424 



THE HON. WALTEE EOTHSCHILD ON [DeC. 1 3, 



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. Simia calvus (Du Chaillu), Proc. Boston Soc. ISTat. Hist. vii. 

 p. 296 (1861). 



Distrihution. Interior of Gaboon Region and Southern 

 Camaroons. 



Distinctive characters. External : hair of head not parted in 

 centi-e, 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 skidl apparently very wide, 

 as it is exjjanded 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 protuhercmtia 

 occipitalis externa is the same vn 6 S and 5 5 , viz. 127-139 mm. 



