. Bulletin of the British Museum (Natural History), Geology. AFRICAN PLIO-PLEISTOCENE 53 shaft is again very stout, and is marked by strong ligamentous tubercles at the proxi- mal end. The dorsum is flat, and the angulation between it and the sides of the shaft is sharp. The fourth metatarsal is represented by eight fragments, four of each side (KNM- OG 7493,1494,1495,1496,1497,1498,1499,1500). Most are rather badly damaged, but one has the shaft complete as far as the distal epiphysis. The shaft is stout, and marked with extraordinarily strong ligamentous impres- sions. None is sufficiently i
. Bulletin of the British Museum (Natural History), Geology. AFRICAN PLIO-PLEISTOCENE 53 shaft is again very stout, and is marked by strong ligamentous tubercles at the proxi- mal end. The dorsum is flat, and the angulation between it and the sides of the shaft is sharp. The fourth metatarsal is represented by eight fragments, four of each side (KNM- OG 7493,1494,1495,1496,1497,1498,1499,1500). Most are rather badly damaged, but one has the shaft complete as far as the distal epiphysis. The shaft is stout, and marked with extraordinarily strong ligamentous impres- sions. None is sufficiently intact to permit the depth and breadth of the proximal articular surface to be measured accurately, but this was obviously again very narrow and deep. The arrangement of articular facets on the proximal extremity is as in other cercopithecoids. Four specimens of the fifth metatarsal are included in the collection, two from each side (KNM-OG 1489, 1490, 1491, 1492). All consist of proximal extremities, one (of the right side) with the whole of the shaft and part of the head. The shaft shows moderate medial compression and some medial convexity, but both conditions are less developed than in Theropithecus gelada. The shaft is short and stout, also unlike Theropithecus gelada in which it is slender, specially relative to those of the other metatarsals. The facet for the fourth metatarsal is as in other monkeys. The tubercle on the lateral side of the base (for the insertion of M. peroneus brevis) is very massive and. Fig. 13. Third right metartarsal and phalanges, to scale. Left to right: Theropithecus gelada male (UPHE); T. oswaldi mariae, Olorgesailie (composite); Papio anubis (AMNH 82906) male; Mandrillus sphinx (AMNH 89364) male. Cercocebus atys 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
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