



558 



with an unusually large outlet in the dental canal, beneath the fourth 

 premolar. Hunterian. 



3352. The right inferior canine of a young, and probably female, Babyroussa. 



Mm. Brit. 



Genus Phacochcerus. 



3353. The skull of the North African Wart-hog (Pkacochcerus jEliani}. 



The fronto-parietal region is broad and flat, except transversely, where it is rendered con- 

 cave by the orbits being raised above its level : those cavities are placed farther back than in 

 the other Suidce. The paroccipital processes are long and slender. The mnstoids are com- 

 pressed and pointed, and are much less developed than in the Wild Boar, the Masked Boar, 

 or the Babyroussa. The pterygoid fossae are simple ; not divided into an external and internal 

 compartment, as in the Babyroussa, but they are more extended backwards. The sockets of 

 the canines have not the process from the upper part, as in the Sits larcatus. The maxillo-pre- 

 maxillary suture is obliterated, except at the apex of the premaxillaries which extend beyond 

 the sockets of the tusks. The upper incisors are here further reduced than in the Baby- 

 roussa, viz. to 1 1 in the upper jaw : the incisors are retained in normal number, 3 3, in 

 the lower jaw. The first true molar, m 1, is worn down to its stumps, but is retained on the 

 right side. The last premolar, p 4, and the socket of the penultimate one, p 3, are present 

 on both sides of the upper jaw. In the lower jaw the first true molar, m 1, has been shed on 

 both sides and its socket absorbed, so that the last premolar, p 4, has come into contact with 

 the second true molar, m 2. There is no trace of a socket of any other of the molar series. 



Mus. Brookes. 



3354. The skull of a Phacochcerus ^Eliani. 



In this the first true molar, m 1, has been shed in both jaws, but an interval is still pre- 

 served, in which some trace of its socket may be discerned between the last premolar, p 4, 

 and the second true molar, m 2. The penultimate premolars, p 3, are preserved in the upper 

 jaw ; they have been shed, or not developed, hi the lower one. 



Hunterian. 



3355. The skull of a Phacochcerus ^Eliani, wanting the inferior tusks, and the cra- 

 nium much mutilated. 



This serves to show the extent of the pterygoid sinus on the left side, and also the great 

 posterior extension of the supracranial sinuses. The rhinencephalic fossa is large and well- 

 defined. This skull is the original from which the figure was taken which forms the subject 

 of Tab. xviii., 'Philosophical Transactions' for 1799, in illustration of Home's paper, en- 

 titled " Some Observations on the Structure of the Teeth of Graminivorous Quadrupeds, 

 particularly those of the Elephant and Sus ^Ethiopians." Only the large and complex third 

 molars, m 3, remain in the upper jaw ; the trace of the socket of the second molar, m 2, is 



