3. POTAMOCHCBBUS. 343 



PotamocHoerus penicillatus, Gray, Ann. 8f Mag. N. H. xv. p. 66 ; 



P. Z. S. 1852, p. 131, t. 34; Oerrard, Cat. Bmes B.M. p. 279; 



Fitz. Skis. Akad. d. Wissen. xix. p. 365 ; Sclater, P. Z. S. 1861, p. 62, 



t. 12 (adult and young). 

 Potaniochoerus porcus, Gray, P. Z. S. 1868, p. 36. 



Hah. "West Coast of Africa; Camaroons Eiyer; Guinea; natu- 

 ralized 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 Zoo- 

 logical 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, 6) ; 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 d). They are Very like the skuU 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 

 the female from the Gardens (1363 6). The skull has adult den- 

 tition, and it is nearly of the same size, but not so aged, as the skull 

 sent by Captain Alexander ; it differs from it in the nose being more 

 compressed and narrowed in front of the orbit. The condyles of 

 this skull are large, and separated by a broad space beneath, as in 

 all the other skulls of the genus, except that received from the 

 Zoological Society. 



A skeleton of a female, from the Camaroons, that lived in the 

 Society's Gardens (Gerrard, Cat. Bones, no. 1363 6). In the ' Cata- 

 logue of Bones of Mammalia in the British Museum ' the sexes of 

 1363 a and b are accidentally reversed. The skuU had the denti- 

 tion of an adult animal ; the canines are very imperfectly developed, 

 cylindrical, and smooth, and the sides flattened and grooved longi- 

 tudinally beneath. The side of the nose of the skull is not swollen 

 or warty over the canines, and there is only a well-marked ridge at 

 the base of the upper surface of the sheath of the upper canine. 



This skull differs from the others of the genus I have compared 

 it with in the small size of the occipital condyles, which are also 

 closer together on their under edge. The hinder nasal opening is 

 wide and rounded. 



The three skulls also differ in the form of the upper jaws in front 

 of the base of the canines. They are longer and narrower in the 

 two skulls which have been named P. larvatm (1364 a, 1364 6) than 

 they are in the skull from the Camaroons named P. penidUatus or 

 P. porevs (1363 a). But the two skuUs with the longer intermaxil- 



