of the Rliinolophus philippiuensis Group. 



245 



(1) lu the pkilippinensis section the sagittal crest is low 

 in frontj gently sloping towards the postnasal depression 

 (fig. 1). In the trifoliatus section the crest is high in 

 front, and abruptly descending towards the postnasal 

 depression (fig. 2) : this causes a very different side view 

 o£ the skull. 



,^ 



Ficr. 1 a. 



Fig'. 2 a. 



Fig. 1. Skull of Bh. pkilippinensis, side view. 1 a. The same skull, 

 upper view. 2. Skull of Rh. trifoliatus, side view. 2 a. The same 

 skull, upper view. The specimens figured are of the same age (teeth 

 unworn), -f-. 



In the philij'pinensis section the teeth are smaller, the 

 maxillar width narrower, the coronoid process of the 

 mandible somewhat lower, the temporal fossa narrower^ the 

 zygomatic arches, therefore, very slightly projecting laterally, 

 making the zygomatic width of the skull but very slightly, 

 or not at all, larger than the mastoid width (fig. 1 a) . In the 

 trifoliatus section the teeth are larger, the maxillar width 

 broader ; the stronger teeth involve an increase in size of the 

 temporal muscle, this again a slight heightening of the 

 coronoid process, a considerable widening out of the temporal 



