104 FAUNA ANTIQUA SIVALENSIS. 
and the orbit to have been more forward on the face and more 
depressed below the brow than in Anoplotherium commune. The 
upper surface of the sub-orbitary canal is seen opening behind the 
anterior angle of the orbit, the floor of which seems to have extended 
behind the post-orbitary processes. —B.M. 
This specimen is also figured as Anoplotherium Sivalense in the Pro- 
ceedings Geol. Soc., No. 98, 1848, Plate II. fig. 2. 
Figs. 3 and 8 a.—Chalicotherium Sivalense. Worizontal and lateral 
view of left upper jaw, comprising the three true molars and three 
premolars. The true molars, and especially the two last, are enormously 
large in comparison with the other teeth, or with the dimensions of the 
head. If found isolated, they would seem suitable to an animal 
approaching the size of Rhinoceros, whereas the anterior part of the 
lower jaw and the muzzle do not reach the dimensions of the Indian 
Tapir. The outer surface of the molars presents both vertically and 
horizontally the double chevron or W form of Anoplotherium, but 
with this difference, that the surface of the re-entering angles is more 
inclined inwards. The characters of the teeth in this specimen are 
minutely described in the memoir on Chalicotherium. 
This specimen is also figured in the Proceedings Geol. Soc. No. 98, 
1843, Plate II. fig. 1—-B.M. 
Figs. 4 and 4a.—Chalicotherium Sivalense. Fragment comprising 
the left half of the lower jaw from the angle on to the commencement 
of the symphysis of an individual which was not quite full grown, 
containing three true molars and the last premolars, with the empty 
alveoli of the first two premolars. The last premolar is fully pro- 
truded, but unworn; the last molar is in the germ state. The 
characters of the teeth in this specimen are minutely described in the 
memoir on Chalicothertum.—B.M. 
The dimensions of the specimen are as follows :— 
Extreme length of fragment, 6°8in. Greatest depth of ramus, 2‘lin. Greatest 
thickness (towards symphysis), l:-lin. Depth of ramus at anterior margin of 
third premolar, 1-5in. Length of alveolus of second premolar, ‘55in. Breadth 
of alveolus of ditto, °35in. Length of third premolar, -7in. Breadth of ditto, 
‘din. Length of first molar, ‘8in. Breadth of ditto, -5in. Length of second 
molar, 1:2in. Breadth of ditto, °65in. Length of third molar, 1‘5in. Breadth 
of ditto, *65 in, 
Puate LXXXI. 
Figs. 1, la, and 1b.—Kquus Sivalensis (Fale. and Caut.). Cra- 
nium. Upper, palate, and lateral views. The specimen is broken off 
transversely in front of the second premolar. The three true molars 
and two back premolars on the right side are well preserved. The 
left alveolar ridge is mostly deficient.—B.M. 
Length of fragment, 15:in. Between extreme points of zygomata, 8:lin. Be- 
tween anterior angles of the orbits, 6-2in. Breadth of nasal ridge at sub-orbital 
foramen, 2°*7in. Height of cranium from palate at ditto, 3°3in. From anterior 
angle of orbit to nasal notch, 6-in. Great diameter of orbit, 2°6in. Lesser dia- 
meter of orbit, 1:°9in. Depth of zygomatic fossa, 1:‘8in. Greatest width of era- 
nium at root of zygomata, 45in. Height of cranium from base of occipital to 
summit of sagittal crest, 3°6in. From lower border of occipital foramen to pos- 
terior border of palate, 8°5in. Length of three true molars, 3:lin. Length of 
two posterior premolars, 2°2in. Width of palatine notch, 1-9 in. Width of 
palate posteriorly, 3°3in. Width of palate anteriorly, 2-5in. Width of alveoli, 
1-2 in, 
