26 ARKIV FÖR ZOOLOGI. BAND M. NIO 4. 



In the fully adult males the muscidi temporales meet on top 

 of the brain case so as to form a conspicuous, although quite 

 low crista sagittalis, while in the old female there is an inter- 

 space of 18 mm between the upper limits of these muscles. 



The total length of the old female skull is only 80,5 mm, 

 the condylobasal length is 76 and the zygomatic breadth 

 50,7 mm. It is thus much smaller than Thomas' speeimen. 



The total length of the male skulls varies between 86,5 

 and 91 mm, the condylobasal length between 82 and 86 mm, 

 the zygomatic breadth between 56 and 59,7 mm (51 only 

 in a young adult male), the breadth of the brain-case between 

 38,5 and 41 mm, the interorbital breadth between 18 and 

 20 mm (17,5 in young adult male). 



The size of the teeth proves to vary in a very consi- 

 derable degree. Thus the combined length of the five upper 

 cheek-teeth amounts 



These measurements indicate that the teeth of P. /• 

 modesius really as a rule are rather small, but the individual 

 variation is great. A closer examination reveals that it is 

 chiefly the molars and the last premolar, which are subjected 

 to variation as well in length as in breadth as the following 

 measurements prove. 



Speeimen d transverse diameter of m' = 5,2 mm 

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