164 
TODUS. 
and the tarsi, are three of the primary distinctions 
of the Fissiroslres and the Natatores. While the 
remarkably long legs of T. Platycircus* might lead 
us to believe it was the representation of the gralla- 
torial birds, but for its tail, which is twice the or- 
dinary length, and although unusually broad, yet 
the ends are pointed. The formation, therefore, of 
this member, stamps the bird at once as a rasorial 
type ; both these orders, in fact, have generally 
long legs, but it is only the Removes that have either 
broad tails or pointed feathers. We may, therefore, 
fairly conclude, that the species of Todus which 
represents the Grallatores has not yet been disco- 
vered, or rather that it has not yet fallen under our 
observation. 
The law of representation, although universal, is 
yet so simple, that if it is successfully demonstrated 
in any one group, it becomes equally established in 
all ; because all must be referred to one general 
test, that is, — to the primary types of nature. This 
has been so frequently exemplified in our treatise 
upon birds, and in that upon quadrupeds, that it 
becomes unnecessary to compare our present group 
with al bothers of the class or order to which it be- 
longs ; unless, indeed, there are • some points of 
structure to be elicited which cannot be explained 
by a single analogical comparison. Nevertheless, 
the views here taken of the particular group before 
* The only specimen of this species I have yet seen is in 
the Paris Museum. 
