. Animal biology. Zoology; Biology. \. -Dors^f/ fee/er Eye spot A/fa3c/es Flcume ce/l Cuf/cu/a Fxcrefory cfucf C/oaccf Cewe/r/' ^/a/^c/s •Toes Fig. 100. Fig. 99. Fig. 99.—Philodina roseola Ehrenberg. Not a typical rotifer, but one of the first types studied by microscopists; the ciliated discs on the head of the organism suggested the name rotifer. It both creeps and swims. A common American species. {From Jennings, in Ward and Whipple, ''Fresh-water Biology," after Weber, by courtesy of John Wiley & Sons, Inc.) X 300. Fig. 100.—Diagram of a rotifer in section to show internal structu
. Animal biology. Zoology; Biology. \. -Dors^f/ fee/er Eye spot A/fa3c/es Flcume ce/l Cuf/cu/a Fxcrefory cfucf C/oaccf Cewe/r/' ^/a/^c/s •Toes Fig. 100. Fig. 99. Fig. 99.—Philodina roseola Ehrenberg. Not a typical rotifer, but one of the first types studied by microscopists; the ciliated discs on the head of the organism suggested the name rotifer. It both creeps and swims. A common American species. {From Jennings, in Ward and Whipple, ''Fresh-water Biology," after Weber, by courtesy of John Wiley & Sons, Inc.) X 300. Fig. 100.—Diagram of a rotifer in section to show internal structure. The specimen is a female. {From Parker and Haswell, " Text-book of Zoology," by the courtesy of The Macmillan Company.) Rotifers are diecious and also polymorphic. The males are usually smaller than the females and frequently exhibit degeneration. This is a condition involving simphfication of structure and loss of organs. It is exhibited by parasites, as in the platyhelminths, but it also occurs apart from parasitism. The eggs are carried by the o^'iduct into the cloaca and thus reach the outside. Rotifers produce three types of eggs— female-producing summer eggs, smaller male-producing summer eggs, and female-producing winter eggs. Both types of summer eggs have. 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 Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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