306 CATALOGUE OF UNGULATES 



Family I.— SUIDJ^^. 



Head terminating in an elongated mobile snout, the tip 

 of which forms an expanded, truncated, nearly naked, flat, 

 oval disc containing the nostrils, and supported by a 

 prenasal bone ; feet narrow, with four toes in front pair, the 

 hoofs of the two middle ones in each pair with their adjacent 

 surfaces flattened, and those of the lateral ones not applied 

 to the ground in walking ; teeth typically forty-four, but the 

 number frequently reduced by suppression of one or more 

 pairs ; incisors rooted ; molars elongated, with the outer and 

 inner pair of tubercles connected by intermediate ones, and 

 not forming distinct trefoils ; no descending flange to 

 mandible. 



Distribution co-extensive with that of section. 



The family is divisible into the two following sub- 

 families : — 



A. Four toes 'to both fore- and hind-limbs ; upper 



canines curving more or less upwards or outwards ; 

 stomach simple, except for a larger or smaller 

 cardiac pouch ; no dorsal gland ; at least 4 teats Suina. 



B. Hind-feet with only three functional toes ; upper 



canines directed downwards ; stomach complex ; a 



dorsal gland; 2 teats Dicotylince. 



Subfamily i, — SUINiE. 



Four complete toes to each foot ; teeth typically forty- 

 four, but often reduced by the suppression of one or more 

 pairs ; upper canines curving more or less outwards or 

 upwards ; stomach simple, except for a more or less 

 developed cardiac pouch; no dorsal gland; at least four 

 teats; tail well developed; third and fourth .metacarpals 

 and metatarsals completely free. 



The distribution is limited to the Old World, extending 

 at the present day so far eastward as New Guinea, although 

 there is very strong probability that the Papuan forms were 

 introduced by human agency. 



The subfamily is divisible into the following generic 

 groups : — 



