100 
Records oj ihe Gcokyicul Huney of India. [voL. xi. 
iu 11. primujeniii the two first lower molars are of equal length. The molars of 
II. venusta are very large, and the folds simpler than in our specimen. 
The Indian fossil cannot, therefore, be referred to any named species with 
which I am acquainted, and I propose therefore to call it E. sivalensis. 
Grenus : Rhizomts, nov. sp. (?). 
From certain beds at the village of Jabi in the Punjab, which Mr. Theobald 
classes as middle Siwalik, I have received two detached rami of the mandible of 
an apparently new Rodent. Each of these rami contains three molai's and no 
promolar; these molars have a single deep enamel fold on the outer side, and 
three smaller folds on the inner side, which are well apparent in the worn teeth ; 
the last molar is longer than the penultimate ; the molars have distinct roots ; and 
the jaw is stout and has well-marked ridges for muscular attachments. The 
length of the three molars is 0'6, and the depth of the jaw at the second molar 
0-5 inch. 
lo determine the group of Rodent.s to which these jaws belong I have made 
use of the classification of the Order Undeidia or Glires published by Mr. Alston 
in the “Proceedings of the Zoological Society of London” for 1876. From that 
memoir the following facts may be gathered as to the number and form of the 
lower molar teeth in this order :— 
In the Sub-orders Gtlires Duplicidentati and G. Hbbetidextati there are 
always premolars. 
In the Sub-order Glires Simplicidbntati, the Sections Sciuromorpha and 
IIystricomorpha always have premolars. In the remaining Section, Mtomorpha, 
promolars may or may not be present. It is therefore clear that our specimens 
can only belong to this last section. 
In this section, the families Myoxidm, Geoviijidoi, and TJieridomijIdai always 
have pi’emolars. The families Syalackhe and DipoiUdce may or may not have 
(>remolars, while the families Jjophioiiiyidis and Mnrldcc never have premolars. 
It is therefore evident that our specimens can only belong to one of the last 
four families. 
Now, in the throe last-mentioned families the molars arc always either tubor- 
culate, or carry more or less transverse ridges, and never have external or internal 
enamel infolds. It is, therefore, clear that our specimens cannot belong to either 
of those families, and they can, therefore, only belong to the remaining family, 
Upalacvlm. This family is divided into two sub-families the Spalnakim and the 
JjidhyBrginm ; the latter group has always promolars, while the former lacks them : 
our specimens can, therefore, only belong to the former. 
The sub-family SyalaouiKn contains three well-known living genera, namely, 
SpakhV, lildsomys and Eeteroaeplndus ; of these, the molars of Spalax are distin¬ 
guished from those of the present specimens by having very slight enamel folds, 
which exist only in the almost unworn state ; the lower molar.s of lEteTooephciliis 
are distinguished by having only a single inner and outer fold. (Alston.) 
I liorc now remains only the genus Tthtsomijs to which our specimens can 
belong; the lower molars of that genus are characterized by having a largo 
