To this fauna we refer the shore fishes of the southernmost extremity of South America, from 50° lat. S., with Tierra del Fuego and the Falkland Islands, and those of Kerguelen’s Land, with Prince Edward’s Island. No fishes are known from the other oceanic islands of these latitudes. In the Southern Hemisphere surface fishes do not extend so far towards the Pole as in the Northern; none are known from beyond 60° lat. S., and the Antarctic Fauna, which is analogous to the Arctic Fauna, inhabits coasts more than ten degrees nearer to the equator. It is very probable that the shores between 60° and the Antarctic circle are inhabited by fishes sufficiently numerous to supply part of the means of subsistence for the large Seals which pass there at least some season of the year, but hitherto none have been obtained by naturalists; all that the present state of our knowledge justifies us in saying is, that the general character of the Fauna of Magelhæn’s Straits and Kerguelen’s Land is extremely similar to that of Iceland and Greenland. As in the arctic Fauna, Chondropterygians are scarce, and represented by _Acanthias vulgaris_ and species of _Raja_. _Holocephali_ have not yet been found so far south, but _Callorhynchus_, which is not uncommon near the northern boundary of this fauna, will prove to extend into it. As to Acanthopterygians, _Cataphracti_ and _Scorpænidæ_ are represented as in the arctic Fauna, two of the genera (_Sebastes_ and _Agonus_) being identical. The _Cottidæ_ are replaced by six genera of _Trachinidæ_, remarkably similar in form to arctic types; but _Discoboli_ and the characteristic Arctic Blennioids are absent. Gadoid Fishes reappear, but are less developed; as usual they are accompanied by _Myxine_. The reappearance of so specialised a genus as _Lycodes_ is most remarkable. Flat-fishes are scarce as in the North, and belong to peculiar genera. Physostomes are probably not entirely absent, but hitherto none have been met with so far south. Lophobranchs are scarce, as in the Arctic zone; however, it is noteworthy that a peculiar genus, with persistent embryonic characters (_Protocampus_), is rather common on the shores of the Falkland Islands. The following are the genera known from this zone. Those with a single asterisk (*) are known to extend into the Temperate zone, but not beyond it; those with a double asterisk (**) are limited to the Antarctic shores:-- Magelhæn’s and Falkland. Kerguelen.