SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 
and the more distinct one with the head. These conditions are seen 
clearly in the following table. 
The increase of the measurement with the increase in the breadth 
of the head is due on one hand to the correlation with the latter of 
the breadth of the upper face, which in turn influences the lower 
jaw ; and on the other to .the effect of the broad base of such a skull 
on the condyles and the ascending rami of the lower jaw. Broaden- 
ing of the bigonial diameter independent of these factors is due 
almost entirely to the action of the masseters, which in some instances 
results in a marked eversion of the lower portion of the jaw at the 
angle. 
KHARGA OASIS, MEN: EELATION OF DIAMETER BIGONIAL TO BREADTH 
OF FACE AND BREADTH OF HEAD 
17 narrowest jaws: 
9.7 cm. and below 
14 broadest jaws: 
10.9 cm. and above 
1 
n;, _ Diameter 
-ass* 
Greatest 
breadth 
of head 
Diameter 
bigonial 
Diameter 
bizygomatic 
maximum 
Greatest 
breadth 
of head 
cm. 
cm. 
cm. 
cm. 
cm. 
cm. 
8.9 
12. 1 
13.0 
10.9 
13 5 
14.2 
9.1 
12.6 
14.8 
IO.9 
13.1 
14.4 
9.1 
n.8 
14.0 
10.9 
13.0 
14-5 
9.2 
12.8 
14.7 
10.9 
13-4 
14.4 
9-3 
13.0 
14.0 
II.O 
13-8 
14.2 
9-3 
13.4 
14.2 
II. O 
13-9 
14.4 
9-4 
13.2 
13-9 
II. I 
13.7 
14.2 
9-5 
13-0 
13.3 
II. I 
13-5 
14.4 
9-5 
12.9 
13-4 
II. I 
13-4 
13.7 
9-5 
13-1 
13-9 
II. 2 
13.8 
13-4 
9-6 
12.8 
13-4 
II. 2 
12.6 
13-8 
9.6 
12.9 
13-8 
11.4 
13.6 
13-9 
9-6 
12. 
13.2 
11.8 
13.2 
14.6 
9-7 
12.9 
13.6 
12. 1 
13.6 
14.6 
9-7 
I3-I 
13-6 
9-7 
13-6 
14.2 
9-7 
13-3 
13.6 
Averages : 
9-4 
(89-9-7) 
12.85 
(11.8-13-6) 
13.8 
(13.0-14-8) 
11.2 
(10.9-12.1) 
13.4 
(12.6-13.9) 
14.2 
(13.4-14.6) 
Per cent : 
100 
73.1 
68.1 
100 
83.6 
78-9 
Averages and per cent that would exist if the rela- 
tion of the measurements were the same as in the 
group with narrowest jaws. 
(15-3) 
(87.1) 
(16-4) 
(81.1) 
