302 



PTEROrUS rSF.LAPHON. 



Avidtli externally across m'-rn' ; width of rostrum externally across 

 alveolar borders of p^-p^ subequal to orbital diameter ; front of orbit 

 vertically above posterior half or posterior point of p''. Zygomatic 

 arches unusually flaring posteriorly, owing to wddth of temporal 

 fossa (powerful' temporal muscle). Sagittal crest very strong. 



Fig. 15. — PtewpvK psehphon, 2 ■ Sulphur Island. No. 92.2.4.1. }. 



Postorbital processes of frontals long ; corresponding lower processes 

 (ou zygomatic arches) short even in individuals with worn teeth ; 

 upper and lower processes in aged individuals closely approximated 

 or fused so as to completely encircle the orbit. Mandible extremely 



