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Show 36 DR. J. E. GRAY ON THE SUID E. [Jan. 9, 2. POTAMOCHCERUS PORCUS. Red River-Hog. B.M. Ears densely hairy ; edges of ears and pencil white. Fur red-brown, beneath greyish white. Head and ears black ; whiskers on the cheek, streak over and below the eyes, and dorsal mane white. Skull.-Male, the prominence of the canine flat-topped and not raised above the surface of the nose; the lateral process of the sheath of the upper canine narrow at the base, dilated above, short, not reaching to the level of the upper surface of the nose. Female, with only a ridge across the base of the sheath of the upper canine. Porcus guineensis, Marcgr. Bras. 230, fig. (good). "Cochon de guinee, Buffon, H. N. v. 146." Guinea Pig, Brown, Jam. 487. Sus porcus, Linn. S. N. 1032. Pore de guinee, Desm. Mamm. 391 ; Enc. Meth. t. 39. f. 1 (from Marcg.). Sus scrofa, var. porcus, Fischer, Syn. 423. Sus guineensis, Brisson, R. A. 109. Sus africanus, Smith; Griffith, A. K. (not Desm.). Sus penicillatus, Schinz, Monogr. d. Saugeth. t. 10; Rev. Zool. 1848, p. 152; Gray, P. Z. S. 1852, p. 132. Choiropotamuspictus, Gray, Ann. & Mag. N. H. x. 280, 281. Painted Pig of the Camaroons, Illustr. London News, fig., 1852. Sus pictus, Wagner, Schreb. Saugeth. Supp. v. 302, 800. Potamochcerus albifrons, Du Chaillu, Proc. Boston N. H. S. vii. 301, 1861 ; Travels, p. 422, t. 62 ; Gray, P. Z. S. 1861, p. 277. Potamochcerus penicillatus, Gray, Ann. & Mag. N. H. xv. 66 ; P. Z. S. 1852, p. 131, t. 34; Gerrard, Cat. Bones, B. M. 279 ; Fitz. Kais. Akad. d. Wissen. xix. 365 ; Sclater, P. Z. S. 1861, p. 62, t. 12 (adult and young). Hab. West Coast of Africa; Camaroons River; Guinea; naturalized in Brazil (Marcgrave). Skeleton (no. 1363 a) of a male specimen, from the Camaroons, that lived for several years in the Society's Gardens. The skull of this animal is figured by Mr. Sclater in the ' Proceedings of the Zoological Society,' 1860, p. 301. The process on the base of the sheath of the canine is much shorter than in the skulls of P. africanus (1364 a, b) ; it does not reach the upper surface of the nose, is sub-cylindrical at the base, without any keel on its outer side, and broad at the end. It diverges much more from the side of the nose than in the skull from South Africa. Two skulls, collected by Dr. Baikie in the interior of Africa (1363 c and 1363 a7). They are very like the skull of the male animal from the Camaroons (1363 a). The process of the sheath of the upper canine in 1363 c is rather shorter and broader at the top than in that skull; and in 1363 a it is unfortunately broken off. With these skulls Dr. Baikie brought another without the lower jaw (715 b), which is very like the others, only the side of the nose over the canines is not dilated, and there is only a slight ridge across the base of the upper surface of the sheath of the upper canine as in |