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Show 424 THE HON. WALTER ROTHSCHILD ON [Dec. 13, Text-fig. 107. Skull of Simia satyrus Linn. (Fere adult.) 134-142 mm. and in the $ 5 122-130 mm. The thinnest place in the zygomatic arch is 5-9 mm. high (always over 7 mm. in old 6 6 ) . 2. S im ia calvus (D u Chaillu), Proc. Boston Soc. Nat. Hist. vii. p. 296 (1861). Distribution. Interior of Gaboon Region and Southern Camaroons. Distinctive characters. External: hair of head not parted in centre, falls out when adult to behind base of ears ; the ears are enormous, 80 x 53 mm. at least. Beard laterally thin and longer than in S. satyrus, and does not join under the chin. Chin sparsely covered with white hairs. Length of arms in adult animals 600 mm. Colour of face in adult animals brownish black ; eyes light brown, in young animals wood-brown, ears yellowish. Cranial characters : facial portion of skull apparently very wide, as it is expanded behind the canines. The greatest width at the canines is 5 mm. narrower than at the molars. The brain-case is round, the greatest length from the glabella to the protuberantia occipitalis externa is the same in 3 3 and 5 $ , viz. 127-139 mm. |