THE BONES 



direction ; in the anthropoid it describes a curve from the upper 

 exterior edge to the lower interior. The basal line of the spine, 

 described from the posterior edge of the scapula to the lower 

 edge of the glenoid cavity, forms with the posterior border : 

 in man a right angle; in the orang an angle of 120. The 

 angle of the scapula in the anthropoids corresponds to their 

 semi-erect position. The articular cavity differs also in form 

 and depth in man and the anthropoids. In the orang it is 

 comparatively deeper and narrower. In man, the surface of 

 the cavity is kidney-shaped, in the orang purse-shaped. In 

 man, the humerus possesses a far greater power of rotatory 



Collection of scapula. (Ranke.) 



FIG. 25. 



FIG. 26. 



FIG. 27. 



FIG. 28. 



FIG. 29. FIG. 30. FIG. 31. 



25. Man. 26. Gorilla. 27. Chimpanzee. 28. Orang. 29. Hylobates. 

 30. Dog. 31. Stag. (Corr.-Blatt f. Anthrop., etc., 1904, 141.) 



motion. In man, the surface of the cavity is nearly parallel 

 with the outer edge of the scapula ; in the anthropoids the 

 angle of inclination is 45 = R. The chief difference between 

 the human scapula and that of the gorilla, which resembles 

 man's more closely than does that of the orang, is that the 

 spine cuts the outer edge at a much lower point in the gorilla 

 than in man. The incisura scapulae is absent in the gorilla as 

 in all the other anthropoids. The chimpanzee has a consider- 

 ably narrower shoulder-blade than has the orang, gorilla, or 

 man, though in outline it shows many points of similarity to 

 the human scapula. It is clear at a glance that the scapula of 

 the hylobates possesses very little human resemblance, as it is 



