_Lota maculosa_, Burbot 539 _Enchelyopus cimbrius_, Four-bearded Rockling 539 _Merluccius productus_, California Hake 540 _Coryphænoides carapinus_, showing leptocercal tail 540 _Cælorhynchus carminatus_, Grenadier 541 _Steindachnerella argentea_ 541 _Lophius litulon_, Anko or Fishing-frog 545 _Cryptopsaras couesi_ 547 _Ceratias holbolli_, Deep-sea Angler 548 _Caulophryne jordani_ 548 _Pterophryne tumida_, Sargassum-fish, one of the Anglers 549 _Antennarius nox_, Fishing-frog 550 Shoulder-girdle of a Batfish, _Ogcocephalus radiatus_ 551 _Antennarius scaber_, Frogfish 551 _Ogcocephalus vespertilio_ 552 _Ogcocephalus vespertilio_, Batfish 553 _Ogcocephalus vespertilio_, Batfish 553 ERRATA[1] VOL. II Page xviii, line 7, for _Ophicæphalus_ read _Ophicephalus_ xviii, " 37, for _Mononactylus_ read _Monodactylus_ xix, " 33, for _Trachicephales_ read _Trachicephalus_ xx, " 37, for _Regaleaus glesneacsanius_ read _Regalecus russelli_ xxi, " 2, for _Etopus_ read _Etropus_ xxi, " 35, for _Zoacres_ read _Zoarces_ 1, " 7, _for_ jaws _read_ jaw 14, " 9, _for_ hetercoercal _read_ heterocercal 136, " 3, for _Evermannellus_ read _Evermannella_ 170, " 11, _for_ the fin _read_ the dorsal fin 171, " 10, _for_ have _read_ has 303, legend, _for_ Lacepède _read_ Lacépède 307, line 14, _for_ vertebrate _read_ vertebral 311, " 12, not clearly stated. The air-bladder is least developed in those species which cling closest to the bottom of the stream 350, legend, for _Apomotes_ read _Apomotis_ 355, line 18, _for_ ours _read_ our 357, " 14, _for_ chætodon _read_ Chætodon 358, " 17, for _Scriænidæ_ read _Sciænidæ_ 360, " 14, for _Percesoces_ read _Percesoces_ 409, " 16, for _naseus_ read _Naseus_ 419, " 23, _for_ of the generic of this group _read_ separating the group into genera 440, " 17, _for_ Chinnook _read_ Chinook 459, " 24, _for_ but the most _read_ but most