The skull elongate, forehead flat. The palate concave, deep, with a thickened margin on each side in front, widest in the middle part of the tooth-line, and gradually narrowed behind the teeth; the internal nares oblong, longer than broad, truncate in front, the front edge in a line with the orbital process of the zygomatic arch. Grinders large, compressed; the fifth and sixth upper behind the back edge of the zygomatic arch. The grinders have compressed roots; some of them have a very indistinct longitudinal groove on the side; the fifth upper grinder has two distinct roots. The ear-bones scarcely prominent, with a flat lower surface. Flap of toes moderate. I have not seen an adult skull of this genus. The skulls described are 10 inches long, but the bones are not knit (see Cat. S. & W. p. 47, f. 17). Arctocephalus § II., _Gray_, _Proc. Zool. Soc._ 1859, p. 109. Phocarctos, _Gray_, _Ann. & Mag. N. H._ 1866, vol. xviii. p. 234. Otaria (part.), _Allen_, _Bull. Mus. Comp. Zool._ ii. p. 44. 1. Phocarctos Hookeri. _The Southern Hair-Seal._ B.M. Fur brown-grey, slightly grizzled, pale, nearly white beneath; hairs short, close-pressed, rather slender, flattened, black, with whitish tips, the tips becoming longer on the under part of the sides; feet reddish or black; whiskers black or whitish. Young pale yellow, varied with darker irregular patches; length 18 inches. B.M. Arctocephalus Hookeri, _Gray_, _Zool. Erebus and Terror_, t. 14, 15 (skull); _Cat. Seals B. M._ p. 45. f. 15; _P. Z. S._ 1859, pp. 109, 360, _Cat. Seals and Whales B. M._ pp. 53, 54. Arctocephalus falklandicus, _Burmeister_, _Ann. & Mag. N. H._ 1866, xviii. t. 9. f. 1, 2, 3, 4 (skull only). Otaria (Phocarctos) Hookeri, _Peters_, _Monatsb._ 1866, pp. 269 & 671. Phocartos Hookeri, _Gray_, _Ann. & Mag. N. H._ 1866, vol. xviii. p. 234 (the Hair-Seal of the sealers). Otaria jubata (part.), _Allen_, _Bull. Mus. Comp. Zool._ ii. p. 45. Young or albino? entirely cream-coloured, about 2 feet long. Eared Seal, _Pennant, Quad._ ii. p. 278. Phoca flavescens, _Shaw, Gen. Zool._ i. p. 200, t. 73 (from _Pennant_). Inhab. Falkland Islands and Cape Horn. Pennant, in his ‘Quadrupeds,’ describes an Eared Seal, rather more than 2 feet long, the whole body of which was covered with longish hair of a whitish or cream-colour; it was brought from the Straits of Magellan, and preserved in Parkinson’s Museum on the south side of Blackfriar’s Bridge (see “Eared Seal,” Pennant’s Quad. ii. p. 278). Dr. Shaw, in his ‘General Zoology,’ gave the name of _Phoca flavescens_ to this species, and figured it (i. p. 260, t. 73). This is very probably the young of the Hair-Seal of the Falklands, described by me as _Arctocephalus Hookeri_, which is of a pale-yellowish colour. Pennant does not mention the want of the under-fur.