. Bulletin of the British Museum (Natural History), Geology. AFRICAN PLIO-PLEISTOCENE 91 tures. If so, then the rather more obHque meatus of the Swartkrans and Olduvai II skulls might indicate that the trends towards vertical rami and forwardly located temporal muscles had advanced less far in these earlier forms. The evidence is tenuous, however, and needs to be supported by more complete skulls and mandibles from the sites concerned. Although the height of its cheek-tooth crowns and orientation of the temporal musculature superficially recall the leaf-monkeys, there is no doubt that these. P

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. Bulletin of the British Museum (Natural History), Geology. AFRICAN PLIO-PLEISTOCENE 91 tures. If so, then the rather more obHque meatus of the Swartkrans and Olduvai II skulls might indicate that the trends towards vertical rami and forwardly located temporal muscles had advanced less far in these earlier forms. The evidence is tenuous, however, and needs to be supported by more complete skulls and mandibles from the sites concerned. Although the height of its cheek-tooth crowns and orientation of the temporal musculature superficially recall the leaf-monkeys, there is no doubt that these. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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