BIRDS. 
PLATE IX, 
The head of the Adélie Penguin (Pygoscelis adeliw). Fig. 1, a day or two after 
emerging from the egg, with the angular pseudo egg-scale on the upper bill; fig. 2, 
about a fortnight old ; fig. 3, shedding the downy plumage; and fig. 4, in the plumage 
of the first year, with white throat and blackish bill and eyelids; fig. 5 represents the 
head of a normal adult ; and fig. 6, that of an isabelline variation, with the occipital 
crest raised and the eyes staring, as they appear in this species whenever it is angered or 
excited. ‘ 
