The Descent of Man

the rest of the body being chestnut-brown, and
the male of this species is provided with three
filamentous projections half as long as the body—one
rising from the base of the beak, and
the two others from the corners of the mouth.
(75. Mr. Sclater, 'Intellectual Observer,' Jan.
1867. Waterton's 'Wanderings,' p. 118. See also
Mr. Salvin's interesting paper, with a plate, in
the 'Ibis,' 1865, p. 90.)
The coloured plumage and certain other ornaments
of the adult males are either retained for
life, or are periodically renewed during the
summer and breeding-season. At this same
season the beak and naked skin about the head
frequently change colour, as with some herons,
ibises, gulls, one of the bell-birds just noticed,
etc. In the white ibis, the cheeks, the inflatable
skin of the throat, and the basal portion of the
beak then become crimson. (76. 'Land and Water,'
1867, p. 394.) In one of the rails, Gallicrex
cristatus, a large red caruncle is developed du-