284 “UNGULATA 
man Islands: S. feéranus, Formosa; 8. leucomystaz, Japan; 8. 
verrucosus, Java, Borneo, Ceram; 8. barbatus, Borneo; S. celebensis, 
Celebes, Philippines, and Moluccas; 8. longirostris, Borneo and 
Java. The last four species form an allied group in which the 
facial portion of the skull may be greatly 
elongated ; 8. barbatus and SS. celebensis 
being characterised by the small size and 
simple structure of the talon of the third 
molars. The skull of S&. longirostris is 
shown in Figs. 104 and 105. The small 
S. andamanensis also has very simple third 
molars. 8S. vittatus, S. leucomystaa, S. cris- 
tatus, S. tuéranus, and S. papuensis form 
another group, in which the third molar 
is generally of very complex structure, 
more or less closely allied to the Wild 
Boar; and Dr. Nehring is inclined to 
think that the whole five might be in- 
cluded under a single specific name. This 
list will give some idea of the geographical 
distribution of wild Pigs, but it must be 
borne in mind that through the whole of 
this region, and in fact now throughout 
the greater part of the habitable world, 
Pigs are kept by man in a domesticated 
state, and it is still an open question 
whether some of the wild Pigs of the 
islands named above may not be local 
races derived originally from, or crossed 
with, imported domestic specimens. In 
New Zealand a wild or rather “feral” 
race is already established, the origin of 
which is of course quite recent, since it is 
Fic. 105.—Frontal aspect of well ascertained that no animal of the 
the cranium of Sus longirostris. kind ever lived “pon th is] a ] 
} natural size. (From Nehring.) P € isian unt 
after its settlement by Europeans. 
Whether the various breeds of domestic Pigs have been derived 
from one or several sources is still unknown. As in so many 
similar cases, there is no historie evidence upon the subject, 
and the researches of naturalists, as Nathusius, Riitimerer, 
Rolleston, Nehring, and others, who have endeavoured to settle 
the question on anatomical evidence, have not led to any satis. 
factory conclusions. It is, however, tolerably certain that all 
the species or forms of wild Pigs enumerated above and all the 
domestic races are closely allied, and it is probable (though of 
this there has been no opportunity of proof) will breed freely 
