. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. Fig. 4 (After Cleve.) Fig. 42. Trichodesmium (Blake). 124 THE PLANTS which encloses a living body containing a number ofdisc-like green structures (Fig. 40). Blue - Green Algae or Cyanophycese.—A smallnumber of the members of this group are pelagic,though most live in fresh water. They sometimesoccur in enormous numbers in tropical seas, forminglarge floating masses. They are usually threadlike,and arranged in groups or bundles. One form, Tricho-desmium erythraeum (Fig.
. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. Fig. 4 (After Cleve.) Fig. 42. Trichodesmium (Blake). 124 THE PLANTS which encloses a living body containing a number ofdisc-like green structures (Fig. 40). Blue - Green Algae or Cyanophycese.—A smallnumber of the members of this group are pelagic,though most live in fresh water. They sometimesoccur in enormous numbers in tropical seas, forminglarge floating masses. They are usually threadlike,and arranged in groups or bundles. One form, Tricho-desmium erythraeum (Fig. 42), is of a reddish colour,and probably accounts for the special name of theRed Sea, for periodically it occurs in enormousquantities in those waters. Coccolithophoridse.—These forms, on the borderline between animals and plants, are very minute,and are only met with occasionally in plankton caughtin the ordinary way, since their size allows themto pass easily through the meshes of the finestsilk net. There are two chief forms, known in oceanicwaters—Coccolithophora (Coccosphaera) and Rhabdo-sphaer
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectocean, bookyear1912
