XVI. _A. labyrinthibranchii_ 514 Families: Labyrinthici (Climbing Perch, Gourami), 514--Luciocephalidæ, 519. XVII. _A. lophotiformes_ 519 Family: Lophotidæ, 519. XVIII. _A. tæniiformes_ 520 Family: Trachypteridæ (Ribbon-fishes), 520. XIX. _A. notacanthiformes_ 523 Family: Notacanthidæ, 523. SECOND ORDER--ACANTHOPTERYGII PHARYNGOGNATHI 523 Families: Pomacentridæ (Coral-fishes), 524--Labridæ (Wrasses, Parrot-wrasses), 525--Embiotocidæ, 533--Chromides, 534. THIRD ORDER--ANACANTHINI 537 I. _A. gadoidei_ 537 Families: Lycodidæ, 537--Gadidæ (Cod-fishes, Hake, Burbot, Ling, Rockling, Torsk), 539--Ophidiidæ (Brotula, Fierasfer, Sand-eel, Congrogadus), 546--Macruridæ, 551. II. _A. pleuronectoidei_ 553 Family: Pleuronectidæ (Flat-fishes), 553. FOURTH ORDER--PHYSOSTOMI 559 Families: _Siluridæ_; their skeleton, 559--divided into eight subdivisions and sixteen groups; Clariina, 563--Plotosina, 563--Silurina, 565--Hypophthalmina, 566--Bagrina, 567--Amiurina, 567--Pimelodina, 568--Ariina, 569--Doradina, 572--Rhinoglanina, 573--Malapterurina (Electric Catfish), 574--Hypostomatina (Preñadillas, Loricaria, etc.), 575--Aspredinina, 580--Nematogenyina and Trichomycterina, 581--Stegopholina, 581. Families of Physostomi continued: Scopelidæ, 582--_Cyprinidæ_ (Carps), 587--divided into fourteen groups, viz. Catostomina (Suckers), 588--Cyprinina (Carp, Crucian Carp, Gold-fish, Barbels, Gudgeons), 589--Rohteichthyina, 596--Leptobarbina, 597--Rasborina, 597--Semiplotina, 598--Xenocypridina, 598--Leuciscina (White fish, Tench, Dace, etc.), 598--Rhodeina, 601--Danionina, 601--Hypophthalmichthyina, 602--Abramidina (Bream, Bleak), 602--Homalopterina, 604--Cobitidina (Loaches), 604. Families of Physostomi continued: Kneriidæ, 606--Characinidæ, 606--Cyprinodontidæ, 613--Heteropygii (Blind Fish of the Mammoth Cave), 618--Umbridæ, 619--Scombresocidæ (Gar-pike, Saury, Half-beak, Flying Fish), 619--Esocidæ (Pike), 623--Galaxiidæ, 624--Mormyridæ, 625--Sternoptychidæ, 627--Stomiatidæ, 629.