_Gadidæ_, _Ophidiidæ_, and _Macruridæ_ are very numerous, ranging through all depths; they constitute about one-fourth of the whole deep-sea fauna. Of _Physostomi_, the families of _Sternoptychidæ_, _Scopelidæ_, _Stomiatidæ_, _Salmonidæ_, _Bathythrissidæ_, _Alepocephalidæ_, _Halosauridæ_, and _Murænidæ_ are represented. Of these the _Scopeloids_ are the most numerous, constituting nearly another fourth of the fauna. _Salmonidæ_ are scarce, with three small genera only. _Bathythrissidæ_ include one species only, which is probably confined in its vertical as well as horizontal range; it occurs at a depth of about 350 fathoms in the sea of Japan. The _Alepocephalidæ_ and _Halosauridæ_, known before the “Challenger” expedition from isolated examples only, prove to be true, widely-spread, deep-sea types. Eels are well represented, and seem to descend to the greatest depths. _Myxine_ has been obtained from a depth of 345 fathoms. It will be useful to append a complete list of Deep-sea fishes, with the depths as ascertained by the dredgings of the “Challenger:”-- _List of Deep-sea Fishes._ Fathoms. CHONDROPTERYGIANS-- Raja 565 Scyllium 400 Centroscyllium 245 Centrophorus 345–500 ACANTHOPTERYGIANS-- Pomatomus (? down to) 200 Sebastes 275 Setarches 215 Beryx 345 Melamphaes (? beyond) 200 Polymixia 345 Nealotus Nesiarchus Aphanopus Euoxymetopon Lepidopus 345 Gempylus Anomalops ? Antigonia Diretmus Cottus 565 Bathydraco 1260 Oneirodes Melanocetus johnsonii 1850 „ bispinosus 360 Himantolophus Chaunax 215 Ceratias 2400 Halieutichthys Dibranchus 360 Trachypteridæ Lophotes Notacanthus rissoanus 1875 „ bonapartii 400 ANACANTHINI--