. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. 266 COMPARATIVE ZOOLOGY. muscles, where they become encysted. In burrowing, they cause great pain and fever, and sometimes death. The adult Worm is about inch long. Class III.—Rotifera. The Wheel-animalcules, mostly found in fresh water, are minute Worms of few segments, having on the ante- rior end a disk ciliated on the edge, whence their name. They are from roir ^° "sV °^ an inch l°ng- They can bear drying and revivifying, like seeds. Class IY.—Pol
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. 266 COMPARATIVE ZOOLOGY. muscles, where they become encysted. In burrowing, they cause great pain and fever, and sometimes death. The adult Worm is about inch long. Class III.—Rotifera. The Wheel-animalcules, mostly found in fresh water, are minute Worms of few segments, having on the ante- rior end a disk ciliated on the edge, whence their name. They are from roir ^° "sV °^ an inch l°ng- They can bear drying and revivifying, like seeds. Class IY.—Polyzoa. These minute Worms resemble the Polyps in appearance, living in clusters, each individual inhabiting a delicate cell, or tube, and having a simple mouth surrounded with ciliated tentacles. The colony often takes a plant - like form; sometimes spreads, like fairy-chains or lace-work, over other bodies; or covers rocks and sea-weeds in patches with a delicate film. The majority secrete car- Fig. 219. — Rotifer, or bonate of lime. A Polyzoan shows its su- (Hydatina), highly periority to the Coral, which it imitates, magnified. jn possessing a distinct alimentary canal and a wrell-defined nervous system. The cells of a group never have connection with a common tube, as in Coelen- terates. There are both marine and fresh-water species. This group and the next following are related to the Mollusca. Class *V\—Brachiopoda. These Worms have a bivalve shell, the valves being applied to the dorsal and ventral sides of the body. The valves are unequal, the ventral being usually larger, and. 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
