EINAR LÖNNBERG, THE GENUS POTAMOCHCERUS. 13 



boar as in the aduit female, but the great size' of the skulls 

 themselves indicate that they have nothing to do with P. 

 porcus uhangensis. If the skull of the boar (fig. 1) is laid 

 by the side of a boar skull from the Cameroons the former, 

 the presumed P. p. albifrons, has a much flatter frontal 

 region and a greater interorbital breadth (conf. table of 

 measurements I). The nasal region is broader than in P. 

 p. pictus. The posterior part of the preorbital region of the 

 skull appears to be broader than in any other race of the 

 genus Poimnochcerus. The lateral callosities of the snout 



1. Skull of an old boar ot" Potamochcierus porcus sul 

 Lower Congo. 



are strongly developed and raised above the nasal surface 

 and at the same time they meet and anchylose in this old 

 specimen with the apop hyses above the canines (fig. 1) which 

 appear to be sonaewhat higher but more slender than in 

 P. p. pictus. Even if younger specimens of the latter are 

 chosen for comparison their apophyses exhibit a broader 

 lateral surface, that is, their anteroposterior diameter is much 

 longer than in the Congo boar. This diameter below the 

 callosities measures in the latter specimen only 24 mm. but 

 in an old boar from Cameroons 38 mm. and in a younger 

 36 mm. The greatest zygomatic width in the Congo boar 

 skull is not in front as in old boars from Cameroons. 



■*■ The skull of the boar is unfortunately chopped of in the occipital 

 region but in spite of this mutilation it measures fully 360 mm., and 

 probably it has been at least 20 mm. langer- 



