. The Biological bulletin. Biology; Zoology; Marine biology. 192 D. R. STOKES AXD X. B. RUSHFORTH. Multiple CPs J I Figure 1. Claz'a polyp schematic showing representative kinds of evoked electrical pulses. A, delayed burst potentials similar to those shown in record B, but recorded at faster time base. Stimulus not indicated. B, a sequence of CPs and two bursts of DBPs evoked by four stimuli (dots beneath recording) applied to the burst generator region (hatched region). C, a typical CP evoked by stimulation of any part of the body column or tentacles. D, typical record of multiple CPs record
. The Biological bulletin. Biology; Zoology; Marine biology. 192 D. R. STOKES AXD X. B. RUSHFORTH. Multiple CPs J I Figure 1. Claz'a polyp schematic showing representative kinds of evoked electrical pulses. A, delayed burst potentials similar to those shown in record B, but recorded at faster time base. Stimulus not indicated. B, a sequence of CPs and two bursts of DBPs evoked by four stimuli (dots beneath recording) applied to the burst generator region (hatched region). C, a typical CP evoked by stimulation of any part of the body column or tentacles. D, typical record of multiple CPs recorded from the polyp stalk. E, multiple CPs similar to those recorded in D, but at a faster time base. Dot indicates stimulus artifact. G. gonophores, S, stolon; Vertical scale A applies also to B, C, D, E, = mV; Horizontal Scale A applies also to C, E, =, , sees, respectively; Horizontal Scale B applies also to D = sec. Positive identification of the underlying morphological source of electrical signals generated by these tissues is difficult and hence, for the moment, we cannot identify these events as neural, muscular, or epithelial. Instead the neutral term "conduct- ing system" (Josephson and Mackie, 1965) will be used to define the substrates of these electrical events. Two distinct kinds of electrical activity can be recorded from Clava depending on the stimulus site. Evidence presented here and in a subsequent report (Rush- forth and Stokes, in preparation) indicates that these two events represent activity in separate conducting systems. One of these conducting systems is activated only by direct stimulation of the hydranth distal to the gonophore stalks (Fig. 1. hatched region). The electrical events (Figs. 1A. P>) occur as a burst or a. 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 ori
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