TURN-STONE. 
35 
hind toe standing inwards, and all of the toes edged with a thick 
warty membrane. The male and female are alike variable ; and 
when in perfect plumage nearly resemble each other. 
Bewick, in his History of British Birds, has figured and de- 
scribed what he considers to be two species of Turn-stone ; one of 
which, he says, is chiefly confined to the southern, and the other 
to the northern parts of Great Britain. The difference, however, 
between these two appears to be no greater than commonly occurs 
among individuals of the same flock, and evidently of the same 
species, in this country. As several years probably elapse before 
these birds arrive at their complete state of plumage, many varie- 
ties must necessarily appear, according to the different ages of the 
individuals. This is the only species of the genus Strepsilas at 
present known to naturalists. It is found in almost every quarter 
of the world. 
