THE VARIETIES OF THE HUMAN SPECIES. 29 



protuberances forward this narrowing-, which forms the two sym- 

 metrical sides, is maintained ahnost at the same level as the cranial 

 arch, the level from the parietal protuberances to the occiput 

 becomes oblique and descends to form the angle of the pentagon. 



Fig. 3.— Pentagonoides. 



This obliquity is very evident when seen from the norma verti- 

 calis (Fig. 4). • 



Fig. 4.— Pentagonoides. 



The variations which the pentagonal norma verticalis may pre- 

 sent are as follows: 



