Tribe 5. EUMETOPIINA. Grinders 5/5·5/5, more or less far apart; the hinder upper behind the hinder edge of the zygomatic arch, and separated from the other grinders by a concave space. 7. _Eumetopias._ Under-fur sparse. Flap of toes very short. West coast of North America. 8. _Arctophoca._ Under-fur abundant. Flap of toes long. West coast of South America. Sect. I. _The palate produced behind to a line even with the condyles. The palatine surface of the maxillaries extending behind the teeth and with its posterior processes very long. It is deeply concave behind, and becomes deeper as the animal increases in age. The hinder nostril is short, with a truncated front edge. Flap of toes rather long._ Sea-lions. Tribe I. _OTARIINA._ Otariina, _Gray_, _Ann. & Mag. N. H._ 1869, vol. iv. p. 269. 1. OTARIA. Grinders 6/5. In the adult skulls the fourth upper grinder is under the front edge of the orbit, and the sixth or last in a line with the back edge of the zygomatic arch. The hinder edge of the palate is rather in front, on the line of the condyles. The teeth in the younger skull are more lobed than in the adult; the upper grinders are also differently disposed; the third upper grinder is under the front edge of the orbit, and the fifth tooth is in a line with the back edge of the zygomatic arch, and the last or sixth tooth is far behind it (see skull, Cat. S. & W. p. 58, f. 18). This change is remarkable, as the teeth of the young and the adult _Zalophus Gilliespii_ are similar in number and position. Otaria (subg. Otaria), _Peters_, _Monatsb._ 1866, p. 263. Otaria, _Gray_, _Cat. Seals & Whales_, p. 57; _Ann. & Mag. N. H._ 1866, vol. xviii. p. 230; _Gill_, and _Peters_. Platyrhynchus, _F. Cuvier_. 1. Otaria jubata. _Sea-lion._ Fur dark brown; cheeks, temples, and sides of the forehead black; neck greyish brown; back of the neck yellow-brown; belly dusky black; hairs flat, tapering, dark brown, yellow, and whitish intermixed, without any under-fur. Sea-bear, _Illustrated London News_; _Boy’s Own Book_. Otaria jubata, _label in Zoological Gardens_, 1865; _Gray_, _Ann. & Mag. Nat. Hist._ 1868, i. p. 109; _Murie, P. Z. S._ 1869, p. 101, t. viii. (male, female, and young); _Abbott_, _P. Z. S._ 1868, p. 190; _Sclater_, _P. Z. S._ 1868, p. 528; _Peters_, _Monatsber_. 1866, p. 262. Otaria leonina, _Peters_, _Monatsb._ 1866, pp. 264, 665; _Gray_, _Cat. Seals & Whales_, p. 59, f. 18. Otaria Godeffroyi, _Peters_, _Monatsb._ 1866, p. 266, t. 1. Otaria Byronia, _Peters_, _Monatsb._ 1866, pp. 269 & 666. Otaria (Phocarctos) Ulloæ, _Peters_, _Monatsb._ 1866, p. 270. Otaria Ulloæ, _Tschudi_, _Fauna Peruana_, pp. 135, 136, t. vi. Otaria (Otaria) Ulloæ, _Peters_, _Monatsb._ 1866, pp. 667 & 671. Inhab. South America, Falkland Islands, Chili.