XVII GORILLA AND CHIMPANZEE 573 
however, so marked as in Man, and the phrase “Ex pede 
Herculem ” has been aptly supplemented by “ Ex calce hominem.” 
The hair upon the head forms a kind of crest, which can be 
elevated when the animal is enraged. The neck is thick and 
short, and the beast has massive shoulders and a broad chest. 
If it were not for the fewness of the Anthropoid Apes, and 
their nearness to Man, it is doubtful whether the Gorilla would 
be ranked as a distinct genus,’ for in internal structure it is 
Fic. 274.—Gorilla. Gorilla gorilla, 9. x - 
very near the Chimpanzee. The microscopic character of the 
investigations into the anatomy of Man have somewhat dimmed 
the proper sense of perspective, and have tended to throw into 
greater prominence than seems necessary the divergences of 
structure seen in the Gorilla. Dr. Keith? has recently summed 
up and commented upon these divergences, and the following 
account of this Anthropoid is mainly deduced from his memoir. 
The cranial capacity of the Gorilla is greater than that 
of the Chimpanzee. It is not possible, however, to decide from 
this point of view whether a given skull is that of one or of the 
other of these Apes. Some Chimpanzees are higher in capacity 
1 Tt is not so ranked by everybody. 2 Proc. Zool. Soc. 1899, p. 296. 
