1. The small list of fishes which we can assign to the _Kamtschatkan_ district is due rather to the imperfect manner in which its fauna has been explored than to its actual poverty of fishes; thus, although we may be sure that sooner or later the small kinds of Dog-fishes of the British district will be found there also, at present we have positive knowledge of the occurrence of only two Chondropterygians, viz. _Chimæra_ and _Raja_. The species of the latter genus seem to be much less numerous than in the Atlantic. Of Acanthopterygians the following are known:--_Sebastes_; _Chirus_, _Agrammus_; _Podabrus_, _Blepsias_, _Cottus_, _Centridermichthys_, _Hemilepidotus_, _Agonus_; _Trichodon_; _Callionymus_; _Liparis_; _Dictyosoma_, _Stichæus_, _Centronotus_. Labroids are absent; they are clearly a type unable to endure great cold; of the Embiotocoids which represent them in the Pacific, one species only (a species of _Ditrema_) is known from this district. The Gadoids are, so far as we know at present, sparsely represented, viz. by isolated species of _Gadus_, _Motella_, and _Lotella_, the latter being an inhabitant of moderate depths rather than of the surface. _Hippoglossus_, _Pleuronectes_, and _Parophrys_, seem to occur everywhere at suitable localities. The Physostomes are nearly the same as in the British district, viz. a Smelt (_Hypomesus_), probably also the Arctic _Mallotus_, an Anchovy, several species of _Clupea_, and the Conger-eel. A very singular Salmonoid fish, _Salanx_, which is limited to the north-western Pacific, occurs in great abundance. Also, the Lophobranchs correspond in their development to those of the British district, _Nerophis_ being replaced by _Urocampus_. Neither Myxinoids nor _Branchiostoma_ have as yet been found.