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Hippopotamus from the above cave, which had just cut the 
gum and had not had the fangs completed when the animal 
perished ; which proves, as Professor Owen observes, that, 
like the remains of the mammoth associated with them, 
they were of young inexperienced individuals, that had 
fallen into the clutches of the co-existing predatory car- 
nivora, which made that cave their lurking place, and per- 
fectly coincides with the conclusions which Dr. Buckland 
thus enunciates, — " That the facts developed in this charnel- 
house of the antediluvian forests of Yorkshire, demonstrate 
that there was a long succession of years in which the 
Elephant, Rhinoceros, and Hippopotamus had been the prey 
of the Hyaenas, which, like themselves, inhabited England in 
the period immediately preceding the formation of the dilu- 
vial gravel." 
That the above-mentioned large pachyderms, and other 
extinct animals, were cotemporary with the Hippopotamus in 
England, is also a fact clearly proved, as at Brentford, in 
Essex, at Durdam Down, near Bristol, as well as at Kirk- 
dale, the bones of the Elephant, Rhinoceros, Auroch, Bear, 
and Hyaena, were found associated with those of the Hip- 
popotamus. 
As regards the geological age of these remains, I shall 
venture but few remarks. It is generally supposed that the 
larger pachyderms, as well as the more ferocious carnivora, 
were inhabitants of the Yorkshire hills during the Pre-gla- 
cial period, that is, prior to the deposit of the diluvial gravel, 
&c, when they ceased to exist, leaving only the more peace- 
ful and domestic animals, as the Bovine and Deer tribe, to 
represent its former fauna. Such is the opinion of Pro- 
fessors Buckland and Phillips. It appears, however, very 
difficult to draw a satisfactory line of demarcation between 
these different periods, or, more correctly speaking, per- 
haps, to fix the life periods of the former inhabitants of 
this portion of our island ; inasmuch as if the Pre-glacial 
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