LIST OF ILLUSTRATIONS. 



PYROSOMA AND DIVER (PLATE XVII.) Facing Title. 



SEA BOTTOM. 1,500 metres, or one-quarter of mile in depth . Facing Page 1 



FACISO PAGE 



PLATE I. LUMINOUS PROTOZOANS LUMINOUS PORTIONS OP Noc- 



TILUCA 3 



" II. M. DE TUSSAN READING BY LIGHT OF PHOSPHOR- 

 ESCENT SEA 7 



" III. LUMINOUS SEA JELLY LUMINOUS CORAL PRUNING- 



KNIPE FISH 11 



IV. LUMINOUS SEA JELLY AND MOLLUSK 13 



V. VENUS' GIRDLE 15 



" VI. APOLEMIA CLEODORA PRAYA. .... 43 



