608 Proceedings of Royal Society of Edinburgh. [sess. 
(b) Dolichocephali. — In one case the segments were equal; in 
four cases the right segment was in excess, giving an average 
variation of 2 '2 mm.; in seven cases the left segment predomi- 
nated, with an average excess of 3 ‘5 mm. 
(c) Anthropoids. — In two cases the right side predominated, 
and in two cases the left. 
In this region of the skull, asymmetry was also a noteworthy 
feature, and in its proportions it was very much more pronounced 
among the brachycephalic skulls. It appears to be quite excep- 
tional to have the asymmetry confined to the same side of the skull 
throughout the series of transverse diameters, although in certain 
skulls this condition may prevail. 
Asterionic Diameter. — (a) Brachycephali. — Bearing in mind the 
variable nature of the points which are the extreme ends of this 
diameter, it is surprising that four of the skulls indicated equality 
between the right and left segments. In other four, the excess was 
in the right segment, with a variation from 1-3 mm., and an average 
excess of 2 mm. In the remaining three cases, the excess belonged 
to the left segment, and also varied from 1-3 mm., with an aver- 
age of 2 mm. 
(b) Dolichocephali. — In three cases the right and left seg- 
ments were equal; in five, the right segment held an average 
excess of 1*6 mm. ; and in four, the left held an average excess of 
4 mm. 
(c) Anthropoids. — In all four the excess lay with the right 
segment. 
Of the twenty-three measurements made in this region on the 
two groups of human skulls, nine gave the excess to the right side, 
seven to the left side, and seven were neutral. This result, taken 
in conjunction with the small averages of the variations, and the 
variable character of the sutures which determine the asterionic 
point, scarcely warrants any deduction concerning the value of 
the asymmetry in this region, although, as the asterionic diameter 
suggests approximately the width of the cerebellum, it is perhaps 
not to be wondered at, that there should be so much uniformity 
between the right and left halves of the occipital region of the 
skull. 
Basi-bregmatic Height. — (a) Brachycephali. — In this group of 
