GENERAL REVIEW OF THE SKULL. 61 
so in @/uropus). Auditory bulla depressed. Orbits 
small, and incomplete posteriorly. Paroccipital pro- 
cess prominent. Condylar foramen exposed. Ex- 
cepting in .4:/uropus, there is an ali-sphenoid canal. 
2. Procyonide. Facial portion of the skull 
usually short and broad, cranium high and com- 
pressed. Zygomatic arches strong. Coronoid process 
of mandible strongly developed. 
3. Mustellidz. Cranium elongated and narrow 
in many genera. The post-glenoid process is often 
produced over the deep glenoid fossa (e.g. Je/es), and 
fits lightly over the condyle of the mandible. No ali- 
sphenoid canal. Dentition variable ; in Latar there 
are but two incisors in each side of the lower jaw, thus 
differing from all other Carnivora. The paroccipital 
process of the ex-occipital usually distinct from the 
bulla, triangular in shape, and directed outwards, 
downwards, and backwards. 
Sub-order 11 PINNIPEDIA. 
The families of this sub-order are: 1. Otariide; 
2. Trichechidz#; 3. Phocide. They are all aquatic, 
and differ from the rest of the Carnivora in the modi- 
fication of the limbs for progression in water. The 
cranial characters have been tabulated by Mivart as 
follows : | : 
“1. No complete septum in the auditory bulla of 
any genus. 
2. The lip of the meatus auditorius externus pro- 
