10 DAVID HEPBURN. [No. 2. 



was larger than the left, the individual variation being from 3 

 to 5 mm. and the average variation 4 mm. In the remaining 

 two skulls the left segment was the larger, the variation being 

 1 mm. and 7 mm. and the average 4 mm. Compared with the 

 skulls of Sandwich Islanders these averages are again very 

 similar, but the individual variations were not so marked among 

 the Scandinavian skulls. 



(c) Mesati-cephalic (5). In one of these, the segments were 

 equal but in the other four the right segment predominated. 

 The individual variation extended from 1 mm. to 7 mm., and 

 the average was 4 mm. 



Asterionic Diameter. 



From this diameter we obtain a guide to the width of the 

 cerebellum and, by segmenting it in terms of the external occi- 

 pital crest, to the symmetry of this part of the skull. 



(a) Dolicho-cephalic, — (14). In five cases the right segment 

 was the larger, and in nine the left segment predominated, but 

 in bolh sets the average difference was only 1.8 mm. From 

 this it will be evident that the variations were unimportant, 

 although it may be mentioned that the male skulls showed the 

 greater variation. When compared with the Australian Ab- 

 originals, the averages of difference do not present much dis- 

 parity except as regards four Australian skulls, in which the left 

 segment prevailed to such an extent as to give an average 

 difference of 4 mm. 



(b) Brachy-cephalic, — (5). In two of these the right seg- 

 ment was the greater^ and in three the left prevailed. The 

 average differences in the two groups were 2 mm. and 2.3 mm. 

 respectively, figures which are almost identical with those derived 

 from brachy-cephalic Sandwich Island skulls. 



(c) Mesati-cephalic, — (5). In one of these the segments 

 were equal. In another, the right segment was 2 mm. greater 

 than the left, and in the remaining three, the left segment was 

 the greater, giving an average difference of 4.3 mm. 



