. The elementary nervous system . FIG. 31.—Diagram of the jellyfish Aurelia from which the central mass and seven of the eight marginal bodies have been removed. The outline of the bell has been further compli- cated by a system of interdigitated cuts. (After Romanes, 1893.) length of the spiral. A much more complex preparation may be made by cutting out the center of a jellyfish bell, and then complicating it by a series of incomplete radial -incisions in alternation, one set starting from the inner edge of the bell and the other from the outer edge (Fig. 31). A bell thus complicated by so in
. The elementary nervous system . FIG. 31.—Diagram of the jellyfish Aurelia from which the central mass and seven of the eight marginal bodies have been removed. The outline of the bell has been further compli- cated by a system of interdigitated cuts. (After Romanes, 1893.) length of the spiral. A much more complex preparation may be made by cutting out the center of a jellyfish bell, and then complicating it by a series of incomplete radial -incisions in alternation, one set starting from the inner edge of the bell and the other from the outer edge (Fig. 31). A bell thus complicated by so intricate a series of interdigitations will nevertheless transmit a wave of con- traction completely around its tortuous length. In fact, secondary interdigitations may be cut on the lines of any
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