. The Cambridge natural history. Zoology. 6o CRUSTACEA COPEPODA Hettrochaeta papilligera ; Oncaea conifera is also phosphorescent. It is often stated that Sapjjhirina (p. 69) is phospliorescent, but its wonderful iridescent blue colour is purely due to interference colours, and has nothing to do with phosphorescence. Giesbrecht has observed that the pliosphorescence is due to a substance secreted in special skin-glands, which is jerked into the water, and on coming into contact with it emits a pliosphor- escent glow. This substance can be dried up completely in a desiccated specimen and yet pr
. The Cambridge natural history. Zoology. 6o CRUSTACEA COPEPODA Hettrochaeta papilligera ; Oncaea conifera is also phosphorescent. It is often stated that Sapjjhirina (p. 69) is phospliorescent, but its wonderful iridescent blue colour is purely due to interference colours, and has nothing to do with phosphorescence. Giesbrecht has observed that the pliosphorescence is due to a substance secreted in special skin-glands, which is jerked into the water, and on coming into contact with it emits a pliosphor- escent glow. This substance can be dried up completely in a desiccated specimen and yet preserve its phos- phorescent properties, the essential condition for the actual emission of light being contact with water. Similarly, specimens preserved in glycerine for a long period will phosphoresce when compressed in distilled water. From this last experiment Giesbrecht concludes that the phosphorescence can liardly be due to an oxidation process, l)ut the nature of the chemical reaction remains obscure. Fam. 2. Candacidae. — This family comprises the single genus Gandacc, with numerous species distributed in the plankton of all seas. Some species, C. iKctinata, Brady, have a practically world- wide distribution, this species being recorded from the Shetlands and from the Philippines, Fam. 3. Pontellidae.—This is a larger family also comprising widely distributed species found in the marine plankton. Anomalo- cera jxUtersoni (Fig. 27) is one of the commonest elements in the plankton of the North Fig. 27.—Dorsal view of Anomalo- cera pattersoni, S , x 20. (After Sars.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan Company
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