Genus — C ALLOCORYDON. 
Callocorydon, noy. 
Callocephalon Lesson, Journ. aut Globe “ Thetis,” 
Type G . fimbriatus . 
Vol. II., p. 311, 1837 
Type 0. fimbriatus. 
Also spelt — 
Catticephalus Agassiz, Nomencl. Zool. Ind, Univ., p, 168, 1848, 
Collocephalon Bonaparte, Comptes Rendus Sci. (Paris), Vol. XXX., p. 138, 1850, 
Callocephalus Gerbe, Diet. Univ. d’Hist. Nat., Vol. IX., p. 641, 1861. 
CaUocephala Reichenow, Journ. fi r Orn., 1881, p. 31. 
Callocephalum, Mathews Handl. Birds Austral., p. 47, 1908. 
Not Calocephalus F. Cuvier, Diet. Sci. Nat. (Levrault), Vol. XXXIX., 
p. 544, 1826. 
Corydon (not Lesson, 1828), Wagler Abhandl. Ak. 
Wissen. Munch., Vol. I., p. 504, 1832 . . Type C . fimbriatus. 
Medium Kakatoeine birds with peculiar crest, short heavy bill, long wings, 
long tail and small legs and feet, and peculiar coloration. 
The distinctive characters of the genus are the crest formation and 
colour. 
The crest is composed of feathers which rapidly become recurved and 
erect and are more or less disintegrated in texture, differing altogether from 
the crests of all the other Cockatoos. 
The bill is short, stout and heavy, sharply hooked with the under edge 
of the upper mandible sinuate ; the culmen narrowly rounded ; the under 
mandible is massive with a broad rounded face and the sides nearly straight. 
The height of the bill is about twice its breadth. The under-mandible has 
the edges nearly straight, but a sinuation precedes the tip at each side while 
there is a deep sinus between the tips, leaving these as angular tooth-like 
projections. 
The cere is feathered, the nostrils hidden, while the lores are only sparsely 
feathered. 
The wing is long with the first primary shorter than the fifth, the third 
being longest, the second and fourth a little shorter and subequal ; the first 
four primaries are scalloped on their inner webs for half their length. 
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