348 suid.t:. 



Sus (Gyrosus) pliciceps, Oray, MS. ; Gerrard, Cat. Bones B. M. 



p. 278 ; P. Z. IS. 1864, pp. 100, 383. 

 Sus scrofa, var. pliciceps, Scluter, List Vert. Aniin. Gurd. Zuol. Soc. 



ed. 3. p. 36 ; P. Z. S. 1862, p. 322. 

 Ptychochoerus plicifrons, Fitz. Sitz. Akad. d. Wissen. 1864, p. 409 ; 



Fiihr. s. Zool. Garten z. Mi'mchen, p. 23. 

 Centuriosus pliciceps, Gray, P. Z. S. 1868, p. 41. 

 Japanese Masked Pij?, Bartlett, P. Z. S. 1861, p. 263 (figure) ; Illustr. 



London Mews, 1802, no. 1126 (figure). 

 Chiuesisclies Maskenschweiu, Schmidt, Zool. Gart. 1862, p. 80. 



Hah. Japan ; China. Male in the Gardens of the Zoological So- 

 ciety in 1864. 



Evidently a domestic variety ; the ears are ponduloiis, like those 

 of most domestic animals. The young arc of a uniform colour like 

 the parents, and not striped like the wild species. 



The skull in the British Museum (no. 1387 a), figured in the 

 ' Proc. Zool. Soc' 1862, is very unlike any of the skulls of the Do- 

 mestic Pig in the Museum collection, especially in the breadth of 

 the nose and the rounder form of the tubercle on the base of the 

 slicath of the upper canine. 



Skeleton of a very old animal (no. 1387 b), from the Zoological 

 Gardens. The forehead between the orbits deeply depressed ; nasal 

 bones very flat. 



B. Abnormal Swine (Babirussina). Cutting-teeth f ; intermaiillary, 

 and ma.vitia in front, in-oduced, forming a long diastema between the 

 cutting-teeth and the grinders. Canines erect, parallel ; the sheath of 

 the upper canine bent up from the base, and closely applied to the side 

 of the jaw. Premolars f . f ; the front one very small, and early deci- 

 duous.— Gray, P. Z. S. 1868, p. 4l, 



There are two large oblong deep cavities at the hinder part of the 

 depression behind the hinder nasal opening, separated from each 

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

 be observed in the skulls of other S2iida;. 



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 Hol- 

 land (718o), 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 alf urns'? 



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 



