1905.] SCANDINAVIAN CRANIA. 9 



showed the right segment to be the larger in three cases, with 

 a variation from 7 to 14 mm., giving an average of 9.3 mm. 

 In one skull the segments were equal. 



This steady preponderance of the right segment over the 

 left in the Stephanie region is capable of three explanations. 

 First, one temporal muscle may come higher up on the side of 

 the skull than the other, although this is rather doubtful, since 

 there is no very evident reason why such an arrangement should 

 occur. Second, the bregma, from vvhich the measurement was 

 made, may itself be deflected to one or other side of the true 

 mesial plane, and in the majority of cases may lie to the left of 

 this imaginary plane. As a matter of fact I believe that this is 

 very often the case, and that the sagittal suture is usually oblique. 



Third, the asymmetry of the bregma would be accounted 

 for either by variability in the rate of ossification of the two 

 parietal bones, or else as the result of different rates of growth 

 of the frontal lobes of the cerebrum. 



Maximum Parieto-squamous Breadth. 



This diameter expresses the width of the cerebrum more 

 especially in the region of the parietal lobe, and the bregma was 

 again selected as the point upon which to determine the relative 

 sizes of the right and left segments, for the sake of enabling 

 comparisons to be made with the frontal region. 



(a) Dolicho-cephalic (14). In ten skulls the right segment 

 was the greater, the variations being from 1 to 6 mm., while 

 the average variation was 3.3 mm. The other four skulls had 

 the left segment larger than the right, the variation being from 

 1 to 5 mm., and the average variation 2.5 mm. A comparison 

 of these figures with those obtained from the Australian Ab- 

 originals shows that in the latter, the averages of variation 

 were very much the same as in the Scandinavian skulls with 

 this difference that the sides upon which the averages occurred 

 were exactly reversed. 



(b) Brachy-cephalic (5). In three of these the right segment 



