328 Mr. R. I. Pocock on the Auditory Bulla 
the line of the partition runs from the stylomastoid foramen 
obliquely inwards and forwards across the summit of the 
inverted bulla and ceases at the occipito-sphenoidal suture. 
The partition, which is almost vertical, divides the bulla 
into two approximately equal chambers, of which the outer, 
or auditory, occupies the whole of the anterior portion of 
Felis manul. (Tibet.) 
A. Base of skull, from below, with inner chamber of right bulla laid open. 
B. Right bulla of same, from inner side. 
C. The same bulla, from outer side. 
p-, partition ; x., periotic; p.’, line of origin of partition. 
the bulla, the inner or posterior chamber ceasing in front 
at the occipito-sphenoidal suture, where it is compressed to 
form an acutely angular corner. J. manul, indeed, sur- 
passes Uncia uncia in the enlargement of the outer at the 
expense of the inner chamber, since in Uncia the line of 
origin of the partition does not reach the summit of the 
