6 ARKIV FÖR ZOOLOGI. BAND 7. N:0 0. 



in tlie specimen from N. Cameroons 11,3 

 » » » » Sembe, S. of San aga, Cameroons 



(Berlin) 10,9 ^ 

 » another specimen from Cameroons (in B. M.) 13,9 

 » two specimens from Debundscha, Cameroons (Stockholm) 



resp. 14,5 and 15,2 

 and finally in a specimen from S. Cameroons (Berlin) 15,9. 



If it was not for the specimen in the Zool. Museum, 

 Berlin, said to be from Sembe, S. of Sanaga, Cameroons, it 

 Avould appear from these percentages tbat the skulls measu- 

 red represented two different geographic races viz. one more 

 western, distributed from Liberia to Northern Cameroons, 

 with the parietal area narrower i. e. (about 11) 11,3 to 11,6 

 or in one case even 12,7 % of the upper mesial length, and 

 another from the Cameroon mountain and Sothern Cameroon 

 with a broader head and the corresponding percentage from 

 13,9 to 15,9. There would thus be a different race of Bush 

 Pigs in Guinea north of Cameroon, and another in the coun- 

 try from Cameroon and southward, roughly spöken. Against 

 such a theory speaks, however, the narrow-headed specimen 

 from Sembe. 



It is, however, quite possible that the broadheaded race 

 is distributed only in the coast district from the Cameroon, 

 mountain and southward, and that the more narrow-headed 

 race extends its distribution in the interiör further south- 

 east than along the coast depending upon different na- 

 tural conditions of the country. Such a thing is not with- 

 out its analogies, although it in this case wants further con- 

 firmation. 



As the dimensions of the male skulls from different 

 localities appear to indicate two different races it is of im- 

 portance to try to analyse to which races the different names 

 that have been given to members of the Potamochoerus porcus- 

 group may be correctly applied. The oldest specific name 

 is »jwrcus^y Linn.^us which was given to an animal from 

 Guinea, no doubt Upper Guinea.- The next name bestowed 

 upon a West-African River hog was »pejiicillatus» Schinz^ 



The same percentage is found in a specimen onl}^ labeled West 

 Africa. 



- Conf. Majoii's elucidation of this matter 1. c. p. 3G1 — 362. 

 ^ Monograph. d. Säugethiere 1847- 



