THE FORK I.IMH AND FOOT 



53 



The sternals of 67. naskonius, according to Brown,"'' 1 consist "of two broad flat plates, each plate 

 having a thick external border and a thin internal border for articulation with its mate. The anterior 

 end is thickened on the external border for articulation with the process of the coracoid, while the 

 distal end is thick and shows on the ventral surface indentures for the attachment of the cartilaginous 

 ribs." These indentures are not recognizable in the Yale specimen. "The dorsal surface of each 

 plate is flat and the ventral surface is marked by a low ridge that extends from the proximal to the 

 distal end near the outer border. There was probably no intermediate cartilaginous element." 



Length 



Greatest width 



Proximal end 

 Distal end .... 



67. flexus 

 No. 2015 Y.P.M. 

 left right 



318 mm. 354 nun 



129 

 159 



Dimensions of Sternals 



C. nasicornus 

 No. 5351 

 A.M.N.H. 



330 mm. 



107 

 140 



110 

 160 



67. cutleri 



No. 5427 

 A.M.N.H. 



450 mm. 



110 

 180 



ratofs 

 No. 97 1 

 A.M.N.H. 



580 mm. 



220 

 (at middle) 



Y.P.M. 2015 



Fro. 21. — Left humerus of Monoclones (Cen/rosaurus) flexus. A, external view; B, internal view; 1/6 natural size. 

 d, deltoid ridge; h, head; r, radial crest; re, radial condyle; tic, ulnar condyle. 



Humerus 



(Fig. 21) 



Both humeri in the Yale specimen are comparatively well preserved, with little restoration, 

 though the right one is somewhat distorted by crushing. The left humerus agrees essentially with 



25 Brown, B., 1917, p. 292. 



