568).

In the same paper it is stated that the number of dorsal vertebrae in man is normally twelve, very rarely thirteen.

In the Chimpanzee there are normally thirteen dorsal vertebrae, but occasionally there are fourteen or only twelve.
_Variations in the Skull._ [Illustration: FIG.

14 .-- Variation of Skull of Wolf.

10 specimens.] Among the nine adult male Orang-utans, collected by myself in Borneo, the skulls differed remarkably in size and proportions.