. A manual of zoology. PHYLUM PROTOZOA 33 In addition to reproduction by simple binary fission, spore-formation also occurs in some of the Radiolaria. The protoplasm contained in the central capsule breaks up into small masses, each of which becomes a flagellula provided with a flagellun (Fig. 44, E, F). In most of the Radiolaria there occur in the extra-capsular protoplasm minute yellow cells (Fig. 9, 2), which multiply. Fig. it. — CoilOZOum inerme. A—C. three forms of the entire colony, nat. siie; D, a small colony showing the numerous capsules (c. caps) and extra-capsular protoplasm with va
. A manual of zoology. PHYLUM PROTOZOA 33 In addition to reproduction by simple binary fission, spore-formation also occurs in some of the Radiolaria. The protoplasm contained in the central capsule breaks up into small masses, each of which becomes a flagellula provided with a flagellun (Fig. 44, E, F). In most of the Radiolaria there occur in the extra-capsular protoplasm minute yellow cells (Fig. 9, 2), which multiply. Fig. it. — CoilOZOum inerme. A—C. three forms of the entire colony, nat. siie; D, a small colony showing the numerous capsules (c. caps) and extra-capsular protoplasm with vacuoles {vac) ; E, spores containing crystals (c); mega- and microspore. iFrom Biitschli's Protozoa, after Hertwig and Brandt.) independently by binary fission. It has been proved that these are microscopic unicellular plants (Zooxanthelld) of the class Algae, which live in the substance of the protoplasm of the living Radiolarian. Such an intimate association between two living organisms is known as symbiosis. There can be no doubt that this association is beneficial both to the Radiolarian and to the Alga. It is characteristic of the plant cell that under the action of light and in the presence D. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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