It is with feelings of great pleasure that I find that the term _Banksii_, having the priority, the name of the illustrious Banks, will ever be retained as the distinctive appellation of this noble and ornamental bird; and I would that it were in my power to write as many pages respecting its habits and economy as I have lines; but this task must devolve upon some future historian of the productions of a country teeming with the highest interest, and who will doubtless find occupation in investigating the minute details of that respecting which I am only able to give a general outline. The male has the entire plumage glossy greenish black, with a broad band of rich deep vermilion across the middle of all but the two central tail-feathers, and the external web of the outer feather on each side; feet mealy brown; bill in young specimens greyish white, in old specimens black. The female has the general plumage glossy greenish black, each feather of the head, sides of the neck and wing-coverts pale yellow; under surface crossed by narrow irregular bars of pale yellow, becoming fainter on the abdomen; under tail-coverts crossed by narrow freckled bars of yellowish red; tail banded with red, passing into sulphur-yellow on the inner margins of the feathers, and interrupted by numerous narrow irregular bars and freckles of black. The Plate represents the male and female about two-thirds of the natural size. [Illustration: CALYPTORHYNCHUS MACRORHYNCHUS: _Gould_. _Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] CALYPTORHYNCHUS MACRORHYNCHUS, _Gould_. Great-billed Black Cockatoo. _Calyptorhynchus macrorhynchus_, Gould in Proc. of Zool. Soc., Part X. p. 138. _Lȁr-a-wuk_, Natives of Taratong. All the examples of this species that have come under my notice have been collected at Port Essington, where it is usually seen in small troops of from four to six in number. It has many characters in common with the Black Cockatoos of the south coast, but no species of the genus yet discovered has the bill so largely developed, which development is doubtless requisite to enable it to procure some peculiar kind of food at present unknown to us; it assimilates to the _C. Cookii_ of New South Wales in the lengthened form of its crest, but differs in having much shorter wings, and in the mandibles being fully one-third larger. The females of the two species also vary considerably in the colouring of the bands across the tail-feathers, which in the _C. Cookii_ is pure scarlet, while the same part of the female of the present bird is mingled yellow and scarlet. It differs from the _C. naso_ of Western Australia in having a larger bill than that species, and in the much greater length of the crest; a similar difference is also observable in the colouring of the tail-feathers of the females that has been already pointed out with regard to _C. Cookii_.