THE SILURUS GLANIS. 177 
parts of Australia to Europe, would not have been so 
chimerical, if the persons who entertained it had only 
been able to fix upon such a fish, But the ichthyology 
of Australia is at present in its infancy, only a small 
proportion of the species being known, much less their 
habits. Not less than five different kinds of fish, as 
distinct as perch, burbot, and pike, were brought over 
under the name of “ Murray Cod.” The promoters of 
the experiment of introducing the salmon into Australia 
do not appear to be aware that they have there al- 
ready salmonoids as nearly akin to the European 
kinds as we can expect in two countries so remote 
from each other. As long as our knowledge of Aus- 
tralian fish is so incomplete, I cannot believe that the 
time has arrived when we may look for successful 
additions to our fauna from the Southern Hemisphere. 
Thus we ought to limit ourselves to the fresh- 
water fish of temperate Europe and America, but it 
is surprising how small is the number of such kinds 
which are not naturally indigenous to Great Britain. 
For leaving aside valueless fish, we find that all the 
genera occurring in Europe and North America— 
salmons, salmon-trouts, trouts, chars, vendaces (Core- 
goni, whitings), perches, burbots, eels, etc.—are repre- 
sented in Great Britain, so that the forms found on 
the Continent and in North America can be considered 
as merely local races, which, if they could be trans- 
planted, might deteriorate, or at all events yield no 
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