CONTENTS. 



Page. 



Introduction S 



Material and methods S 



Structure and distribution of chromatophores and guanophores 6 



Development and degeneration of chromatophores 8 



Changes in distribution of pigment in chromatophores lo 



Innervation of chromatophores 12 



Detailed study of chromatophores and guanophores in skin of fish on given backgrounds 13 



Introduction 13 



Fish newly taken 14 



Fish on black background 15 



Fish on white background 16 



Fish on yellow background 18 



Fish on green background 20 



Fish on red background 21 



Fish on blue background 23 



Discussion 24 



Summary 25 



Bibliography 26 



Explanation of plates 29 



3 



