. A manual of zoology. Zoology. 188 PROTOZOA. The fine granules of the protoplasm can enter the pseudopodia and produce here, as they move back and forth, the phenomenon of 'streaming.' Since foreign particles, like grains of carmine taken up by the protoplasm, can participate in this streaming, it. Fig. mi.—RntaUa frcyeri. (From Lang, after M. Schultze.) follows that the movements depend not \\\)o\i the granules but on the protoplasm itself. We have already used the fact (p. 62) that granules in the finest thread can move in opposite directions at the same time, to demonstrate the extraordina
. A manual of zoology. Zoology. 188 PROTOZOA. The fine granules of the protoplasm can enter the pseudopodia and produce here, as they move back and forth, the phenomenon of 'streaming.' Since foreign particles, like grains of carmine taken up by the protoplasm, can participate in this streaming, it. Fig. mi.—RntaUa frcyeri. (From Lang, after M. Schultze.) follows that the movements depend not \\\)o\i the granules but on the protoplasm itself. We have already used the fact (p. 62) that granules in the finest thread can move in opposite directions at the same time, to demonstrate the extraordinary complexity of protoplasmic structure. When Ehizopoda, in the free or en- cysted condition, increase by division, the division products frequently exchange the amoeboid motion for that of the Flagellata, and become fiagellate spores or zoospores. The body becomes ova] and develops, on the aiiterior end which contains the nucleus, one or more fiagella. which move more ener- getically than pseudopodia, and are perma- nent as long as the zoosjiore stage persists (fig. 121). Since many Protozoa possess fiagella along with pseudopodia, the Ijoundary between Rhizopods and Flagel- vft rF £ schuizo.) li^tes is not distinct (fig. 118). The Rhizopoda form an ascending series in which the systematic char- acters become more and more pronounced; such are the assumption of a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
