1898.] 



AN ANTHROPOID APE. 



993 



The features more specially observed were : — the total facial 

 length and the part contributed to it by the upper lip ; the inter- 

 orbital and biorbital diameters, and the dimensions of the ears. 

 Of these dimensions I have constructed indices (Tab. II.) ; and a 

 comparison of the members of this group as arranged in the 

 numerical order of the indices is here presented (Tab. III.). 



Index 1. Height of upper lip X 100 



Distance supra-orb. crest to lip-margin' 

 Index 2. Interorbital diameter X 100 

 External biorbital diameter' 



Thus arranged, it is to be observed that the Chimpanzee-like or 

 " intermediate " apes keep on the whole fairly closely together and 

 away from the genuine Gorillas that I have been able to measure — 

 the Chimpanzees furnishing the higher, and the Gorillas the lower 

 terms of the series in the case of each index. 



In these respects, too, the position of " A " is evidently rather 

 with the Chimpanzees than with the Gorillas. 



In the last table (Tab. IV.) I have presented some other 



Table IV. 



