140 PROCEEDINGS OP THE ANATOMICAL AND ANTHROPOLOGICAL 



corresponding point behind ; this is especially so in the case of the 

 Whitestone skull, the occipital pole being poorly developed. 



Fig. 5. Tracing of skull from Whitestone 

 short cist (\). 



Fig. 6. Tracing of skull from Blackhills 

 short cist (|). 



The face in both skulls is low and broad, and the orbits are 

 distinctly microacme. In the Whitestone skull the nasal aperture 

 is rather broad, the index being mesorhine, while in the Blackhills 

 skull the index is leptorhine. 



Lower Jaw. Both lower jaws show characteristic thickening of 

 the alveolar process inside the molar teeth in the region of the 

 internal oblique line. This thickening is most developed in the case 

 of the Whitestone skull, the lower jaw at the level of the second 

 molar tooth being 19 mm. in thickness. This thickening is largely 

 due to an overhanging ledge, on the inner side of the alveolar 

 process of the jaw, for the support of the two last molar teeth. 



Teeth. The teeth in both upper and lower jaw of the Whitestone 

 skull are beautifully preserved. The molar teeth have large, well- 

 formed crowns. The second and third upper molars have each three 

 cusps. The crown of the third molar or " wisdom " tooth is as large 

 and well developed as that of the second molar. The combined 

 length of the three upper molar teeth on each side is 29 mm., and 

 the combined length of the upper molars and premolars is 43. Com- 

 paring this with the basi-nasal length, we obtain a dental in<l<>x of 

 43 (Flower). Thus as regards the teeth the skull is mesodont, the 

 crowns of the molar and premolar teeth being relatively larger than 

 in the modern Scottish skull. 



