Contents: First Appearance of Fishes, The Skin, Origin of Fins, Digestive System, Blood Vascular System, Exchange of Gases, Removal of Nitrogeneous Wastes, Integrated System, Sense Organs, Multiplication System, Sense Organs, Multiplication System, Embryology, Hormonal Glands, Supportive System, Metachrosis in Fishes, Organs of Sound Production, Movement in Water, Adaptations in Fishes, Long Displacement.