1908.] SKULLS IN THE BRITISH MUSEUM. 939 



i-udiments appeared to represent the median pair. Specimen 

 0.3.25.17, on the other hand, is provided Avithfour well-developed 

 incisors in the lower jaw. The lower incisors are thus subject to 

 great variation, but the upper ones appear to be constantly 

 missing, as the premaxillary is too thin to carry any teeth, just as 

 in Ph. cethiopicus. The two skulls in question resemble the Cape 

 "Wart- Hog {Ph. cethiopicics) in other respects, too, both in general 

 shape and with regard to particular features, as will be seen from 

 the following comparison. The postorbital portion of the skull is 

 very short in Ph. cethiopicus, about 10 "3 % of the length of the 

 skull in a specimen in the Royal Natural History Museum of 

 Stockholm (brought home by Sparrmau), 10"5 °/^ in specimen 

 0.3.27.17 and 10-9 7^ in specimen 0.3.27.16 in the British Museum. 

 The width of the postorbital flat area is greater than the length of 

 this portion, viz. 13*3 ^/^ in Sparrman's specimen, which is the 

 oldest, and respectively 11*9 % ^^^^^ ll"5°/o "^ Lord Delamere's 

 two specimens. The interorbital width is rather greater in 

 Sparrman's specimens, viz. 36"5 °/^, than in the two others, respec- 

 tively 33"0 °/o and 34*7 °/^. There was no locality indicated on the 

 labels of Lord Delamere's two Wart-Hog skulls, and I believed, 

 therefore, judging from their resemblance to Fh. cethiojncus, that 

 they originated from the Cape. Mr. Oldfield Thomas, however, 

 kindly informed me that this was not the case, as Lord Delamere 

 had travelled in ISTorth- eastern Africa, Somaliland, and British 

 East Africa, and the skulls were most probably from Somaliland. 

 This made the matter more complicated, but at the same time 

 more interesting, as it was not probable that the same race of 

 Wart-Hog inha.bited two countries so far apart when the inter- 

 vening countries were occupied by widely different races. A 

 renewed examination revealed also that LoitI Delamere's Wart- 

 Hogs differed in some respects from Ph. cethiopicics, although the 

 general shape of the skull (especially the postorbital portion) was 

 similar. The nasals of Ph. cethioincus are " anteriorly rather 

 evenly convex, but form in their posterior portion behind the 

 foramina infraorbital ia a i-oof-like ridge or elevation"*. In 

 Lord Delamere's Wart-Hogs the nasals are rather flat along their 

 whole extent, without forming any ridge posteriorly. The choanfe 

 are broad, much widened posteriorly in Lord Delamere's Wart- 

 Hogs, but in Ph. cethiopicus they are not wider behind than in front 

 and the margins are parallel. The sphenoidal pits are comj)letely 

 open, not covered by any bony roof, in Lord Delamere's Wart-Hogs, 

 but the lateral walls formed by the pterygoids are high so that adeep 

 canal is formed. The distance from the hind margin oi foraminci 

 palatinct to the hind margin of the palate measured in a straight 

 line is respectively 50 and 51 mm. in the two specimens of 

 Lord Delamere's Wart-Hogs, but only 35 mm. in Ph. cethiopicus, 

 although the latter specimen is older and a little larger. As these 

 differences ax'e qviite recognizable and moi-e material, no doubt, 

 on direct comparison, will add other characteristics osteological 

 * Lonnbei'g, ?. c. p. 55. 



