644 THE HIGHER ANTHROPOIDS 



Measurements and Indices of the Gorilla 



Total length of the skull 230 nun. 



Occipito-iiasal length 135 mm. 



Intertemporal \\ idth g8 . i mm. 



Breadth of the brain ease 92 mm. 



The dimensions of the brain are: 



Longitudinal 123 mm. 



Transverse. ? 8~ mm. 



Tile average weight of the l:)rain in the lull-grow ti adult enelosed m the 

 dura mater and pia mater is 450 gms., without the dma mater, 445 gms. 



Hie following weight and water displacement \-alues were obtained 

 from the measurement ol the adult female gorilla. Number 4, ol tlu' Akeley 

 African expedition nl 1021. 



Volume ol the brain : 



Forebram 364 c.c. 



Midbrain 5 c.c. 



Hindl)rain 60 c.c. 



Total water displacement 429 c.c. 



W eight ol the brain: 



Forebrain 359 g'HS- 



Midbrain 5 gms. 



Hindbrain 5() . 5 Ji'i^s. 



Total weight 4-3 5 g'^s. 



On the basis of tlii'se liguri's, enet'|)halie nidices wcmx' cornpuli'cl : 



lorebrain index 84 per cent 



Midbrain index 2 per cent 



Hindbrain index 14 per cent 



