14 



ARKIV FÖR ZOOLOGI. BD 7. N:0 6. 



In the female skull as well the interorbital and nasal re- 

 gions are mucli broader than in a specimen from Cameroons 

 of the same sex. 



In one respect the female skull from Lower Congo shows 

 a very striking anomaly as it has duplicate canines in the 

 upper jaw on both sides (conf. fig. 2). Such a duplication 



appears to be very rare as Bate- 

 SON does not mention anything 

 similar from Siiidce in his »Mate- 

 rials for the study of Variation. »^ 

 From the description above 

 of these skulls and the table of 

 measurement it is apparent that 

 the Bush Pig of Lower Congo is 

 quite different from the other 

 races of P. porcus,^ and if future 

 investigations should prova that 

 it is not the same as albifrons 

 Du Chaillu i will call it P. p. 

 congicus as it deserves a name 

 of its own, and I take the boar 

 skull presented by Mr. Laman 

 to this museum as type. 



Potamoclioprus choeropotamiis 



(Desm.) 



Fig. 2. Palatal aspect of the skull 

 of a female Potmnochoeriis porcus 



It is connected witli many 

 difficulties to decide how many 

 different forms ought to be dis- 

 cerned within this group, the 

 more so as the material available 



subsp.? from Lower Congo to show f^j, examination is not sufficiently 



duplicate camnes. ^T^^ r n - j. j.v, 



large. The tollowmg notes there- 

 fore do not, of course, pretend to be definitive but as our 

 knowledge only advances by steps, and as several new facts 



' London 1894. 



- It is also very easily distinguished from the members of the next 

 group by skull characters, the breadth of the skull, the relative dimensions 

 of different parts which may be seen by comparing the measurements 

 recorded in the tables. 



