HEADS IN PROFILE 381 
temporal muscle and is known as the temporal fossa. 
In this area the coronal suture descends between the 
frontal and parietal bones until it ends in a transverse 
line or suture which separates the sphenoid — the part of 
that bone known as the " great wing " — from the frontal 
and parietal bones. It will be further noted that the 
suture between the angular process and malar is con- 
tinued backwards between frontal bone and malar. In 
the English skull the trend of the fronto-malar suture 
is backwards and upwards. In the anthropoid skull, 
however, the fronto-malar suture descends almost verti- 
cally (see fig. 138, A). The vertical position of this 
suture tells us at once that the angular process is in the 
anthropoid position, and therefore lies some distance above 
brain level. A very slight degree of the anthropoid con- 
dition is present in the Gibraltar skull (fig. 137, A) and to 
a considerable degree in Pithecanthropus (fig. 90). What 
is the condition in the Piltdown skull ? There can be 
no doubt about this point ; the sutures necessary for a 
solution of the question are present (fig. 138). The 
fronto-malar suture, shorter than ever seen in a human 
skull hitherto, is truly horizontal in direction. As viewed 
in the actual specimen, its trend is backwards with a 
tendency to ascend. We may be certain, then, that 
when we select the external angular process of the 
frontal as marking the lowest level of the frontal lobes 
we are using a base line which will give us reliable 
results. 
We have evidence from another source which tells us 
we are proceeding on a safe basis. The external angular 
process holds a definite relationship to an important part 
of the frontal lobe, that part known as the third or 
inferior frontal convolution, which is generally regarded as 
directly connected with the acquisition and use of speech. 
The chief speech-centre is supposed to be represented 
in that convolution. The third frontal convolution lies 
directly behind the angular process ; in many heads a 
distinct elevation or "bump" marks the position of this 
important area of the brain. The inferior frontal con- 
