. Animal biology. Biology; Zoology; Physiology. Fig. 25. — Life cycle of a Sporozoon, Monocystis. A. spore consisting of a spore case enclosing eight sporozoites; B, transverse section of same: C and D, liberated sporozoites; E, sporozoite after entering 'sperm-sphere' of Earth- worm; F and G, growth until fully developed trophozoite is formed surrounded by the degenerate remains of sperm-sphere with flagella of sperm; H, two trophozoites that have become free from degenerate sperm-sphere and united as gametocytes; I, encystment of gametocytes; J, division of nuclei and cyto- plasm to form gam
. Animal biology. Biology; Zoology; Physiology. Fig. 25. — Life cycle of a Sporozoon, Monocystis. A. spore consisting of a spore case enclosing eight sporozoites; B, transverse section of same: C and D, liberated sporozoites; E, sporozoite after entering 'sperm-sphere' of Earth- worm; F and G, growth until fully developed trophozoite is formed surrounded by the degenerate remains of sperm-sphere with flagella of sperm; H, two trophozoites that have become free from degenerate sperm-sphere and united as gametocytes; I, encystment of gametocytes; J, division of nuclei and cyto- plasm to form gametes; K, union of the gametes to form zygotes, residual cytoplasm of gametocytes in center of cyst; L, cyst containing many sporo- zoites formed by secretion of a spindle-shaped spore case around each zygote which then divides to form eight sporozoites. These become arranged as in A and are ready to be transferred to another host. (From Curtis and Guthrie.) expense of other organisms, their hosts, in which they create dis- turbances of more or less severity which frequently result in dis- ease. The successful attempt to get a living with little expenditure. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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