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largely made up of their debris. Such evidence is so immutable to the 
geologist, and, when on so grand a scale, entails such grave consider- 
ations of time, that I presumed to call in question the one published 
statement (in Vol. III. p. 527 of the J. A. S. B. for 1834) of 
vertebrate Sivalik fossils having been found within the area of the 
older groups, not having myself succeeded in re-discovering fossils at 
the locality indicated. My scepticism was of course based upon the 
a prior? consideration of geological time ; and because, as I state at 
p- 105 of my Memoir, no corresponding distinction has as yet been 
suspected by the authors of the Mauna Sivalensis. I made due 
attempts to authenticate the observation which I had called in question 
by referring to the original discoverers; as, however, in every reply 
I received, there was some trace of ambiguity, not wishing to give 
further trouble to my correspondents, I published the whole case in 
its unsettled form, giving full directions for the application of the 
verdict on either side (see pp. 15, 16, 104—6, of my Memoir). 
I have now-the pleasure to announce this verdict ; and, notwithstand- 
ing the precaution I took to provide for its application, the fact cannot 
well be stated without a few words of explanation. 
Ina letter dated the 16th July, 1864, Sir Proby Cautley tells me that . 
he has himself collected fossils on the north side of Nahan 7. e. in the 
rocks of my middle group, the same in every respect as those he 
had found more abundantly at the south base of the Sivalik hills, east 
of the Jumna. The peculiar mode of occurrence of these fossils in 
the nodular clays (‘ clay-conglemerate’ of Cautley), as compared with 
those found in the coarse gravel deposits, could not escape observation. 
The former were all small and fragmentary. Large masses of the clay 
had to be carted from the hills and broken up at leisure in search of 
the fossil remains. I need scarcely, however, state that the Sivalik 
fossils have hitherto been given and received as one undivided fauna, 
Every one interested in these subjects will join in the regret expressed 
by Sir Proby Cautley that it is now impossible to work the question out, 
unless upon fresh materials. He informs me that the large collection 
of these smaller fossils, sent by him with the others to the British — 
Museum, is now not to be found, if 
To paleontologists then, we may now announce that a most interest- 
ing case awaits their investigation, namely, the comparison of well 
