54—20 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
These slight variations are not, however, more than those due to differences in the 
age or sex of the specimens. This specimen, although the tip of the nasals is 
wanting, shows that the facial portion was relatively shorter in comparison with the 
fronto-parietal portion than is the case with S. 8crofa\ thereby indicating affinity 
with 8. cristatus and its allies, and showing that the cranium is of quite a different 
type from that of S. harhatus. 
In the following table the dimensions of the two specimens’ described above are 
comjDared with those of a male skull of S. cristatus in the writer’s possession ; viz . : — 
S. giganteus. 
^ 
No. 15,385. No. 16,166. 
S cristatus. 
Extreme zygomatic width .... 
8-5 
6-2 
Width at post-orbital processes .... 
51 
4-25 
,, ,, infra -orbital foramina 
2-2 
2-2 
,, ,, narrowest part of parietals . 
1-08 
1-8 
Height of occiput 
6-55 
5-1 
,, ,, foramen magnum .... 
0-9 
0-77 
Width ,, ,, ,, .... 
1-0 
0-8 
Long diameter of condyle .... 
1-6 
1-2 
Interval between foramen magnum and palate 
3 8 
3-25 
Height at infra-orbital foramen 
5-4 
50 
3-9 
Width of palate posteriorly .... 
1-7 
1-6 
1-3 
,, ,, ,, anteriorly .... 
1-5 
1-4 
1-35 
Greatest diameter of orbit .... 
1-35 
16 
Length of three true molars .... 
3-2 
3-7 
2 9 
,, ,, four last cheek-teeth 
3-8 
4-25 
3-42 
M M ft it it 
5-1 
3-95 
Width of intermolar space at m. 2 
1-4 
1-41 
The remarkable narrowness of the intermolar space in the fossil form is well 
exhibited by these dimensions. 
Upper dentition . — The right upper cheek-dentition of the second of the two 
skulls is represented of the natural size in plate XI., fig. 2 of the present volume.^ 
It is in a well-worn condition, and, therefore, indicates a fully adult animal ; and 
agrees precisely with the dentition of the type cranium. The talon of m. 3 is 
comparatively short ; and is more like the corresponding part of the tooth of 8. 
harhatus and 8. vittatus than that of 8. cristatus and 8. scrofa. The crowns of the 
molars are relatively low, and the pattern formed on their worn surfaces is 
comparatively simple : the length of m. 3 slightly exceeds the united lengths of the 
two preceding teeth ; and the whole of the molars are relatively wider than in 
8. cristatus^ and other Asiatic pigs. The last premolar ( pm 4 ) is relatively short 
antero-posteriorly, but this may be an accidental character : both its inner and outer 
halves are relatively largely develoj^ed. The j)enultimate premolar (pm. 3 j is 
relatively a much wider and stouter tooth than in existing pigs ; the width of its 
anterior portion being nearly the same as that of m. 1 , instead of very much less. 
This unusual width is caused by the great development of the outer moiety (a) of 
1 The dimensions of these specimens are taken, with some corrections, from those given in the “Palaeontological 
Memoirs.” 
2 Also represented of half the natural size in pi. LXIX., fig. 2h of the “ F.A.S.” 
