Contents: Preface; Introduction; Muscles and Electric Organs; Electric Organs of Teleosts; Respiratory Role of Gill; Holobranchs; Non-Respiratory Role of Gill; Chloride Cells; Swim Bladder; Excretion and Osmoregulation in Teleosts; Neurasecre tion and Endocrine Secretion in Teleosts; The Lateral Line System of Teleosts and its Innervation; Fish Classification Schemes; Placoderms and Other Early Gnathostomes; Crossopterygians; Dipnoi (Lungfishes); Index.