310 Mr. R. I. Pocock on the Tooth-change, 
inferior border, and the condyles are everted, so that the 
distance between their inner edges exceeds the width of the 
foramen. The bulle are separated by a very narrow valley 
from the vertical glenoid ridge of the squamosal (fig. 2 A, v), 
the groove on the bulla marking the line of the partition 
passes from the styloid to a point behind the basioccipital 
suture on the inner side and lies a long way below the 
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6S 
« 
Aili 
Base of skull of Uncia uncia with bulla of right side (left of figure) cut 
open to show the inner chamber and the partition (p) separating 
it from the outer or auditory chamber. On the left bulla p 
marks the groove showing the line of origin of the partition, 
Depressions on basioccipital also shown, 
auditory meatus (figs. 1, 2, y). Thus the auditory chamber 
is comparatively very large and antero-internally passes in 
front of the extremity of the posterior chamber (fig. 4 C), 
the cavity of which is still further reduced by the convex 
bulging of the partition (fig. 1, p). 
In the mandible the chin is nearly vertical in its anterior 
two-thirds and sharply curved backwards inferiorly. 
