50 



THE CERATOPSIA 



and is composed of 46 vertebrae including the minute terminal centrum. 23 of the anterior caudals 

 bear transverse processes. The centra and spines of the caudal series decrease in size uniformly 

 from the last sacral vertebra down to the 45th. The 46th apparently does not have a spine. The 

 centra of the last 12 caudals are proportionately longer than high, slightly cupped on the anterior 

 end with a corresponding ball on the posterior end and the spines of these last 12 vertebrae are like- 

 wise elongated anteroposteriorly. The spines in the caudal series are in height equal to the length 

 of the corresponding chevrons." 20 



APPENDICULAR SKELETON 



CORACOID 



(Fig. 19) 



Both coracoids are present, the left being somewhat crushed so that the transverse diameter is 

 lessened and the bone is more concave than normally. In the Yale specimen the coracoids are not 

 fused with the scapulae as they would be in an older individual such as the Monoclonius crassus type 



FlG- 19 —External view of right scapula and coracoid of Monoclonius (Cen/rosaurus) fiexus, 1/6 natural size, c, coracoid; 



cf, coracoid foramen; g, glenoid fossa; s, scapula. 



20 Brown, B., 1917, p. 289. 



