104 
FASCICULI MALATENSES 
and 50 in the other ; in No. 26 it is leptoprosopie, being 46*3. The complete 
facial index of No. 25 is also chamaeoprosopic, being 94*3. 
Norma occipitalis . 
The outline of the four skulls is in this view pentagonal. It is in the 
norma occipitalis that the difference between these specimens and the skulls 
from Sai Kau is most apparent, owing to the way in which the ocdpita 
squama bulges out and the nuchal plate, also bulging out but in a different 
curve, retreats gradually towards the foramen magnum. 
Jaws and teeth . 
The palate in No. 25 is of medium diameter, very highly arched above; 
its index is 114*5 : in the other two adult specimens it is broad, their indices 
being 130 and 122*3. As might be expected, in the young it is very broad, 
having an index of 131*2, 
Allowing for differences in age and sex, the four adult lower jaws from 
Nawngchik town are very similar to one another, and are of the same type 
as those described above. 
In the adult specimens the teeth are smaller than those of No. 21* In 
No. 25 the third molar is moderately large on both sides of both jaws, its 
condition in the lower jaw showing that its appearance is quite recent, more so 
than in the upper jaw of the same specimen. A similar condition prevails in 
the male lower jaw, No. 28 ; but in No. 2 6 there is no trace of a third molar 
on either side of the upper jaw, and no room for one in the alveolar border : 
on the left side of the lower jaw a small, but well-formed, wisdom tooth exists 
on the right side. It is, however, so far back in the jaw that if the bone be 
viewed in profile most of it is concealed behind the ascending ramus. In this 
case the suppression of the latest in development of the teeth does not appear 
to be due to the growth of the preceding teeth, which are of no great size, so 
much as to the shortness of the dentary arc itself. This is the only specimen 
in the Malayo-Siamese series in which any teeth appear to have been lost during 
life, and in it only the first molar on the right side seems to have suffered. 
In No. 27 the third molar has been developed on both sides of both 
jaws, being small in the upper jaw but of fair size in the lower. 
Two of the adult female skulls from Nawngchik town are microcephalic, 
the cubic capacity of No. 27 being only 1,215 c * cm *i ami that of No. 26, 
1,310 c.cm. ; the third specimen is mesocephalic, with a capacity of 
1,360 c.cm. 
Taking them as a whole, the Malayo-Siamese crania from the Patani 
