524 FAUNA ANTIQUA SIVALENSIS. 



and the orbit to have been more forward on the face and more 

 depressed below the brow than in AnoplotheiHum 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, 1843, Plate II. fig. 2. 



Figs. 3 and 3 a. — Clialicotherinm Sivalense. Horizontal 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 Avith 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 difl^ereuce, 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 (See page 213). 



This specimen is also figured in the Proceedings Geol. Soc. No. 98, 

 1843, Plate II. fig. 1.— B.M. 



Figs. 4 and 4 «. — Chcdicotheriuin 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 fiirst 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 Chalicotherium. — B.M. 



The dimensions of the specimen are as follows: — 



Extreme length of fragment, 6'8 in. Greatest depth of ramus, 2-1 in. Greatest 

 thickness (towards sj'mphysis), I'l in. Depth of ramus at anterior margin of 

 third premolar, r5in. Length of alveolus of second premolar, '65 in. Breadth 

 of alveolus of ditto, '35 in. Length of third premolar, '7 in. Breadth of ditto, 

 ■5 in. Length of first molar, -Sin. Breadth of ditto, 'Sin. Length of second 

 molar, 1-2 in. Breadth of ditto, -65 in. Length of third molar, 1 -5 in. Breadth 

 of ditto, 'Go in. 



Plate LXXXI. 



Figs. 1, 1 o, and 1 h. — Eqims Sivalensis (Falc. and Caut.). Cra- 

 nium. Upper, palate, and lateral views. The specimen is broken off 

 transversely in fi-ont 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. (See antea, p. 186.) 



Length of fragment, 15' in. Between extreme points of zygomata, 8'1 in. Be- 

 tween anterior angles of the orbits, 6-2 in. Breadth of nasal ridge at sub-orbital 

 foramen, 2-7 in. Height of cranium from palate at ditto, 3-3 in. From anterior 

 angle of orbit to nasal notch, 6' in. Great diameter of orbit, 2-6 in. Lesser dia- 

 meter of orbit, 1-9 in. Depth of zygomatic fossa, 1-8 in. Greatest width of cra- 

 nium at root of z3'gomata, id in. Height of cranium from base of occipital to 

 summit of sagittal crest, 3-6 in. From lower border of occipital foramen to pos- 

 terior border of palate, 8-5 in. Length of three tme molars, 3'1 in. Length of 

 two posterior premolars, 2-2 in. Width of palatine notch, 1-9 in. Width of 

 palate posteriorly, 3'3in, Width of palate anteriorly, 2-5 in. Width of alveoli, 

 1-2 in. 



