ニホンザルの発育II. : 頭骨の形態的変化II.

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1) In a previous paper, I have classified the cranial characters of the Japanese macaque into three categories based on the difference in the rate of change in post-natal development, and have described the characters of "type a" which reveal remarkable changes. The present paper deals with the characters of "type b" and "type c". 2) Changes in the characters of "type b" are considerable but less conspicuous than those in "type a". Type b characters are associated with the attachment of musculature as are those of "type a". The skull elongates anteriorly owing mainly to protrusion of the facial part of the skull, and this brings about differences of the growth ratio of different parts. Most of characters in the posterior part of the skull are of "type b". 3) The characters belonging to "type c" are confined to the bones of the braincase. They do not change their sizes through the post-natal development, and this fact seems to suggest that the brain remains almost unchanged in volume during the periods. 4) The macaque from Is. Yakushima is identified by Kuroda as a separate subspecies Macaca fuscata yakui KURODA from M.F. fuscata (BLYTH). Many skulls of Yakushima macaques were examined in the present work, but no cranial character was found to distinguish the macaque from the typical Japanese macaque on the taxonomic stand point. The only exception is an existence of crista sagittaris in two specimens among many skulls of Yakushima macaque examined.
1960-10-15

ニホンザルの発育II. : 頭骨の形態的変化II.

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