166 



THE GENERAL ANATOMY OF GORILLA 



[sect, a 



Fronfo-squjmous 

 arhculahon 



Lacryma 

 bone "Ft 



Long auditory 

 passage 



Psrmanent- teeth 



Fig. 105. Cranium, with mandible, of a young Gorilla (Simiidae) ; the first tooth 

 of the permanent set has appeared (permanent molar tooth). Note the compara- 

 tively large brain-case. There is no auditory bulla : the auditory passage is long, but 

 not so long as in adults : there are fronto-squamous and fronto-maxillary articulations. 

 Osseous ridges and crests are still undeveloped {\ nat. size). 



Fronto-squamou s 

 articulation . 



Fronto-maxillary 

 articulation 



Lacrymal bone -- 



Fig. 106. Cranium, with mandible, of an adult Gorilla (Simiidae) : note the 

 absence of an auditory bulla, the presence of great bony crests, and of fronto- 

 squamous and fronto-maxillary articulations (the latter within the orbit in place of 

 a lachrymo-ethmoidal junction). The canine teeth are enormously developed in the 

 male sex {\ nat. size). 



