Vol. XXXVIII. April, 1920. No. 4. BIOLOGICAL BULLETIN LIGHT PRODUCTION IN CEPHALOPODS, II. AN INTRODUCTORY SURVEY. S. STILLMAN BERRY, REDLANDS, CALIFORNIA. CONTENTS. PAGE 5. Color and Intensity of Light .............................. 6. Distribution of Photophores on Animal ................. i?4 On Eyeball ............................................... *75 In General Integument of Body ............................. i?6 On Mantle ............................................ i?6 On Head ................................... * 76 On Arms ................................... z 7 On Funnel ......................... : 77 Around Eye-openings ................ i?T On Fins ............................... Z 77 In Arms ........................... : 79 In Tentacles ........................ : 8o Intrapallial ................... l8 Anal ................ l81 Branchial ...................... . . 181 Gastric .................. . . 181 Axial ........................ l81 At Tip of Body ............... l82 7. Structure of Photogenic Organs .... l8 3 Diversity ..................... l8 4 Component Structures .............. l8 5 Duplex Organs ................. l8 5 8. Polymorphic Nature of Photogenic Organs. . 186 Genera with Isomorphic Photophores. . I 8 7 Genera with Dimorphic Photophores ............. l8 7 Genera with Trimorphic Photophores. . l8 7 Genera with Polymorphic Photophores. * 8 7 9. Systematic Significance of Photogenic Organs. . . 189 10. Probable Polyphyletic Origin of Photogenic Organs. 190 11. Concluding Note ....... I 9 I 12. Summary ................... 13. Literature ............. .................... : 93 171
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