. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. roup, of which at present little is known, the skeletonis very varied in shape, and often of remarkable com-plexity and beauty (Figs. 82 to 86). The two closely allied forms, Ceratium (Fig. 38,p. 122) and Peridinium (Fig. 41, p. 123), enclosed in acuirass of plates, often occur in very large numbers;they are claimed by botanists as plants, but are alsoclassed by some zoologists as animals. Another form,often very common off our own coasts, is Noctiluca(Fig. 87), an important source of
. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. roup, of which at present little is known, the skeletonis very varied in shape, and often of remarkable com-plexity and beauty (Figs. 82 to 86). The two closely allied forms, Ceratium (Fig. 38,p. 122) and Peridinium (Fig. 41, p. 123), enclosed in acuirass of plates, often occur in very large numbers;they are claimed by botanists as plants, but are alsoclassed by some zoologists as animals. Another form,often very common off our own coasts, is Noctiluca(Fig. 87), an important source of the luminosity orso-called phosphorescence, which lights up the waterat night when disturbed. Of marine unicellular animals which have no skeletonlittle is known, for the reason that it is rarely possibleto study them alive on board, and practically impos-sible to preserve them properly for examination onshore ; consequently, careful drawings of such formsalive and expanded are greatly needed; to thosepossessed of some zoological knowledge the nakedCiliata and Flagellata may be commended. GLOBIGERINA i65. Fig. 78.—Globigerina (from a Living Specimen) (Challenger). The central dark mass is the shell (compare Fig. 162, p. 222), from whichradiate stiff spines of lime. Round the shell is a bubbly mass of livingmatter, from which fine granular threads extend between the spines,generally straight, but some curved. i66 THE FLOATING ANIMALS
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectocean, bookyear1912
