LECTURE VII. 



175 



most projecting vim of the occiput. The basilar bone is long 

 and narrow, but the mastoid processes, as well as the petrous 

 bone, are generally strong and thick, the brims of the occipital 

 foramen rise above the flattened base. The facial skull is re- 

 markably large iu proportion to the cerebral skull. 



Fig. 63. KaSii- Skull, base. 



The orbits are wide, funnel-shaped, their lower margin very 

 thick, rounded and projecting, the nasal bones short, narrow, 

 almost square, the nasal apertures broad, with rounded angles, 

 the nasal spine is scarcely indicated, the upper jaws drawn 

 outward, usually provided with knobs corresponding to the 

 canine teeth, the cheekbones usually form prominent angles. 

 According to Pruner-Bey, we may distinguish three kinds of 

 prognathism. In the lowest degree the alveolar arch is elliptic 

 instead of parabolic, outwardly convex, but the incisors are 

 perpendicularly inserted, so that the prognathism is confined 

 to this jaw. In the second degree the incisors are oblique, 

 but are in the same -line with the jaw ; whilst in the third de- 

 gree they form an obtuse angle at their insertion and exhibit 



