Basal Bone of Dorsal Fin, _Holoptychius leptopterus_ 49 Inner View of Shoulder-girdle of Buffalo-fish, _Ictiobus bubalus_ 51 _Pterophryne tumida_, Sargassum-fish. 52 Shoulder-girdle of _Sebastolobus alascanus_. 52 Cranium of _Sebastolobus alascanus_. 53 Lower Jaw and Palate of _Sebastolobus alascanus_. 54 Maxillary and Premaxillary of _Sebastolobus alascanus_. 55 Part of Skeleton of _Selene vomer_. 55 Hyostylic Skull of _Chiloscyllium indicum_, a Scyliorhinoid Shark. 56 Skull of _Heptranchias indicus_, a Notidanoid Shark. 56 Basal Bones of Pectoral Fin of Monkfish, _Squatina_. 56 Pectoral Fin of _Heterodontus philippi_. 57 Pectoral Fin of _Heptranchias indicus_. 57 Shoulder-girdle of a Flounder, _Paralichthys californicus_. 58 Shoulder-girdle of a Toadfish, _Batrachoides pacifici_. 59 Shoulder-girdle of a Garfish, _Tylosurus fodiator_. 59 Shoulder-girdle of a Hake, _Merluccius productus_. 60 _Cladoselache fyleri_, Restored. 65 Fold-like Pectoral and Ventral Fins of _Cladoselache fyleri_. 65 Pectoral Fin of a Shark, _Chiloscyllium_. 66 Skull and Shoulder-girdle of _Neoceratodus forsteri_, showing archipterygium. 68 _Acanthoessus wardi_. 69 Shoulder-girdle of _Acanthoessus_. 69 Pectoral Fin of _Pleuracanthus_. 69 Shoulder-girdle of _Polypterus bichir_. 70 Arm of a Frog. 71 _Pleuracanthus decheni_. 74 Embryos of _Heterodontus japonicas_, a Cestraciont Shark. 75 _Polypterus congicus_, a Crossopterygian Fish with External Gills. 78 Heterocercal Tail of Sturgeon, _Acipenser sturio_. 80 Heterocercal Tail of Bowfin, _Amia calva_. 82 Heterocercal Tail of Garpike, _Lepisosteus osseus_. 82 _Coryphænoides carapinus_, showing Leptocercal Tail. 83 Heterocercal Tail of Young Trout, _Salmo fario_. 83 Isocercal Tail of Hake, _Merluccius productus_. 84 Homocercal Tail of a Flounder, _Paralichthys californicus_. 84 Gephyrocercal Tail of _Mola mola_. 85 Shoulder-girdle of _Amia calva_. 86