DESCRIPTION OF PLATES. 103 
PuaTe LXXX. 
Chalicotherium Sivalense (Fale. and Caut.). 
Figs. 1, la, 16, and 1 c.—Anterior half of an adult head, with the 
upper and lower jaws in natural apposition, and exhibiting the greatest 
portion of the dental series of both jaws. The greater part of the 
cranium proper is absent. ‘The specimen demonstrates the very re- 
markable fact that the Chalicotherium Sivalense was entirely destitute 
of incisor teeth in either jaw. ‘The intermaxillary bones are perfect to 
their tips, and consist of slender slips of bone converging to a sharp 
point; they show that no incisor teeth could have existed in the upper 
jaw at any period of the animal’s age. The anterior portion of the 
lower jaw is perfect to the alveolar edge. A detached canine is seen 
on either side, but the intervening space is without a vestige of incisors, 
and is contracted in correspondence with the convergence of the 
intermaxillary bones, and sloped off to a fine edge. The upper jaw 
is also destitute of canines, or of any trace of canine alveoli; but 
the lower jaw contains two canines, as shown in figs. 1@ and 13, 
the crowns of which are thick, cuneiform, and somewhat triangular, 
and slightly inclined forwards, with a blunt apex. The specimen 
shows three premolars and the first true molar; the two back molars 
are absent. The characters of the molars are better seen in figs. 3 
and 4, and are described in great detail in Dr. F.’s memoir on Chali- 
cotherium. 
This beautiful specimen was originally in the Dadoopoor collection 
of Messrs. Baker and Durand, and is now in the Museum of Marischal 
College, Aberdeen. Cast in B.M. Its dimensions are as follows :— 
Length of intermaxillary bone of right side, 3:in. Greatest depth of ditto, 
‘4in. Length of three premolars and first molar, 2°6in. Length of three premo- 
lars, 1:8in. Breadth of fragment opposite last premolar, 3°2in. Breadth of pa- 
late ‘5 in. in front of anterior premolar, 1°5 in. Breadth of palate 1:2 in. in front of 
anterior premolar, 1-lin. Height of fragment of maxillary bone from alveolar 
border (right side), 2°5in. Length of fragment of maxillary bone on right side, 
3'9in. Greatest breadth of anterior nares, 1:3in. Extreme length of fragment 
of lower jaw, 5°5in. Length of symphysis, 3-lin. Depth of horizontal ramus at 
posterior border of first molar, 16in. Greatest thickness of ramus at ditto, -8 in. 
Interval between the horizontal ramus at ditto, l-in. Breadth of lower jaw at 
posterior border of symphysis, 2.2in. Least breadth of symphysis, 1‘lin. From 
posterior border of symphysis to narrowest part of symphysis, 1:‘9in. Between 
alveolar border of canines, 1:°2in. Breadth of incisive margin, *9in. Width of 
palate posteriorly between first molars, 1:3in. Length of first premolar, upper 
Jaw, right side, ‘Sin. Length of second premolar ditto, °55in. Length of third 
premolar (greatest) ditto, -7in. Length of first molar ditto, -95in. Breadth 
of first molar ditto, 1:03 in. Breadth of third premolar ditto, -9in. Breadth of 
second premolar ditto, ‘76in. Breadth of first premolar ditto, -53in. Length of 
three premolars and first molar, 2°8in. Length of three premolars, 1°8in. Be- 
tween opposed margins of canine and first premolar, -9in. Between anterior 
margin of first premolar and incisive margin, 1-7in. Length of first premolar, 
lower jaw, ‘5in. Length of second premolar, ditto, ‘6in. Length of third premo- 
lar, ditto, *8in. Length of first molar, ditto, 1:0in. Breadth of first molar, ditto, 
‘6in. Breadth of third premolar, ditto, ‘5in. Breadth of second premolar, ditto, 
-43in. Breadth of first premolar, ditto, °3in, Length of crown of canine, ‘45 in. 
Breadth of crown of canine, *8 in. 
Fig. 2.—Chalicotherium Sivalense. Upper jaw, right side, with part 
of orbit, three true molars and last premolar. The muzzle seems 
to have fined off rather abruptly in front of the molar protuberances, 
