1882.] PROF. ST.-GEORGE MIVART ON THE ZLUROIDEA. 467 
may have a somewhat larger aperture, as in the Herpestine and 
Proteles; or the septum may be represented only by two osseous 
ridges tending to divide off a small anterior chamber in each bulla, 
as in Hyena. 
The two chambers of the bulla may be placed, one rather internally 
and the other externally, as in the Felide and Herpestine; or one 
behind the other, as in the Viverring. If placed one internally and 
one externally, the more posterior (which does not contain the 
auditory ossicles) may be placed the more internally, as in the 
Felide, or the more externally, as in the Herpestine. The external 
chamber may be not merely placed the more externally, but may 
be posteriorly and strikingly everted outwards, as in the Herpestine. 
The bulla may narrow much anteriorly, as in Paradorurus. Its 
anterior chamber may be hardly bullate, as in Cynogale, or very 
decidedly so, as in Genet/a and Herpestes. 
The external auditory meatus is generally very short, but may be 
prolonged, as in Suricata and Hyena. Its posterior margin may 
project the more, as in most Viverrine, or its anterior margin, as in 
most Herpestine, or its inferior part, as in Hemigalea. 
The floor of the meatus may be imperfectly ossified, as in Suricata 
(where there is a longitudinal fissure) and in Herpestes (where there is 
a foramen). Instead of a fissure or foramen there may be a deep 
groove, as in the Galidictine. 
The external aperture of the auditory meatus may be large and 
rounded, as in Felis; or oval, as in many Viverrine ; or small and 
triangular, as in Herpestes and Suricata. 
There may be a very deep pit (to receive the hyoidean cornu) on 
the outer side of the bulla, just below the external auditory opening, 
as in Arctictis. 
The mastoid may be prominent, as in Felis, Hyena, and Suricata ; 
or not at all so, as in most Viverrine. 
The paroccipital process may not depend below the bull or may 
be very slightly prominent, as in Felis. It may depend below the 
adjacent part of the bulla as a distinct process, as in Viverra civetta 
and most Viverrine; or it may not do so at all, as in the Her- 
pestine. 
Sagittal and lambdoidal ridges may be greatly developed, as in 
the large Cats, and especially in the Hyznas ; or they may be almost 
evanescent, as in Hupleres, where also the zygomata are very slender. 
The occipital region may be very exceptionally prominent in the 
middle, as in Lupleres. 
The mesopterygoid fossa may be to the cranial length at 100 
as 23°9 (as sometimes in Felis), or only as 11°] (as sometimes in 
Herpestes). 
The average breadth of the palate compared with its length in the 
Felid@ is as 80°2 to 100. It may be only 32-5, as in Eupleres, or 
83°8, as in Cynogale. It is 62°5 in Genetta, and 51°3 in Viverra 
civetta. It is 87-4 in Crocuta. In Suricata it is 65°6. 
An alisphenoid canal may be present, as always in the Viverring 
(except generally in Viverricula) and in the Herpestine (save in 
