ANALOGOUS TYPES. 103 
CHAPTER VII. 
ANALOGOUS TYPES. 
I come now to an obscure part of my subject, 
very difficult to present in a popular form, and 
yet so important in the scientific investigations 
of our day that I cannot omit it entirely. I al- 
lude to what are called by naturalists Collateral » 
Series or Parallel and Analogous Types. These 
are by no means difficult to trace, because they 
are connected by seeming resemblances, which, 
though very likely to mislead and perplex the 
observer, yet naturally suggest the association 
of such groups. Let me introduce the subject 
with the statement of some facts. 
There are in Australia numerous Mammalia, 
occupying the same relation and answering the 
same purposes as the Mammalia of other coun- 
tries. Some of them are domesticated by the na- 
tives, and serve them with meat, milk, and wool, 
as our domesticated animals serve us. Repre- 
sentatives of almost all types, Wolves, Foxes, 
Sloths, Bears, Weasels, Martens, Squirrels, Rats, 
etc., are found there; and yet, though all these 
