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Show 42 DR. J. E. GRAY ON THE SUIDAE. [Jan. ^' 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 well-developed canines; they may be confined to the males. There is in the British Museum a small skull, obtained from Holland (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 alfurus 1 The prolongation of the skull in front and the length of the separation 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. 7181. 6. BABIRUSSA. Face conical, simple. Ears rounded. Tail and limbs slender. Skull conical; nose elongate, simple ; the hinder upper part of the iutermaxillary 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, Grav, Ann. Phil. 1825. Babiroussa, F. Cuv. Dent. M a m . 212, t. 86*. Babirussa, F. Cuv. Dent. M a m . ; Lesson, Man. 338 ; Gray, List M a m m . B. M . 185; P. Z. S. 1852, p. 131; Gerrard, Cat. Bones B.M. 278. Porcus, Wagler, Syst. 17 ; Fitz. Sitz. Akad. Wissen. 18G4, p. 435. M . F. Cuvier, when adopting this genus, described and figured the grinders as small and nearly equal-sided (see Dent. M a m m . 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 ferru°*inous-washed." Aper orientalis, Brisson, Regn. Anim. 110. Sus babyrussa, Linn. S. N. 50 ; Quoy & Gaim. Voy. Astrol. Zool i. 125, t. 22, 23; Isis, 1836, t. 13; Schinz,Monogr. iv. 5, t. 5. f. a-d; Blainv. Oste'ogr. t. 2, t. 5 (skull, cf ). Sus baberoussa, Bodd. Elench. i. 157. |