. Animal biology. Zoology; Biology. COELENTERATES IN GENERAL 151 179. Behavior.—Coelenterates respond to various stimuli, their responses in general being similar to those of the hydra. The hydra, however, has only scattered sensory cells, while many of the other coelenterates develop specialized sensory structures. On the tentacles of a jellyfish are groups of tactile cells. Between the bases of the tentacles and along the margin of the bell are structures which are believed to function as organs of equilibrium and hence are called statocysts. Other groups of cells are recognized as being olf
. Animal biology. Zoology; Biology. COELENTERATES IN GENERAL 151 179. Behavior.—Coelenterates respond to various stimuli, their responses in general being similar to those of the hydra. The hydra, however, has only scattered sensory cells, while many of the other coelenterates develop specialized sensory structures. On the tentacles of a jellyfish are groups of tactile cells. Between the bases of the tentacles and along the margin of the bell are structures which are believed to function as organs of equilibrium and hence are called statocysts. Other groups of cells are recognized as being olfactory. Finally, there are pigment spots which are sensitive to light. 180. Reproduction.—In coelenterates generally the same types of reproduction occur as in the hydra. In the case of the hydra, however, Ephyra. / £gg cell - 4-ceU sf-age Blastula 2-eel I stage Gastrula Fertilization sperm cell from another animal Planula. 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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