214 THE STORY OF THE BIRDS. 
are grown together without a web, go on to (80) and 
(81); if shank is sharp in rear, toes unwebbed, go at 
once to (47). 
(2) But if your bird belongs to any group of the 
order of Divers, its legs will be set far back, its toes 
membraned for swimming, its bill not fringed or 
toothed, and it will sit upon its tail, which is very short, 
and in the grebes absent. They are called Pygapodes 
because of this sitting posture when they stand. 
(8) If the wing is finlike, its feathers scaly, it is a 
Prneuin. If wing ordinarily feathered and useful, 
but sometimes rather short, the bird may be— 

a. Foot of a grebe. 6. Foot of a loon. ¢. Foot of an auk. 
(4) First, with three toes only, an Aux form; 
with four toes it is, 
(5) Second, a Gress, if toes are simply lobed 
(and no tail); and 
(6) Third, a Loon, if the toes are webbed. 
(7) Now, possibly the bird is not as at paragraph (2). 
Its legs may be a little far back, but its beak is fringed, 
or there are other peculiarities. So we pass on. 
