INDIAN TERTIARY & POST-TERTIARY VERTEBRATA. 
SIWALIK MAMMALIA— SUPPLEMENT I. 
By R. LYDEKKER, B.A., F.G.S., etc. 
(WITH PLATES I. TO VI.) 
INTRODUCTORY. 
The present memoir contains descriptions and figures of the remains of three 
groups of Siwalik Mammals, which have either not been fully treated of in the 
preceding volumes of this work, or in which new species have been founded since 
such descriptions were written. 
The three groups here treated of comprise the Primates, the Antelopes, and 
the genus Merycopotamus. The first two groups u are of especial interest in regard to 
distributional zoology on account of their containing a large number of forms either 
definitely or provisionally referred to genera now characteristic of the Ethiopian 
region, 1 'which have not been hitherto found in the tertiaries of Europe. In the 
case of some of the fossil antelopes where the generic reference is provisional it is 
quite clear that these - species have no affinity to the numerically small antelopine 
fauna of modern India, and if they be not really generically identical with the 
Ethiopian forms with which they are grouped, they are evidently very closely 
allied, and probably indicate the source whence such genera took their origin. In 
other instances, however, there can be no doubt as to the generic identity of the 
Siwalik and Ethiopian forms . 2 It may be observed that since the Pikermi beds 
have yielded certain antelopes ( Palceoreas and Proiragelaphus ) allied to existing 
Ethiopian forms, it may be inferred that the ancestors of a considerable part of the 
existing Ethiopian fauna ranged over a large area of the Euro-Asiatic continent, 
but as none of the Pikermi antelopes (excepting the widely distributed Gazella) have 
1 Some of the existing baboons and antelopes of the Ethiopian also enter the adjacent parts of the Palsearetic region. 
2 In regard to the migration of Pliocene Siwalik genera into Africa see ‘ Quart. Joum. Geol. Soc.’ vol. XLII. p. 175 (1886). 
A 
