_Diomedea gibbosa_, Gould in Ann. and Mag. of Nat. Hist., vol. xiii. p. 361. Face, ear-coverts, chin, abdomen, upper and under tail-coverts white; the remainder of the plumage very dark brown, approaching on the occiput, back of the neck and wings to black; bill yellowish horn-colour, becoming darker at the tip and at the base; feet in the dried specimen dark brown, but doubtless of a bluish grey, inclining to flesh-colour in the living bird. The above is the description of a specimen in the collection of the Zoological Society of London, to which it was presented by F. Debell Bennett, Esq., who had procured it in the North Pacific. It differs from every other that has come under my notice in the peculiar swollen and raised form of the base of the upper mandible, which moreover advances high upon the forehead. 585. Diomedea olivaceorhyncha, _Gould_. _Diomedea olivaceorhyncha_, Gould in Ann. and Mag. of Nat. Hist., vol. xiii. p. 361. I propose this name for a species, examples of which are wanting to our collections, and of which a bill only has as yet come under my notice. It is in the possession of Sir Wm. Jardine, Bart., is 3 inches and ⅜ths long from the gape to the tip, of a uniform olive-green, and in form more slender and elegant than that of the other members of the genus. The locality in which it was procured is not known, but it is supposed to have been obtained in the China seas. The last two species were not seen by me in the Australian seas, but are given in order to complete a monograph of the _Diomedeæ_. Genus PROCELLARIA, _Linn._ Of the fifteen species I have placed in this genus as now restricted, figures of only eight have been given. 586. Procellaria gigantea Vol. VII. Pl. 45. 587. Procellaria Æquinoctialis. 588. Procellaria conspicillata, _Gould_ Vol. VII. Pl. 46. 589. Procellaria hasitata, _Kuhl_. Vol. VII. Pl. 47. 590. Procellaria Atlantica, _Gould_. _Procellaria Atlantica_, Gould in Ann. and Mag. of Nat. Hist., vol. xiii. p. 362. Male: the whole of the plumage deep chocolate-black; bill and feet jet-black. This is one of the commonest species inhabiting the Atlantic, and no ship passes between our shores and the Cape of Good Hope without encountering it; it is a species respecting which very considerable confusion exists in the writings of nearly all the older authors. It is the _P. fuliginosa_ of Forster’s Drawings, No. 93 B, and the _P. fuliginosa_ of Lichtenstein’s edition of Forster’s MSS. p. 23, which term cannot be retained, as it had already been applied by Latham to a very different bird from Otaheite; it is the _P. grisea_ of Kuhl but not of Linnæus, who has given the term to another species, consequently _grisea_ cannot be retained for it; and hence I have been induced to give it a new appellation, and thereby prevent misapprehension for the future.