PYROSOMA AND DIVER (PLATE XVII.) Facing Title. SEA BOTTOM. 1,500 metres, or one-quarter of mile in depth Facing Page 1 FACING PAGE PLATE I. LUMINOUS PROTOZOANS--LUMINOUS PORTIONS OF NOCTILUCA 3 „ II. M. DE TUSSAN READING BY LIGHT OF PHOSPHORESCENT SEA 7 „ III. LUMINOUS SEA JELLY--LUMINOUS CORAL--PRUNING-KNIFE FISH 11 „ IV. LUMINOUS SEA JELLY AND MOLLUSK 13 „ V. VENUS’ GIRDLE 15 „ VI. APOLEMIA--CLEODORA--PRAYA 43 „ VII. BURROW OF PHOLAS--SEA PEN 39 „ VIII. LUMINOUS STAR FISHES. From 4,500 feet deep 29 „ IX. LUMINOUS BEETLES, ETC. 47 „ X. ANATOMICAL DETAILS 53 „ XI. LUMINOUS BEETLE, in burrow of Mole Cricket 59 „ XII. THE LANTERN FLY 63 „ XIII. LUMINOUS MUSHROOMS--LUMINOUS INSECT 137 „ XIV. SPIDER CRAB 75 „ XV. LUMINOUS CRUSTACEANS 79 „ XVI. CHAIN OF SALPS 89 „ XVIII. CHIASMODUS--SUN-FISH--PLAGIODUS--HARPODON--BERYX 97 „ XIX. LUMINOUS FISH. From depth of 8,100 feet 103 „ XX. LUMINOUS FISH 115 „ XXI. UMBELLULARIA--LUMINOUS FISH--SILICIOUS SPONGE--LUMINOUS CORALS--LUMINOUS CRUSTACEAN 125 „ XXII. LUMINOUS FISH. With two luminous disks, one emitting 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 [Illustration: SEA BOTTOM. 1,500 metres, or one quarter of mile in depth.] LIVING LIGHTS. CHAPTER I. STARS OF THE SEA.