DESCRIPTION OF PLATES, 89 
Figs. 8, 3 a, and 3 6.—Sus giganteus. Cranium. Upper, palatal, and 
lateral views. The right zygoma is imperfect, and the left is almost 
absent; but, in other respects, the cranium is more perfect than in figs. 
1 or 2. There are three molars and three premolars on either side. 
The incisive alveoli and the tuberosity and alveolus of the right 
canine are also present.— B.M. 
Length of fragment, 14°3in. Width of cranium superiorly at sub-orbital fora- 
men, 1‘8in. Height of ditto from palate, 3:3in. Length of canine tuberosity, 
4-in. Length of molar series, 5-6in. Length of three true molars, 3°5in. From 
posterior border of palate to anterior margin of incisive alveolus, 7‘6in. From 
posterior border of palate to posterior angle of incisive foramen, 8:7in. Diasteme 
between canine and external incisor, 1-in. Width of palate posteriorly, 1:2 in. 
Ditto between canines, 2:in. Greatest width of alveoli, 1:2 in. 
Fig. 4.—Sus giganteus. Lower jaw, right side. The ascending 
ramus is mostly absent. Shows three molars and three premolars, with 
canine and incisive alveoli. 
Length of fragment, 11‘5in. Height of horizontal ramus, 2:in. Thickness of 
ditto, 1:-7in. Length of symphysis superiorly, 3°3in. Length of three true molars, 
3°5in. Length of ditto, with three posterior premolars, 5-in. Interval between 
first and second premolars, ‘9in. Interval between second premolar and canine, 
1:5in. Between canine tuberosities, 3°9in. Width between molars posteriorly, 
15in. Between ditto anteriorly, 1-7 in. 
Figs. 5 and 5 a.—Sus scrofa (var. Indicus). 
lower jaw, not fossil. Upper and lateral views. 
natural size.—B.M. 
Entire skull, with 
One-third of the 
PLATE LXX. 
Figs. 1 and la.—Sus (Hippohyus) Sivalensis (Fale. and Caut.).! 
Cranium. Upper and palatal views. Except that the zygomatic arches 
are absent, the specimen is very perfect. Shows three molars and two 
last premolars on either side, with alveoli of canines and six incisors. 
The sub-orbitary and incisive foramina are well marked.—B.M. 
Extreme length of fragment, 9°2in. From post. plane of occipital condyles to 
anterior margin of incisive alveolus, 9°in. From lower border of occipital foramen 
to post. border of palate, 2°3in. From post. border of palate to posterior border of 
incisive foramen, 5-4in. Width of palate between second molars, 1-lin. Width of 
ditto between inner margins of canine alveoli, 1-05 in. 
anterior angles of middle incisive alveoli, ‘7 in. 
Length of the three true molars, 2°7 in. Dias- 
Length of the molar series, 4°3 in. 
1 «Jn this extinct genus of quadrupeds 
from the Himalayan tertiary deposits, 
the dental formula shows incisors <= 
and corresponds with that of the Chero- 
potamus in the number of canines, pre- 
molars and molars; but the true molars 
have a more complex crown, approaching 
nearer to those of the typical Suid@ in 
the depth and number of the secondary 
enamel folds. Each upper true molar 
has its crown cleft by the common or 
primary crucial valleys, the transverse 
one passing somewhat obliquely from 
within forwards and outwards. Hach of 
the four principal lobes is subdivided, 
not by a vertical central depression, 
Width of ditto between 
Greatest width of alveoli, ‘8 in. 
but by a fold penetrating its anterior 
and posterior margins. The enamel at 
first shows additional minor plications, 
but is worn down to the simpler pattern 
above described; the outer lobes are 
convex externally. The first premolar 
is very small and simple, separated by 
an interval of its own breadth from the 
second; both this and the third have 
transversely compressed crowns; the 
fourth has a sub-trihedral crown. The 
Hippohyus equalled in size the Chero- 
potamus, but exhibits as strong a ten- 
dency towards the Hippopotamoid family 
as that does towards the plantigrade 
Carnivora. —Owen’s ‘Odontography,’ vol. 
1. p. 562. 
