. The elementary nervous system . Fip. 42.—-Diagram of a jellyfish Aurelia whose bell has been deeply incised in a radial direction at eight places reducing it thus to partial octants each one of which carries a mar- ginal body. As shown by the experiment of Romanes, each octant has its own rate of pulsing. formed carries a single one of these bodies (Fig. 42), the segments thus formed continue to pulse but not in unison, for each will have its own rate. Loeb (1899) has shown that the apparent coordination of the group of marginal bodies or like organs in the medusae is due not to a coordinati
. The elementary nervous system . Fip. 42.—-Diagram of a jellyfish Aurelia whose bell has been deeply incised in a radial direction at eight places reducing it thus to partial octants each one of which carries a mar- ginal body. As shown by the experiment of Romanes, each octant has its own rate of pulsing. formed carries a single one of these bodies (Fig. 42), the segments thus formed continue to pulse but not in unison, for each will have its own rate. Loeb (1899) has shown that the apparent coordination of the group of marginal bodies or like organs in the medusae is due not to a coordinating center but to a condition such as is seen in the radially cut bell, except that in the normal bell the response from the marginal body that for the moment has the most rapid rate stimulates all the others to action and thus one body temporarily controls the whole bell.
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