Archive image from page 364 of The depths of the ocean. The depths of the ocean : a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceangen00murr Year: 1912 PELAGIC PLANT LIFE 329 phorescent of the algae ; biologically they are of the 'bladder- type.' Other species are elongated (see Fig. 238), straight, or crescent-shaped. Within their cells they form big zoo- rf -rr T

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