No. 521] 



SAUBOPOD DINOSAURS 



275 



competent American investigators, the articulating sur- 

 face of the humerus did thus move in the scapula, and the 

 great projection on the outer side of the proximal end of 

 the humerus, showing every evidence of having been pro- 

 vided with enormous muscular attachments, gave the ani- 

 mal the power to move the limb in the direction indicated, 

 this projection being strictly analogous in function to the 

 great trochanter of the humerus as it exists in the mam- 

 malia to-day. The statement that the downward pro- 



jecting angle of the coracoid at its union with the scapula 

 to form an acetabulum for the humerus precluded back- 

 ward and forward motion in a perpendicular plane, as 

 Tornier avers, is not borne out by an examination of the 

 skeleton in situ. The humerus was capable of thus 

 moving through a very long arc. 



Professor Tornier utterly ignores in his discussion a 

 very important point, and that is, the structure of the 

 ribs of the Diplodocus as compared with the structure 



