. Animal biology. Zoology; Biology. OTHER UNSEGMENTED WORMS 191. support for the colony. Sometimes lime is added. Because of their superficial resemblance to corals such forms are known as coralline bryozoans. A mouth at the outer end is sur- rounded by a crown of cihated tentacles termed the lophophore, which exhibits the form of a horse- shoe when it is expanded. The U-shaped alimentary canal opens by an anus situated near the mouth and either within or without the lophophore. There are neither circulatory nor excretory organs. The nervous system consists of a central ganglion between the mo
. Animal biology. Zoology; Biology. OTHER UNSEGMENTED WORMS 191. support for the colony. Sometimes lime is added. Because of their superficial resemblance to corals such forms are known as coralline bryozoans. A mouth at the outer end is sur- rounded by a crown of cihated tentacles termed the lophophore, which exhibits the form of a horse- shoe when it is expanded. The U-shaped alimentary canal opens by an anus situated near the mouth and either within or without the lophophore. There are neither circulatory nor excretory organs. The nervous system consists of a central ganglion between the mouth and anus. Reproduction is both sexual and asexual, the latter taking place by bud- ding. These animals are either monecious or diecious. The eggs are fertilized in the coelom and is "somewhat similar. develop in a modified portion of the body cavity ^^^l^^^j^^l^^lHistir^" called an ooecium which serves as a brood pouch, by the courtesy of The The larva is in many respects like a trochophore. Macmiiian Company.) •^ ^ Natural size. Certain species produce nidividuals of a peculiar type called avicularia. These are highly modified forms possessing a pair of strong jaws, which probably are used in defense. Fig. 102.—a colony of marine bryozoans, Bugula turbinata Alder. A British species; an American species, Bugula turrita (Desor), Lophophore Av/cc//arr/u/rr, jaws c/osed Musc/e -^o boofy wa/J Ovary Sto/r7ach Furicu/us Ooec/u/7^ Pharynx Anas. 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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