14S 
TRICOLOUR-CRESTED COCKATOO. 
Plyctolophus Leadbeateri. — Vigors. 
PLATE XIII. 
Plyctolophus Leadbeateri, Vigors, Philos. Mag. 1831 p. 55. 
Lear's Parrots . — Cacatua Leadbeateri, Wag. Mon. Psitl. 
in Abhand. 692, sp. 3. 
Distinguished by its tricoloured crest of scarlet, 
yellow, and white, composed, like that of the other 
Cockatoos, of long acuminate feathers, with the tips 
directed forwards, and which can be erected and ex- 
panded like a fan, or depressed at the pleasure of 
the bird. It is a native of Australia, and was first 
made known and described from a specimen which 
came into the possession of Mr Leadbeater, well 
known to ornithologists, and whose name Mr Vigors 
has selected for its specific title. In size it fully 
equals, or perhaps a little exceeds, the lesser Sulphur- 
crested Cockatoo. The bill is of a pale greyish- 
white ; the upper mandible strongly sinuated and 
toothed ; the irides of a deep brown ; the naked or- 
bits whitish. The feathers at the immediate base of 
the bill are crimson, forming a narrow band or fillet ; 
those of the forehead are white, tinged with red. 
