CHAP. V] THE CRANIA OF THE SIMIIDAE (PRIMATES) 213 



Palate : General contour. 



Post-palatine spine. 

 Tuber maxillare. 

 Palatine sutures. 



III. The Temporal Fossa: 



Sutures at pterion. 

 Depth of fossa. 

 Post-orbital wall. 



IV. Base of the skull : Glenoid fossa. 



Endoglenoid tubercle. 

 Margin of foramen magnum. 

 Styloid process. 



V. Dentition : Number of teeth. 



Characters of teeth. 



VI. Mandible. 



CRANIAL CHARACTERS OF HYLOBATES MULLERI. 



As is to be expected from the smaller size of the animal, the skull (Fig. 144) 

 is much less bulky than that of the Gorilla (or indeed of the other Simiidae) : 

 in length the brain-case (cranium) will he found to measure about 75 mm., 



Spheno-pariefal 



articulation 



Lacryrno-ethmoidal 

 articulation 



Pig. 144. Cranium (with mandible) of Hylobates mulleri : note the absence of 

 an auditory bulla; there are sphenoparietal and lachrymo-etbnioidal articulations. 

 Note also the number of the teeth. (Hose donation II; Mus. Anat. Cant.) 



whereas in the larger animals of this family twice that figure would represent 

 the corresponding dimension. 



In size and in general appearance the skull resembles those of the higher 

 Cercopithecidae rather than those of the Simiidae. By way of distinction 



