102 
^EA MONSTERS UNMASKED. 
Unfortunately, the estimated dimensions of this creature 
are not given. 
That negative evidence alone is an unsafe basis for argu- 
ment against the existence of unknown animals, the follow- 
ing illustrations will show : 
During the deep-sea dredgings of H.M.S. Lightnings 
Porcupine^ and Challenger^ many new species of mollusca, 
and others which had been supposed to have been extinct 
ever since the chalk epoch, were brought to light ; and by 
the deep-sea trawlings of the last-mentioned ship, there have 
been brought up from great depths fishes of unknown 
species, and which could not exist near the surface, owing 
to the distension and rupture of their air-bladder when 
removed from the pressure of deep water. 
Mr. Gosse mentions that the ship in which he made the 
voyage to Jamaica was surrounded in the North Atlantic, 
for seventeen continuous hours by a troop of whales of 
large size of an undescribed species, which on no other 
occasion has fallen under scientific observation. Unique 
specimens of other cetaceans are also recorded. 
We have evidence, to which attention has been directed 
by Mr. A. D. Bartlett, that *' even on land there exists at 
least one of the largest mammals, probably in thousands, 
of which only one individual has been brought to notice, 
namely, the hairy-eared, two horned rhinoceros {R. lasiotis), 
now in the Zoological Gardens, London. It was captured 
in 1868, at Chittagong, in India, where for years collectors 
and naturalists have worked and published lists of the 
animals met with, and yet no knowledge of this great beast 
was ever before obtained, nor is there any portion of one in 
any museum. It remains unique. 
I arrive, then, at the following conclusions: ist. That, 
without straining resemblances, or casting a doubt upon 
