PlfACOCHCERUS. 365 



specimina utriusque scxus retulit, nullum vero Suis cefJiiopicl ibi 

 vidit:'—(Efi'ersl(/t K. V. Ahtd. Fork. 1846, p. 121. 



I cannot discover any difference between the skull which we re- 

 ceived from Professor Sundcvall as P. JEUani from Caffraria and the 

 skulls without cutting-teeth which were obtained from Mr. Argent, 

 which are called P. (Pthiopiciis. 



There is no difference, as far as I can see, except size, between the 

 very large skull of a male from Cape Verde, that was given to the 

 Museum by Mr. T. Tatum, and the skulls from South Africa and Caf- 

 fraria in the Museum collection, and the skull figured by Dr. Riip- 

 pell as the tj'pe of his F. ^iani. 



It is said that P. (ethioj^inis, without upper cutting-teeth, has a 

 soft sac under the eyes, which is not to be observed in P. africamts, 

 that has cutting-teeth in the upper jaw. Perhaps this may be a 

 sexual character ; for it was a male P. (ethiopicus that was first de- 

 scribed, with a large mane of slight bristles. 



The teeth in the lower jaw are generally well developed and large. 

 There is one skull in tlie British Museum, from Mr. Argent, in which 

 they are nearly worn away to the roots ; they are small. This skull 

 has no upper incisors. De BlainviUe figures a lower jaw in which 

 they are entirely absent, and another in which there are only two 

 very small teeth (Osteogr. Sits, t. 5, Sus ccthioplciis). 



It has been proposed to divide Phacochcerus into two species, thus 

 characterized : — 



P. cethiopicus. Head short ; forehead convex ; cutting-teeth none 

 above, and small and deciduous below. 



P. ^Uani. Head elongate ; forehead convex ; cutting-teeth two 

 in upper, six in lower jaw, l)oth large and exserted. 



I cannot find any difference in the form of the head and forehead 

 between the specimens with and without cutting-teeth in the upper 

 jaw. The head is as long and the forehead is as concave in the 

 skulls that are destitute of upper cutting-teeth as in those that have 

 them well developed. 



There is a considerable variation in the skulls. The slmll of the 

 male from the Zoological Gardens is much broader, and the forehead 

 more concave, than the skulls of the females from the same collection ; 

 but these are from animals that have been kept in confinement. 

 The teeth of the old male are greatl)' deformed, the grinders being 

 absent on one side of the upper and on the opposite side of the lower 

 jaw, the teeth working into cavities in the alveolar surface. The nose 

 of the skuU below the base of the canines is much broader and more 

 rounded and arched in the males than in the females. The upper 

 canine teeth are nearly of the same form in the two sexes ; those of 

 the males are much the thickest. 



The skull from Cape Verde is longer in proportion to its width 

 than any of the other skulls, the line along the upper surface of 

 the skull being full three times the length of the width between 

 the upper edges of the orbits. In other skuUs it is twice and a half, 

 or rather more than twice and a half, the width at the same part of 

 the skull. I cannot see any other character to separate it. 



2 A 2 



