{parks] new species OF TRACHODONT DINOSAUR 55 



Measurements of Scapula 



mm. 



Total length 793 



Maximum width of blade - 190 



Minimum width of blade 120 



Maximum width at articular end (oblique) 210 



Thickness from external ridge to inner face 108 



Scapular portion of glenoid cavity, length 130 



Scapular portion of glenoid cavity, width 60 



Articulation for coracoid, length 80 



Articulation for coracoid, width 60 



The coracoid (Figs. 4 and 5) is a roughly triangular bone with the 

 apex situated antero-inferiorly. The anterior part is moderately 

 thick and sharply inflected outwards about one inch a little above 

 midheight. The articular portion is greatly expanded. The outer 

 face is generally convex but with a sharp concavity infero-proximally 

 owing to the great expansion at the margin of the glenoid cavity. 

 The interior face is slightly concave. The surface for articulation 

 with the scapula is evenly and strongly convex; it is not roughened for 

 suturai union, and the bone was entirely separated from the scapula 

 when removed from the matrix. This articular convexity is separated 

 from the concave articular surface of the glenoid cavity by a deep 

 foraminal notch. The foramen was evidently not closed as in other 

 trachodonts. The structure of this region resembles that of Campto- 

 saurus and Iguanodon^. 



Measurements of Coracoid 



mm. 



Antero-inferior point to upper edge of scapular articulation 200 



Edge of glenoid facette to highest point of anterior margin 115 



Width of scapular facette parallel to foraminal notch 80 



The same at right angles to the notch 65 



Maximum width of glenoid facette parallel to foraminal notch .... 95 



Maximum width of same at right angles to notch 78 



The humerus (Figs. 6 and 7) is a stout bone with a slight twist, 

 prominent radial crest, rounded head with inner and outer tuber- 

 osities, and inner and outer condyles distally. The radial crest ex- 

 tends more than half way down the bone and is continuous with the 

 outer tuberosity which is sharply deflected backward and separated 

 from the head, on the outer aspect of the bone, by a pronounced con- 

 cavity. In the figure the crest may be somewhat too rounded, as the 



1 Osteology of the Jurassic Reptile Camptosaurus, Gilmore. Proc, U. S. Nat. 

 Mus., Vol. XXXVI, April, 1909 



