IO20 



THE UNGULATES, OR HOOFED MAMMALS 



skin. Not only is the face furrowed, but thick folds of skin, which are harder than 

 the other parts, almost like the plates on the Indian rhinoceros, hang about the 

 shoulders and rump. It is colored black, with white feet, and breeds true. That 

 it has long been domesticated, there can be little doubt; and this might have been 

 inferred even from the circumstance that its young are not longitudinally striped." 

 From a study of its skull, Professor Nathusius regards the masked pig as nearly al- 

 lied to the Chinese breed; but, as Darwin remarks, "if this be really the case, it is a 

 wonderful instance of the amount of modification which can be effected under 

 domestication.,' ' 



MASKED JAPANESE PIG. 



(One-sixteenth natural size.) 



The African bush pigs the Bosch- Varks of the Cape Boers dif- 

 fer from the typical members of the genus by always having one pair 

 less of cheek-teeth, owing to the absence of the first premolar on each side of the 

 lower jaw, while frequently the corresponding upper tooth is likewise wanting in 

 the adult. The molar teeth are also distinguished by their simpler structure, the 

 last in the lower jaw having the third lobe much reduced in size. The tusks are 

 scarcely larger than those of domestic pigs, and the snout is unusually elongated. 

 On each side of the face immediately below the eye there is a large swelling, due to 

 the great development of a ridge of bone on the sheath of the upper tusk. The 

 gray bush pig (S. africanus}, ranging from South to Central Africa, has the hair of 

 a grayish-brown color, and no pencils of hair on the ears. It generally frequents 



