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acetic acid acetone adsorbed amount of granular animals Bermuda boiled brittle-stars Buccoo Reef cent central canal chromophil cipitated coast completely precipitated containing cord of Raia crude luciferin Cypridina luciferin cytoplasm diameter digestion dissolve Dubois echinoderms eggs ejaculation ejaculatory apparatus electric organs enzyme evaginating extract fauna figure filtered filtrate Florida further precipitate gives granular material H. L. Clark holothurians Jamaica known large cells lead acetate light with luciferase luciferase luciferase solution luciferin luciferin and luciferase luminous Lütken methylene blue MgSO4 middle membrane minutes NaCl nerve-cells nucleus occur Octopus Ophioderma oral end outer tunic ovary oviducts ovisac oxidation oxyluciferin Pholas Pholas luciferin phosphotungstic acid photogenin photophelein picric acid pilocarpine plate Porto Rico present protein Raia ocellata region salts secretion soluble species specimens sperm mass sperm thread spermatophore spinal cord squid staining Thyone tion tissue Tobago Toluol Tortugas unit granules vacuoles West Indian West Indies