Cranial Characters, &c., of the Snow-Leopard. 311 
In the sum total of its characters the skull of F. uncia 
differs considerably from the skulls of F’. leo, tigris, pardus, 
and onca ; but, as stated above, the most marked differences 
are found in the occipital region, which does not appear to 
have been previously described in /. uncia. 
In F’. leo, tigris, pardus, and onca the foramen magnum is 
wider than high, its inferior edge is comparatively thin, the 
width between the inner edges of the condyles is equal to 
A. Right tympanic bulla of Uneia uncia seen obliquely from behind, 
showing the narrow valley (v) between the bulla and the elenoid 
ridge of the squamosal and the line of origin of the partition ( p). 
B. The same of Panthera onca, 
the width of the foramen, there is no deep depression, 
deepening in front, up against the bulle on the basioccipital, 
aud there is a comparatively wide valley between the bullie 
and the glenoid ridge of the squamosal (fig. 2B, v). Finally, 
the partition of the bulla is low, rises tolerably close to the 
auditory meatus, the line of its origin running from a point 
just in front of the stylomastoid foramen to a point on the 
anterior face of the bulla (fig. 2 B, y) ; and when the bulla 
