42 DR. J. E. GRAY ON THE SUID^. [Jail. 9, 



other by a sharp, high, central, longitudinal lamina, that are not to 

 be observed in the skulls of other Suidce. 



These depressions seem to become deeper as the animal increases 

 in age. I have only observed them in specimens which have vyell- 

 developed canines ; they may be confined to the males. 



There is in the British Museum a small skull, obtained from Hol- 

 land (718 o), of a half-grown animal, which has developed its second 

 true grinder, and which is without canines, only having a slight 

 ridge on the bone at the place where they are developed in the other 

 skulls. The skull has no indication of the depression in the hinder 

 part of the hinder nasal opening, and the grinders are much smaller 

 than those in any other skull. Is it the skull of a female, or does 

 it belong to a distinct species allied to Babirussa alfiirusl 



The prolongation of the skull in front and the length of the sepa- 

 ration of the cutting-teeth from the grinders are produced by the 

 prolongation of the maxilla in front and the elongation of the inter- 

 maxilla behind. The first premolar is very early deciduous ; it is 

 only to be observed in skulls of young animals ; but the spot where 

 it was placed is sometimes indicated by a porous structure in the 

 full-grown skull, as in specimen no. 718/. 



6. Babirussa. 



Face conical, simple. Ears rounded. Tail and limbs slender. 

 Skull conical ; nose elongate, simple ; the hinder upper part of the 

 intermaxillary bones smooth ; the upper cutting- teeth large, equal, 

 equidistant ; the sheath of the upper canine bent upwards from the 

 base at the side of the jaw ; canines arched backwards, sometimes 

 even spirally recurved ; lower premolar compressed. 



Babirousa, Gray, Ann. Phil. 1825. 



Babiroussa, F. Cuv. Dent. Mam. 212, t. 86*. 



Babirussa, F. Cuv. Dent. Mam. ; Lesson, Man. 338 ; Grray, List 

 Mamm. B. M. 18.5; P. Z. S. 1852, p. 131; Gerrard, Cat. Bones 

 B. M. 278. 



Porcus, Wagler, Syst. 17 ; Fitz. Sitz. Akad. Wissen. 1864, p. 435. 



M. F. Cuvier, when adopting this genus, described and figured 

 the grinders as small and nearly equal-sided (see Dent. Mamm. t.); 

 but this is a mistake ; they are as large and elongate as the grinders 

 of the other Pigs, compared with the size of the skull. This genus 

 was first distinctly characterized in the ' P. Z. S.' 1852, p. 131. 



Babirussa alfurus. B.M. 



" Fur ashy ; dorsal streak yellowish brown ; beneath ferruginous- 

 washed." 



Jpe7' orientalis, Brisson, Regn. Anim. 110. 



Sus babyntssa, Linn. S. N. 50 ; Quoy & Gaim. Voy. Astrol. Zool. 

 i.l25, t. 22, 23; Isis, 1836, t. 13; Schinz,Monogr. iv. 5, t. 5. ta-d; 

 Blainv. Oste'ogr. t. 2, t. 5 (skull, S ). 



Sus baberovssa, Bodd. Elench. i. 157. 



