. Bulletin of the British Museum (Natural History), Geology. . Fig. 9. Dioptrographic drawings. Right lateral aspects. among the Balangodese, but its size is variable in Vedda crania. It is lacking in those specimens that have orygmocraspedotj^ The alveolar borders of the palates of the Balangoda series are more greatly divergent than those of the Vedda series although both series may be described as having the parabolic and elliptical palatal conforma- tion. In size and depth the palates of the fossil series attain the higher values (Text-figs. 8, 9). The Mandible. The Mandibular Index of the
. Bulletin of the British Museum (Natural History), Geology. . Fig. 9. Dioptrographic drawings. Right lateral aspects. among the Balangodese, but its size is variable in Vedda crania. It is lacking in those specimens that have orygmocraspedotj^ The alveolar borders of the palates of the Balangoda series are more greatly divergent than those of the Vedda series although both series may be described as having the parabolic and elliptical palatal conforma- tion. In size and depth the palates of the fossil series attain the higher values (Text-figs. 8, 9). The Mandible. The Mandibular Index of the lower jaws of Veddas falls within the dolichostenomandibular category with an average Index of 8o-ii. This is within the range represented by the fossil series. The mean Fronto-Gonial Index of the Vedda series is 97-11, and the two indices available for the Balangodese fall on either side of this value. The average Zygo-Gonial Index for the Veddas—135-79—is considerably higher than that obtained for the Balangodese, and this reflects the greater bizygomatic diameter of the latter population. A comparison of the gross sizes of the mandibles in the two series shows close similarity, but those of the Balangodese are marked with greater muscularity and an increase in the thickness of the corpus, particularly in the symphysial region. The chin is prominent among the latter : Veddas have moderate^ developed mental protuberances. In both series the chins are most commonly of the median type. Genial tubercles are feebly developed in the Vedda mandibles, and not all Balangodese mandibles have prominent genial tubercles, viz. BP2/i7i and BP3127-34. The digastric fossae, which are prominent in some Vedda specimens, are variable in development in the fossil series. In both series the corpus tapers posteriorly from the symphysis, thus giving a gracile appearance to this portion of the jaw. The exception to this is the Balangodese male, BP2/i7i whose corpus is massive through- out its l
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