66 BULLETIN OF THE ESSEX INSTITUTE. 



the plane of the glenoid fossa about 40 mm. or nearly 

 twice as far as it does in the right clavicle. The coracoid 

 processes are approximately the same in both specimens, 

 except perhaps that that of the left is a trifle more massive. 

 The superior third of the subscapular fossa of the right 

 bone is decidedly more concave than the left, so much so 

 that the supraspinous portion turns sharply forward at 

 an angle of about 45 degrees. 



There remains to be noted the character of the inferior 

 borders with their angles. Without attempting to give 

 the degree of the angle with accuracy, for that is well 

 nigh impossible, I may say it is evidently under 35°, which 

 is about the minimum average for man. But the interest- 

 ing point to note is the fact that the axillary and inferior 

 vertebral borders are nearly straight and form an angle 

 with approximately straight sides, so that there is little 

 difference in this respect from the orang's scapula. 



When we consider the measurements of the two bones 

 singularly there is no apparent difference between them, 

 80 they may both be given together. The measurements 

 are as follows : — 



Breadth 102 mm. 



Length 145 



Infraspinous length 116 



From the first two measurements, there is obtained the 

 scapular index, which in this case is 70.3. This is consid- 

 erably higher than the average in Europeans, which is 

 about 65. It agrees pretty nearly, however, with the 

 index given by Flower and Garson for Australians and 

 other inferior races, and corresponds to the figure given 

 by Broca for the gorilla. Perhaps of still greater interest 

 is the infraspinous index. Here, according to Dwight, 

 the lowest of the gorilla and chimpanzee exceeds the 



