137 
FULIGULINrE. 
What we have now endeavoured to describe, con- 
stitute all the members of the Anatinas or River 
Ducks which have been met with in our islands. 
We have next to examine the truly Aquatic or Sea 
Ducks, indicated as a sub-family by the appellation 
in our title ; they are almost all entirely maritime in 
their habits, almost living on the sea, procuring all 
their food, which consists chiefly of fishes, by diving; 
they are all extremely shy and wary ; a few genera 
retire to the brooks and fresh-water lakes to breed, 
and sometimes select a hollow tree for a nestling- 
place, such as Fuligula, Clangula &c., and these also 
in severe winters ascend rivers, where, in Britain, 
they find abundance of food in the young or smaller 
salmonidm and cyprinid;e, or on the shallow streams 
where the spawn has been deposited. They are 
subject to periodical change of plumage, in finest 
perfection during spring ; but the changes have not 
been so well ascertained as in the members of the 
last sub-family. 
Fuligula, Ray. — Generic characters. — Bill of 
middle length, broad, depressed towards the 
point, where it is rounded and slightly dilated ; 
laminae broad, concealed by the deflected edges 
of the maxilla; nostrils basal, oblong, rather 
