
1865. ] Note relating to Sivalik Fauna. 63 
understood—not so in former times. This dark child a little darker 
than the others separates with a few more from the rest of the family 
and sojourns in a land where a hot sun embrowns them with a still 
deeper hue. In time they become blacker and blacker or browner and 
browner. Should they travel north instead of south, it is all the same ; 
for extreme cold produces the same effect as extreme heat! This is 
ancient and modern physiology !” 
PPALILLPP PL ALLA LD DDD PDD PDD DDD, 
Note relating to Sivalik Fauna.—By 1. B. Meputcorr. 
[Received 7th September, 1864. ] {Read 7th September, 1864. ] 
The notice I have to bring before the Society may be considered a 
continuation of a series of brief but important communications, com- 
menced more than thirty years ago, and continued during some twenty 
years, as recorded in the volumes of the Journal of the Asiatic Society 
for that period. Those communications formed a current chronicle of 
the discovery of the Fauna Sivalensis. Had the account of those 
discoveries ever assumed a more connected and complete form, the 
correction I have now to make, would never have been needed, as it is 
but the statement of a fact, of which the evidence was in hand and in 
mind, although never expressed. Indeed, for the same reason, this 
fact can now be only indicated, its value being still unknown. This fact 
is—the existence of two vertebrate faune, possibly quite distinct, 
among the fossils hitherto collected from the so-called Sivalik rocks. 
In a recently published number of the ‘Memoirs of the Geological 
Survey of India, Vol. III. Part 2, I have given a somewhat detailed 
account of the geology of the Sub-Himalayan region in North-West 
India. I therein established a threefold division of the great series of 
deposits coming under the general title of Sub-Himalayan. Concerning 
the lowest of these groups (Subathu, etc.) little or no  conflict- 
ing evidence presented itself. The two upper groups I described 
as in all respects more akin to each other, although still most 
clearly separable along a well marked boundary, at which the younger 
strata overlap the steeply denuded edges of the older, besides being 
