List of Illustrations. 



FACIHO PAGE 



PLATE XXI. UMBELLULARIA LUMINOUS FISH SILICIOUS SPONGE- 

 LUMINOUS CORALS LUMINOUS CRUSTACEAN . . 125 



XXII. LUMINOUS FISH. With two luminous disks, one emit- 

 ting a golden, the other a greenish light 132 



XXIII. DEEP SEA ANGLER 145 



XXIV. PELICAN FISH , 155 



XXV. LUMINOUS WATERSPOUT 163 



XXVI. LUMINOSITY OF HERON'S BREAST 109 



