SIWALIK camelopardalida:. 
23—121 
true molar is by far tlie most prominent point on the whole of the outer surface of 
the jaw. 
The molars are constructed after the usual type prevalent in the present 
family, and are coated by a moderately rugose enamel, of somewhat finer struc- 
ture than that of Sivaiherium. The molars are further distinguished from those of 
the latter genus by the smaller degree of development of the 4 costae ’ on the inner 
surfaces of the 4 lobes/ as well as by the greater obliquity of the c lobes ’ them- 
selves to the long axis of the crown. The penultimate premolar ( p.m. 3. ) differs 
from that of the giraffe in possessing no distinct 4 lobe ’ on its inner aspect, the pro- 
cesses from the 4 crescent ’ forming the inner surface. In this respect Hydaspither- 
ium seems to agree with all other ruminants in which the penultimate lower 
premolar is known, the specialisation of that tooth in the giraffe being apparently 
peculiar to that animal. 
The anterior 4 crescent ’ of the first true molar in the jaw before us presents a 
slight rudiment of a 4 cingulum 5 anteriorly, and in all the three true molars there is 
a very minute tubercle in the 4 median valley/ attached to the anterior 4 crescent,’ this 
rudimentary tubercle being most developed in the first true molar. 
In the following table the dimensions of the lower jaw under consideration are 
compared with those of a lower jaw of Camelopardalis giraffa in the Indian Museum 
and also with those of a lower jaw of a full-sized individual of Sivaiherium gig anteum} . 
Camelopardalis. 
Hydaspitherium. 
Sivatherium. 
Length of whole molar series 
6-5 
103 
„ of four last teeth . . . . 
4-1 
77 
9-0 
„ from ‘angle’ to ‘diastema. ... . . . 
10 5 
14 5 
Height from „ to summit of condyle . 
5'8 
7'5 
Depth at middle ‘ crescent ’ of last molar 
175 
3-3 
47 
„ at hinder „ of first 
175 
2-52 
3-45 
„ at second premolar ........ 
155 
2-4 
3'0 
Thickness at first molar . . . . . . 
1-0 
• 1-95 
2-15 
Length of first true molar 
10 
1-85 
2-05 
Width of „ „ . 
09 
1-3 
1*55 
Length of second „ ... a ... . 
1-15 
.1-87 
2T5 
Width of „ „ 
09 
1 35 
155 
Length of third „ 
175 
264 
2-95 
Width of „ „ 
09 
1-25 
1-6 
Height of „ „ 
1-14 
17 
2-0(?) 
The jaw of Sivaiherium measured in the foregoing table is probably that of a 
male individual, other specimens being slightly smaller, and probably belonging 
1 This jaw is in the British Museum, and will be alluded to in the sequel. It is figured in the “Palaeontological 
Memoirs” (pi. XXI, fig. 1), and there is a cast of it in the Indian Museum. It contains the last premolar, and the 
three true molars. 
