PART 4.J Waagen: Geographical distribution of fossil orgatiisms in India. 301 
demand closer consideration in order to appreciate justly what it has been at¬ 
tempted to,represent. Above all, it cannot be pointed out too frequently that 
the map, although intended to give a general fiicture of the distribution of 
the formations in India, has been constructed for the special purpose of showing 
the distribution of the sea and the continents during the mesozoic period, and 
that for this reason a number of the jmunger superficial formations have been 
omitted entirely, specially all alluvia (with exception of the abnormally exten¬ 
sive alluvia of the Ganges and Brahmaputra), also the latcrite, which is developed 
to such great thickness and extent, and further the nrammaliferous gravels of the 
Deccan, and the Cuddalore sandstone, etc. The eruptive formations, excepting 
the so-called Deccan trap, have been everywhere neglected ; and even the small 
outlier of Deccan trap which in Rajahmundry district encloses brackish water 
nummulitic beds and rests itself upon presumably cretaceous rocks, had to bo 
omitted because of the small scale of the little map. The great space indicating 
the wide extension of the Siwalik beds in and to the noi'th of the llajputana 
desert is intended more to point out the probable once existing extension of the 
fresh-water lake in which those beds -were deposited than to show the outcrop 
of rocks actually observed, as no reliable observations were available from this 
part of India. 
The two types of development existing within the limits of the mesozoic 
deposits have been indicated by stippling, in order to show at a single glance 
the distribution of the marine formations and the deposits formed in inland 
basins. 
A similar distinction has been applied to the palfsozoic formations, without 
wishing, however, to distinguish positively here between marine and inland- 
water beds. 
The crystalline formations shown in the map include probably a great 
period of time, and the boundary between them and the palarozoic beds is very 
fluctuating, so that many of the formations on the boundary are locally reckoned 
sometimes to the former, sometimes to the latter series. According to tlio ac¬ 
counts now existing, it is hardly possible here to draw the boundary adequately 
in every case. 
The continental boundaries laid down with dotted and broken lines have been 
explained sufficiently in the foregoing pages. 
We may now expect soon to I’oceivo further details bearing on the geological 
representation of India from W. T. Blanford’s official map of India, which is 
now in the press. I wish further only to remai’k that this essay with its map 
had been completed by mo long before I received the first tidings of Blanford’s 
intended publication, and that its presentation to the Imperial Academy of 
Science was only delayed by circumstances which it was not in my power to 
control. 
