 being only slightly indicated. The union of the two bones may be regarded as an evi- 

 dence of age in the individual. 



■'3^ 



The left scapula and coracoid fi'om the Red Deer river district, so similar, in most 

 respects, to that of Triceratnps prorszis, Marsh, as figured in the Sixteenth Report of the 

 United States Geological Survey, differs in one important particular, viz., in having the 

 lower border of the coracoid turned inward instead of outward. 



Meas^irements of scapula and coracoid. 



M. 



Scapula with coracoid (left). Cat. No. 506. 



Extreme length of scapula with coracoid in line with back edge of shaft '879 



Length of scapula -711 



Length across glenoid cavity ■ 150 



Length of glenoid cavity, along curve • 204 



Breadth of glenoid cavity at suture between scapula and coracoid "078 



Breadth of glenoid cavity near either end -096 



Breadth of scapula at junction with coracoid ; inner surface • 175 



Breadth of scapula at junction with coracoid ; outer surface • 149 



Breadth of scapula at upper end of glenoid cavity ■ 238 



Breadth of scapula at mid-length ■ 113 



Breadth of scapula at upper end • 184 



Breadth of coracoid at lower end of glenoid cavity . . • 223 



Thickness of scapula at upper end near front border • 025 



Thickness on base of ridge above upper end of glenoid cavity • 060 



