. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. ¥. 326 DEPTHS OF THE OCEAN differs in various ways from Ceratittm, though systematically it is not far removed from it. The cells, however, lack the brown pigment-granules (at any rate, this is so in the case of marine species), and the contents are pale yellow or pink. It is im- probable that it can assimi
. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. ¥. 326 DEPTHS OF THE OCEAN differs in various ways from Ceratittm, though systematically it is not far removed from it. The cells, however, lack the brown pigment-granules (at any rate, this is so in the case of marine species), and the contents are pale yellow or pink. It is im- probable that it can assimilate carbonic acid, and it must there- fore somehow or other obtain organic matter for its nourish- ment. Unfortunately nothing is known regarding its mode of nourishment. These forms do not live so close to the surface as the species of Ceratiuvi, but all observations made hitherto indicate that they belong exclusively to parts of the sea to which light penetrates, where they exist along with the other algae. Their cells are much grosser than those of the species of Ceratmm, and the projections corresponding to the horns of Ceratiuin are short or entirely wanting. The membrane-curtains along the furrows are only slightly developed, and the cell itself is much more globular. The species of Peridiniu77i, and some other genera {Goiiymilax, Goniodoina), have thus at best only imperfect suspension-organs, but the mobility of the cells makes up for „ this deficiency. The way they are formed. Fig. 230. • y-rr [ u GoNYAULAx poLYGRAMMA. too, IS dinerent from what we notice m The cell-contents form a zoo- Ceratium. There is no proper cell - spore, shed out from the burst- ,. , , , 11 1 • ing cell-wall (^12). (Schiitt.) Qivision, but the Cell changes its contents to one, two, or four naked spores, which are shed out from their original covering (see Fig. 230). Each spore afterwards gradually evolves a new cell-wall for itself, within which it develops as the wall expands, and band
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
