Abstract
An anthropological study was undertaken on the physical traits of human deciduous teeth from corpses of Yayoi age excavated from Hirota site. Results were summarized as follows. 1. As one of the characteristics for deciduous teeth, these teeth retained the primitive traits remarkably well, but the traits themselves did not differ significantly from those of today's teeth. 2. The cusps of the upper 1st deciduous molar were shown to be in the process of differentiation just as they are in the same teeth of modern age, but the whole aspect of the cusps was considerably different from that of the modern teeth. 3. Judging from ethnological viewpoint, all the traits of the corpses from Hirota site somewhat differed from those of the modern Japanese, and may be designated to occupy an intermediate position between the Mongoloid and Caucasian. This was also almost true with the physical traits of the permanent teeth from Hirota Yayoi corpses.
