152 ' PAP 10 



orbits only slightly broader than widest part of rostrum; occipital 

 region beneath, pyramidal, not rounded posteriorly; no sagittal crest, 

 but ridges are continued from outer side of orbits, and meet on the 

 interparietal ; zygomatic arches not widely spread ; pterygoid fossa long 

 and narrow ; palatal arch rounded ; palate widest anteriorly ; tooth 

 rows straight; canines heavy, broad and rather short; molar teeth 

 larger than in P. sphinx. 



This skull differs from that of the Mandrill in many particulars, 

 the rostral region is much longer and wider ; the central ridge is flatter, 

 being below the top of the lateral ones for their entire length ; narial 

 opening broader and shorter; nasals broader anteriorly; central part 

 of orbital ridges not depressed, making the orbits rounder; braincase 

 broader and more rounded posteriorly and on a level with the orbital 

 ridge, and rising gradually to occiput which is considerably higher than 

 orbital ridge, while the braincase of P. sphinx curves downward to 

 the occiput which lies lower than the orbital ridge, and in the superior 

 outline of the braincase these skulls are totally unlike; bony palate 

 not so contracted posteriorly; basioccipital more abruptly descending 

 to pterygoid fossa ; tooth rows much longer ; occipital region much 

 more slanting than that of P. sphinx which is nearly perpendicular. 

 The second upper molar is much larger, and the second lower molar 

 smaller, than the corresponding teeth of the species compared. It will 

 be seen from the above that the skulls of the two species are quite 

 different in nearly all respects. 



Measurements. Skull : total length, 228 ; occipito-nasal length, 

 185 ; Hensel, 169 ; zygomatic width, 124.9 ; intertemporal width, 61 ; 

 length of rostrum, 122; breadth of rostrum, 71.17; length of rostral 

 ridges, 83; greatest width of orbits, 72; greatest width of braincase, 

 79 ; median length of nasals, 89 ; palatal length, 107.3 ; length of upper 

 canines, 32.5 ; length of upper molar series, 55.9 ; length of mandible, 

 167 ; length of lower molar series, 78. 



Papio leucoph^us (F. Cuvier). 



? Simia {Papio) cinereus Kerr, Anim. Kingd., 1792, p. 62; Allen, 

 Bull. Amer. Mus. Nat. Hist., N. Y., VII, 1895, p. 185. 



Simia leucophaa F. Cuv., Ann. Mus. Hist. Nat. Paris, IX, 1807, 

 p. 477 ; Fisch., Syn. Mamm., 1829, p. 37. 



Cynocephalus leucopheus F. Cuv., Hist. Nat. Mamm., Livr. IV, 

 1807, p. 637; 2nd ed., 1833, pp. 135, 142, pis. XLVIII, XLIX, 

 L and LI ; Desm., Mamm., 1820, p. 71 ; E. Geoff., Cours Hist. 



