Description of a new craniometer and of certain age changes in the anthropoid skull / by Arthur Keith.

  • Arthur Keith
Date:
[1910]
Catalogue details

Licence: In copyright

Credit: Description of a new craniometer and of certain age changes in the anthropoid skull / by Arthur Keith. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    all its diameters, and that this reduction affects the vertical diameter in particular—yet the data cannot be held to j~)rove the contention, owing to the limited nnmlier of specimens at my disposal. The animals from 1-7 are immature; those numbered from 8-14 are mature, but only three of them can be described as aged. The mean of the vertical diameter is I’5 mm. less in the older than in the younger group, while the reduction in the a.p. diameter is proportionately less, viz. 2T mm.; the reduction in the transverse diameter is markedly less. Summary. This paper deals with : (1) the description of a craniometer which gives definite recoi'ds of the position of both the internal and external points in the skull; (2) descriptions are given of four skulls—that of a Bushman, of a peculiar skull from Johanna Island off Madagascar, of an orang and of a chimpanzee skull; (3) the following age changes in the anthropoid skull are described ; (a) the ascent and expansion of the temporal ridges ; (h) the expansion of the nuchal ridge (occipito-nia,stoid curved lines); (c) the posterior migration of the basion, occipital condyles, and opisthion.
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