1905-6.] 
Report on Two Crania. 
295 
Cephalic Index . — The length and breadth measurements of the 
three skulls referred to above are the following : — 
Maximum 
Length. 
Maximum 
Breadth. 
Cephalic 
Index. 
Rutland specimen 
188 
138 
73'4 
Aberdeen ,, ... 
195 
150 
76*9 
Brazil , , ... 
183 
142 
77-6 
These figures might lead one to place the Rutland skull, 
which is dolichocephalic, in a different category from the other 
two specimens. Its low cephalic index in comparison with 
the higher mesaticephalic indices of the Aberdeen and Brazil 
skulls is a feature which cannot be ignored. Still, it must be 
remembered that the maximum antero-posterior diameter of the 
cranium is composed of two factors of altogether different moment 
and significance, and in crania with large inflated frontal air-sinuses 
the cephalic index loses much of its importance as a differential 
character. When the depth of the frontal air-sinus is omitted 
from the calculation of the index, the Rutland and Aberdeen 
skulls enter the brachycephalic list, although they are still 
differentiated with some sharpness by this character ; unfortunately, 
in the case of the Brazil specimen, we have not the figures 
necessary for the calculation of the index. 
Maximum 
Length of the 
Brain case. 
Maximum 
Breadth. 
Cephalic 
Index. 
Rutland skull 
172 
138 
80*2 
Aberdeen , , 
178 
150 
84*3 
Projection of the Supraorbital part of the Frontal Bone.— As is 
well known,* the projection in this region may be due to expansion 
* See Logan Turner, Accessory Sinuses of the Nose, Edinburgh, 1901 ; 
also Zuckerkandl, Normale unci Patliologische Anatomie der Nasenhohle und 
ihrer pneumatischen Anhdnge, 1 Bd. 2 Auflage, 1893. 
