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Show 466 THE HON. W, ROTHSCHILD ON [May 1 skull, compressed face, and large size; the measurements given here explain this :- G o r il l a g o r il l a m a t s c h ie i . Hind surface o f Head: Greatest breadth at the mastoid processes 170 mm. Length of skull from arcus superciliaris to front of premaxilla 160 mm. Premaxilla across canine alveolae 90 mm. Width at last molar tooth 67 mm. Width outside upper edge of eye 145 mm. G o r il l a g o r il l a j a c o b i . 182 mm, 138 mm. 78 mm. 70 mm. 154 mm. We thus know at present 5 geographical races of Gorilla as follows :- Gorilla gorilla. Gaboon. Gorilla gorilla matschiei. South Camaroons. Gorilla gorilla jacobi. West Central Camaroons. Gorilla gorilla diehli. North and Central Camaroons. Gorilla gorilla beringeri. 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 skulls differ :- Hind surface o f Head. Greatest width. From centre of Crista lambdoidea to anterior edge of Foramen magnum. Length of skull from Arcus superciliaris to end of Premaxilla. Gorilla gorilla 166 mm. 136 mm. 174 mm. Gorilla gorilla dielili 178 mm. 115 mm. 144 mm. Gorilla gorilla beringeri 145 mm. 105 mm. 134 mm. Gorilla gorilla jacobi 182 mm. 138 mm. Gorilla gorilla matschiei 177 mm. 140 mm. 160 mm. It may appear ridiculous to some that the Gorillas of the Camaroons should be divided into 3 races, but I must remind 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 dielili 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 |