ne 
ON GELADA RUEPPELLI. 507 
inches 
Length of humerus ..............-. 71 
a radiu8 .-....-. ee ye ae 
% pines ec belies pees a SS 
= femur. nix Gheusenk fre = 7°45 
= Sabie G5 tis oh es antewleeades 76 
‘ Ptabe se sis hkls Fis ite etre Liane ve 7-0 
= scapula....... hb a mateo x . 525 (extreme) 
From anterior margin of premaxila to 
occiput ou cede es crc ce case neendee 6°5 (5°8 in 2 } 
Extreme breadth at Be parts of 
BY POUR she ss iid ee leew _ 41 (40 in 2) 
Extreme breadth of orbit ph Ss Mevileduin 0:9 (same in 2 ) 
Interorbital interval .-.....-.2.2+... 0425 (035 in 2) 
. There are 13 pairs of ribs, of which 5 are false. The sacrum con- 
sists of three vertebre. 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 Macaeus 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 maxillary 
~ molars, which are small in Cynocephalus, and much smaller still in the 
Macaques I have examined. In Gelada the upper incisors-are at right 
angles to the alveolar margins of the premaxNlary, which is the case 
in Macacus ; in Cynocephalus and Cercopitheeus they con¥erge 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, Cercopithecus, 
and Cynocephalus the nasal bones afte 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 maxillaries meeting 
above it. 
In Gelada there is no trace of any groove or foramen for the supra- 
orbital vessels and nerve. This is also the case in Cercopithecus. In 
Macacus and Cynocephalus, however, the groove is very deep, almost 
forming a foramen. The malar foramen is also wanting in Gelada. 
Its presence in allied genera is uncertain. There is a foramen in the 
fronto-malar suture. 
In Macacus and Cynocephalus the anterior palatine foramina opens Page 454. 
into an osseous depression, which is continued for some distance for- 
