SLM DA 735 
may extend to the axilla. The ears are relatively small. The 
skull is of an elongated or dolichocephalic type; that of the adult 
male being characterised by the enormous development of the 
supraorbital ridges, which form a kind of penthouse over the eyes, 
and contribute to the peculiarly ferocious appearance of the animal. 
The sagittal crest is also very large. The canine teeth of the male 
are very large, and are inclined outwards in both jaws. In the 
Fic. 356.—The Gorilla (Gorilla savagei). From Trans. Zool. Soc. vol. iv. pl. 43. 
cheek-teeth the upper premolars are of considerable antero-posterior 
extent, with their outer border placed in the same line as that of 
the molars; and the third upper molar is larger than either of the 
others. : 
The posterior cervical vertebre are characterised by the great 
height of their neural spines, which thus form a strong basis for 
the powerful cervical muscles supporting the massive skull. In 
some instances the fourth lumbar vertebra becomes ankylosed to 
the sacrum, as is occasionally found to be the case in some of the 
lower human races. 
In the absence of a centrale to the carpus, and also in the 
