Archive image from page 362 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 327 resembling one another and all belonging to the same genus, namely, Dinophysis. The commonest of these, D. acuta (see Dinophyi Fig, 231), has a small tongue-shaped mobile cell without particu- larly well-defined suspension-organs. Its ring-furrow and protecting borders are situated at the forepart of
Archive image from page 362 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 327 resembling one another and all belonging to the same genus, namely, Dinophysis. The commonest of these, D. acuta (see Dinophyi Fig, 231), has a small tongue-shaped mobile cell without particu- larly well-defined suspension-organs. Its ring-furrow and protecting borders are situated at the forepart of the cell, and its sides are flattened to such an extent that the ventral furrow is on quite a sharp edge, where it is guarded by two membrane-cur- tains. The cell is formed by division, which takes place per- pendicularly to the ring-furrow. Within the cell are several brown chromatophores, showing that Dinophysis is one of the peri- dineae that assimilates carbonic acid. In warmer waters this funda- FiG. 2-1.—Dinophysis acuta. From the west coast of Norway (-?--)• (Jorgensen.) Fig. 232. a, Amphisolenia globosa ; b, Amphisolenia tenella, {\ mental type shows strange variations. Amphisolenia (see Fig. Amphisolenia. 232) has its whole cell drawn out to a hair, the ring-furrow is situated right in front on a little head, and the ventral furrow is on a narrow neck with slightly developed membrane-curtains like a kind of collar. The cell widens out slightly like a spindle in the middle, and posteriorly ends in a globular knob by way of balance, or in two or three ramifications. Triposolenia (see Triposoienia. Fig. 233) has a similar anterior structure, but the middle part is
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