CALLOCORYDON. 
The tail is long, more than half the length of the wing, the feathers very 
broad. 
The feet are as usual in the family, the tarsus very short, thick and 
coarsely reticulate with small scales ; toes longer than the tarsus and claws 
of medium length. 
The coloration separates the genus, which is monotypic, from the White 
Cockatoos, and it has generally been associated with the dark species, but 
it appears to differ almost as much from those. The skeletal characters 
show certain differences in the skull and it may be that further osteological 
examination will show it to be less nearly related to the dark Cockatoos 
than is usually accepted. In the meanwhile it may be classed in the sub- 
family Calyptorhynchince, my reason being that the coloration somewhat 
recalls that of Zanda funerea in the immature state, and its range suggests 
that it is an ancient form and may be derived from the same stock 
as Zanda. 
I have altered the genus name Callocephalon on account of the prior 
C otocephalus. As there is apparently a distinction between these names, 
sufficient to allow both to stand, I give the following explanation. The 
International Commission have decided upon the item, “ errors of trans- 
literation ” in the recognition of their amendment. Consequently the 
above two names are identical when such errors have been corrected. I 
pointed out that it seemed a grave mistake to me that such a ruling should 
have been given as it was difficult to find students who agreed upon the 
amendment. The present case was not at that time before me, but it proves 
to be a most striking example. It seems agreed with the whole of the 
amenders that the double l should be preserved in Call, but while Lesson 
wrote Callo — and this was generally accepted — Agassiz, the purist, proposed 
Calli. It was undoubted that Lesson’s cephalon* referred to head, so Agassiz 
changed it right out to cephalus , the common transliteration. Salvin, 
among others, accepted this alteration but retained Lesson’s reading of Callo. 
Reichenow, in his effort at correcting the error of transliteration, preferred 
the feminine ending and therefore wrote cephala. In any case it has been 
ruled that the transliteration of Greek words ending in on should be in Latin 
w, so that we arrive at Callocephalum as I wrote in 1908. Whichever of 
these be correct, it must be conceded that Cuvier’s rendering of Calocephalus 
previously introduced must be brought into line, so that we have here a pure 
homonym. With regard to the alteration of Calo to Callo , we have in the 
present order the case of Calopsitta , also of Lesson, which has also been 
amended to Callipsittacus by the accurate Agassiz. 
* Lesson’s Vernacular lor his genus was “ calloc6phale.” 
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