1910-11.] Anatomy of the Head of the Australian Aboriginal. 621 
whole number is given, and if the decimal be a ’5 then the lower whole 
number is recorded. 
As regards the glabella-inion length, both Australians are within the 
Tasmanian range of variation ; but in both instances they are well above 
the Tasmanian average, which is in accordance with modern research on 
the subject of the relative lengths of the crania of these two peoples. 
In breadth the Australian male is greater than the greatest breadth for 
any Tasmanian, whilst the female almost exactly coincides with the average 
Tasmanian breadth. 
In view of the great morphological significance of Schwalbe’s bregmatic 
angle it is of exceptional interest to note that, whilst both Australians are 
within the Tasmanian range, they are both well above the Tasmanian 
average ; the same remarks applying to another equally important mor- 
phological observation, namely, the angle of frontal curvature. 
The length of the chord of the pars glabellaris of the os frontale is, in 
the Australians, very striking. In both male and female this length is 
considerably greater than the corresponding maximum figure in the 
Tasmanian. Whilst the length of the chord of the pars glabellaris cannot 
express anything more than the linear area occupied by the glabellar part 
of the frontal bone on the total length of the os frontale, it is somewhat 
remarkable that this area should be so much greater in the Australian than 
in the Tasmanian, for the latter is as ancient a race as the Australian and 
probably more so. The question of the evolution of the glabellar and 
cerebral portions of the os frontale is, however, far too complicated and 
intricate a one to be entered upon here ; but it must not be forgotten that 
Cunningham (52) has thrown much light upon this problem, and that Cross 
(53) has practically proved that of all Schwalbe’s observational methods of 
examining the calvaria those which have to do with the glabellar portion 
of the os frontale are of least value. 
For both the length of the parietal arc and the parietal frontal arc 
index the female Australian is within the Tasmanian range of variation 
but the male is, in each instance, just beyond the Tasmanian maximum. 
This implies that in this individual the parietal segment of his skull has 
attained a relatively greater degree of development in proportion to the 
frontal arc than in any Tasmanian. 
The Surfaces of the Sections. 
In the illustrations which accompany this work there are displayed the 
surfaces of the sections of the male Australian aboriginal head number one. 
