134 EINAR LONNBERG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 
am | F() ae 
Brit. Mus Nairobi Nairobi Gheleb, 
Sane, 17 B. E. A. B. BE. A. Eritrea 
iF mm. | mm. mm. mm. 
Upper mesial length from occipital crest to tip of nasals ... . 361 349 332 348 
lWidtheot parietal. tlatwareiivs ss eha-) syetidks Bays yicicst ee edee ee = 31 29 | 40 48 
| Greatest width at lambdoid crest. . . . . . Se ee ad 86 | 71 60 98 
Distance from postorbital process to lambdoid crest. ...... 98 89 92 97 
Greatest zygomatic width ........... OWE. Meio S 170 177 | 162 161 
| Width at postorbital processes... 2-5 -.-...-.-.-+-.e- 102 | 106 109 101 
Least interorbital width ....... fe NS FANE RIAA ORS hee 69 79 78 72 
Distance from orbit to front end of naso-premaxillary suture . . 203 | 193 179 191 
Distance from hind surface of m* to tip of premaxillary ... . — 212 199 212 
[nen gph) of 0 ae ee eee ke 5a. a Pee 33,5 33 33 32 
Least width of skull between lambdoid crest and zygomatic arch 63 59 | 53 64 
| Least width of nasal surface of skull between the orbit and the | | 
apophyses above the canines ...-...€-+.+-+.+..+../] == | 56 43 51 
Width across upper ends of the canine apophyses. ...... «| Sy 91 _- = 
Width of nasal region on a level with anterior margin of canine | | | 
alwenles: ajact cpt dwn » 5) Vague lls 62 thesmrowemn (sb Belin Pals dant aid — 34 | 35 38 
representatives of P. chawropotamus have a much broader parietal area amounting to 
about 12 °/o of the upper length of the skull, while the somewhat more northern race 
P. ch. maschona has a narrower parietal area (amounting to about 6 °%o) than the 
Kenia Bush Pig. In some respects the skull of this latter strongly reminds about 
the West African Bush Pigs of the P. porcus group, especially by the great breadth 
of the posterior nasal region (Pl. X, fig. 3) between the orbits and the canine apo- 
physes when compared with the anterior nasal portion in front of the apophyses 
mentioned. The nasal surface is flat especially in its posterior two thirds. The canine 
apophyses are very strongly developed in the boar(?) skull (Pl. X, fig. 1 & 3), their 
shortest anteroposterior diameter being 37 mm., and, although they hardly reach 
the level of the nasal surface they are very broadly anchylosed with the lateral exo- 
stoses of the snout so as to form a canal on the side of the upper jaw. This is the 
more striking as the animal to judge from the condition of the teeth (Pl. X, fig. 2) 
is not very old. Such a coossification between the canine apophyses and the lateral 
exostoses of the snout I have seen in, and also described from boar skulls of the P. 
porcus group, but I have not seen it in other members of the P. chwropotamus group 
than this one so that I do not know if it is a common occurrence there, which ap- 
pears, however, hardly probable. 
The anterior portion of the zygomatic arch in the boar skull (Pl. X, figs 2 & 3) 
of the Kenia race forms a right angle towards the longitudinal axis of the skull, and 
at the some time the anterior bony wall formed by this arch stands nearly vertically. 
In the sow the latter is more sloping, but comparatively less than generally is the 
rule in the P. chewropotamus group. 
