The most striking character of this fauna is the reappearance of types inhabiting the corresponding latitudes of the Northern Hemisphere, and not found in the intervening tropical zone. This interruption of the continuity in the geographical distribution of Shore-fishes is exemplified by species as well as genera, for instance--_Chimæra monstrosa_, _Galeus canis_, _Acanthias vulgaris_, _Acanthias blainvillii_, _Rhina squatina_, _Zeus faber_, _Lophius piscatorius_, _Centriscus scolopax_, _Engraulis encrasicholus_, _Clupea sprattus_, _Conger vulgaris_. Instances of genera are still more numerous--_Cestracion_, _Spinax_, _Pristiophorus_, _Raja_; _Callanthias_, _Polyprion_, _Histiopterus_, _Cantharus_, _Box_, _Girella_, _Pagellus_, _Chilodactylus_, _Sebastes_, _Aploactis_, _Agonus_, _Lepidopus_, _Cyttus_, _Psychrolutidæ_, _Notacanthus_; _Lycodes_, _Merluccius_, _Lotella_, _Phycis_, _Motella_; _Aulopus_; _Urocampus_, _Solenognathus_; _Myxine_. Naturally, where the coasts of the tropical zone are continuous with those of the temperate, a number of tropical genera enter the latter, and genera which we have found between the tropics as well as in the temperate zone of the Northern Hemisphere, extend in a similar manner towards the south. But the truly tropical forms are absent; there are no _Squamipinnes_, scarcely any _Mullidæ_, no _Acronuri_, no _Teuthyes_, no _Pomacentridæ_ (with a single exception on the coast of Chili), only one genus of _Julidina_, no _Scarina_, which are replaced by another group of Pharyngognaths, the _Odacina_. The _Labrina_, so characteristic of the temperate zone of the Northern Hemisphere, reappear in a distinct genus (_Malacopterus_) on the coast of Juan Fernandez. The family of _Berycidæ_, equally interesting with regard to their distribution in time and in space, consists of temperate and tropical genera. The genus by which this family is represented in the southern temperate zone (_Trachichthys_) is much more nearly allied to the northern than to the tropical genera. The true _Cottina_ and _Heterolepidina_ (forms with a bony stay of the præoperculum, which is generally armed) have not crossed the tropical zone; they are replaced by fishes extremely similar in general form, and having the same habits, but lacking that osteological peculiarity. Their southern analogues belong chiefly to the family _Trachinidæ_, and are types of genera peculiar to the Southern Hemisphere. The _Discoboli_ of the Northern Hemisphere have likewise not penetrated to the south, where they are represented by _Gobiesocidæ_. These two families replace each other in their distribution over the globe. Nearly all the _Pleuronectidæ_ (but they are not numerous) belong to distinct genera, some, however, being remarkably similar in general form to the northern _Pleuronectes_. With Gadoids _Myxinidæ_ reappear, one species being extremely similar to the European Myxine. _Bdellostoma_ is a genus peculiar to the southern temperate zone.