466 



THE HOI^. W. ROTHSCHILD ON 



[May 1, 



skull, compressed face, and large size ; the measurements given 

 here explain this : — 



Gorilla gorilla matschiei. 



Sind surface of Head : 



Greatest breadth at the mastoid pro- 

 cesses 170 mm. 



Length of skull from arciis superciliaris 

 to front oi premaxilla 160 mm. 



Fremaxilla across canine alveolae 

 90 mm. 



Width at last molar tooth 67 mm. 



Width outside upper edge of eye 

 145 mm. 



Gorilla gorilla jacobi. 



182 mm. 



138 mm. 



78 mm. 

 70 mm. 



154 mm. 



We thus know at present 5 geographical I'aces of Gorilla as 

 follows : — 



Gorilla gorilla. Gaboon. 



Gorilla gorilla matschiei. South Gamaroons. 



Gorilla gorilla jacobi. West Central Gamaroons. 



Gorilla gorilla diehli. North and Central Gamaroons. 



Gorilla gorilla heringeri. Kirunga, German East Africa. 



I give here three comparative measurements of the 5 races of 

 GoriUa gorilla, which show how very widely the proportions of the 

 skviUs difi'er : — 



It may appear ridiculous to some that the Gorillas of the 

 Gamaroons should be divided into 3 races, but I must re- 

 mind my readers that these large Apes, like the Orangs, probably 

 cannot swim and therefore these races are separated and entirely 

 isolated by the large rivers. I- have in my possession 1 Gorilla 

 gorilla diehli and 4 Gorilla gorilla and skulls of each, and also 

 2 skulls of Gorilla gorilla matschiei. 



Besides much other material of great interest, I have received a 



