1879.] PROF. A. H. GARROD ON GELADA RUEPPELLI. 453 



culated in the female. This area extends forwards for three and a 

 quarter inches, broad opposite the mons veneris, which is therefore 

 nude, the anterior border being non-caruuculated, and gradually 

 lost in the sparse hair of the abdomen. 



Osteological comparisons between Gelada and its allies are very 

 attractive, but do not lead to very definite results. Those most 

 important in my estimation will be here recorded. 



The following are measurements of the larger bones in the male:— 



Length of humerus y.\ 



„ radius 74 



u > a .'.'.'.'.'. 8-35 



„ femur 7.45 



.. tibia y.Q 



» fibula y.Q 



„ " s <r a P ula •• 525 (extreme)* 



rrom anterior margin of praemaxilla to 



occiput ... 6-5 (5-8 in?) 



Extreme breadth at posterior parts of 



zygomata. 4-1 (4-0 in?) 



Extreme breadth of orbit '9 (same in 9 ) 



Interorbital interval 0-425 (0-35 in ? ). 



There are 13 pairs of ribs, of which 5 are false. The sacrum 

 consists ot three vertebrae. The clavicles form a single curve • and 

 the anterior margin of the manubrium sterni is not much thickened 



My opportunities for examining the skulls of adult specimens of 

 Monkeys being but few, it is impossible to generalize to any extent 

 with safety. Cercopithecus differs from Macacus and Cynocephalus 

 in not possessing a fifth lobe to its mandibular third molar In 

 Gelada this extra lobe is large, as is the anterior talon on the maxil- 

 lary molars which are small in Cynocephalus, and much smaller 

 still in the Macaques I have examined. In Gelada the upper in- 

 cisors are at right angles to the alveolar margins of the premaxillary 

 which is the case in Macacus ; in Cynocephalus and Cercopithecus 

 they converge as they descend. 



The profile view of the Gelada's skull exhibits the great anterior 

 development of the sharp median portion of the supraorbital ridge 

 and the deep concavity of the nasal contour. In Gelada, Cerco- 

 pithecus, and Cynocephalus the nasal bones are separate, elongate 

 and narrow, appearing superficially upon the skull as high as the 

 supraorbital frontal ridge. In Macacus they fuse, and form a 

 short broad triangle whose apex does not reach the frontal bone, the 

 maxillanes meeting above it. 



In Gelada there is no trace of any groove or foramen for the 

 supraorbital vessels and nerve. This is also the case in Cerco- 

 pithecus. In Macacus and Cynocephalus, however, the groove is 

 very deep, almost forming a foramen. The malar foramen is also 

 wanting m Gelada. Its presence in allied genera is uncertain. There 

 is a foramen in the fronto-malar suture. 



