9 i Records of the Geological Survey of India. [vol. xi. 
median costfc arc still less developed, those of the hinder barrels being indeed 
almost obliterated; if a rod be laid on the dorsa of the barrels of the last molar, 
it only touches the posterior costsc of the barrels, and not the median costa of either 
barrel, -which shews that the form of the tooth is still further removed from that 
of the teeth of Sivatherium than are the teeth of H. leytognatlvus. Perhaps the 
most distinguishing character of the specimen is the form of the dorsum of the 
anterior barrel of the last premolar; this sui'face is fan-shaped, naiTower below 
than above, and nearly flat, the median costa being very slight, and the anterior 
costa forming a curved boundary to the dorsum. In the corresponding tooth of 
Slvatlierimn the median dorsal costa is very large, and is the most prominent part 
of the whole surface, while at the same time the tooth of Simathormm is less fan- 
shaped. The corresponding tooth of Rgdasyitheriwm leiitognatlms is absolutely 
taller and narrower than the present sirecimen, wliich alone would be a sufficient 
distinction. I have given below the dimensions of the last lower premolars of 
the three lower jaws; the tooth of 8 . giganteimn is rather more worn down than 
the others, and therefore is proportionally somewhat squarer— 
Siv. 
H. lepto. 
J£. grande. 
In. 
In, 
In. 
Widtli of dorsum of last premolar 
1-40 
1-05 
1-3 
Height of „ „ ... 
1*72 
1*60 
1-4 
The other dimensions of the specimen arc as follows 
; - 
Leu gill of four last teeth .... 
7-7 
Depth at middle barrel of last molar 
3-7 
„ at hind baiTcl of first molar 
, 
3'7 
Prom the above comparisons, it is quite evident that the sjsccimcn cannot 
belong to Sivathorinm or to 11. leptognathus ; the size of the S25ecimen, ajiart from 
other characters, distinguishes it from Bramathermm and Vislimdlianivm. The 
specimen, being as large as the jaw of II. leptogmdlais, for the same reasons .can¬ 
not belong to II. megaceplial'um. 
There only remains therefore JZ. grande to which the specimen can belong; 
now, in the flatness of the dorsa of the molars of the qiresent specimen, as well 
from their obliquity to the long axis of the jaw, these teeth agree with the upper 
molars referred to above as foiming the now species II. grande; the size of the 
upper and lower molars also agrees well together, and I have accordingly thought 
it extremely probable that the two belong to the same animal. I •wi.sh it, however, 
to be understood that I cannot bo certain in this identification, and that it may 
subsequently bo necessary to refer the lower jaw to a new species or even to a 
now gomrs. 
The animal to which this jaw belonged was doubtless of the massive typo 
of Sirathcrimn, and therefore widely distinguished from the slcnder-jawed II. 
Icplognathus and the true Griralfos ; in the form of its teeth the animal was nearer 
to the former sjiecios, though it diverged still more widely in the form of the 
inner smfaccs of the molars from Sivathermm and the Giraffes. 
The only other specimen among the collection of teeth of Sivathcrioid and 
GiT'alToid animals is a last tower milk-molar of the left side; this specimen I 
cannot witli any coTitidence refer to any particular species, and I here merely 
