Orca stenorhyncha, _Gray_, _P. Z. S._ 1870, p. 71, figs. 1 & 3 (skull). Orca gladiator, _Gray_, _Cat. Seals & Whales_, p. 279. Inhab. North Sea. Skeleton from Weymouth, and a skull from the English coast. B.M. Intermaxillaries narrow in the middle and rather dilated in front; but the extent of dilatation varies in the two specimens. The examination of the four skulls of _Orca_ found on the English coast show they belong to two very distinct species, one with a much more attenuated beak than the other. B. _Beak of the skull spatulate; sides of the hinder half nearly parallel, of the front half arched and converging; end rounded, middle rather wider than at the notch._ Orca. 2. Orca capensis. (Figs. 8 & 10.) B.M. Orca capensis, _Gray_, _Cat. Seals & Whales_, p. 283; P. Z. S. 1870, p. 71, figs. 2 & 4. Delphinus orca, _Owen_. Grampus gladiator, _Smith_, _South-African Zool._ p. 126. Inhab. Cape of Good Hope (_Viney_, B.M.; _Villette_, Mus. Coll. Surg. no. 1139); Seychelles Islands (_Swinburne Ward_). In the Cape specimen the intermaxillaries are nearly of the same width in the whole of their length; in the Seychelles skull they are contracted in the greater part of their length, and rather dilated in front. Mr. Swinburne Ward has kindly sent a very beautiful skull of a “Killer” taken in the sea near the Seychelle Islands. To determine this skull I have been induced to compare the skulls of the genus in the British Museum, which it is very necessary to do from time to time, as specimens gradually accumulate, and often arrive when I am occupied on other subjects, and consequently are put aside for future examination. In this examination I have observed that in the ‘Catalogue of Seals and Whales’ I have confounded with the skull described under the name of _Orca capensis_ one from the North Pacific, the former being the true _Orca capensis_, and the skull now received from the Seychelles Islands being of the same species. The skull figured in the ‘Zoology of the Erebus and Terror’ under the name of _O. capensis_ is from a specimen received from the Zoological Society, to which it was presented by Capt. Delville, who said he obtained it in the North Pacific (?). It is quite a different species, for which I propose the name of _Orca pacifica_. I doubt its being from the _North_ Pacific, as I believe there is a skull of the same species in the Paris Museum, collected by M. Eydoux, and said to have come from Chili. 3. Orca africana. Orca gladiator, var. australis, _Gervais_, _Ostéogr. Cét._ t. 47. f. 2. Inhab. Algoa Bay. Skull much smaller, 24 inches long. 4. Orca latirostris. B.M. Orca latirostris, _Gray_, _P. Z. S._ 1870, p. 76. Orca gladiator, _Gervais_, _Ostéogr. Cét._ t. 48. f. 2, 3.