PLATE CCX 



Left Trapezoid and Left Magnum of the Type of Brontops robustus Marsh 



Plate prepared under the direction of Professor Marsh. One-half natural size. (See p. 668) 



1, Left trapezoid, anterior view; 2, the same, medial or inner view (radial side); 3, the same, posterior view; 4, the same, lateral 

 or outer view (ulnar side); 5, the same, proximal end; 6, the same, distal end. m, m', Facets for articulation with magnum; 

 mcll, facet for articulation with second metacarpal; s, facet for articulation with scaphoid. 



7, Left magnum, anterior view; 8, the same, medial or inner view (radial side) ; 9, the same, posterior view; 10, the same, lateral 

 or outer view (ulnar side); 11, the same, proximal view; 12, the same, distal view. I, Facet for articulation with lunar; 

 mcII, facet for articulation with second metacarpal; mcIII, facet for articulation with third metacarpal; mcIV, facet for 

 articulation with fourth metacarpal; s, facet for articulation with scaphoid; id, td' , facets for articulation with trapezoid; wn, 

 facet for articulation with unciform. 



The principal ligamentous and muscular attachments of these elements are given on page 716. 



