Abstract
Open jaws of tridentate and ophiocephalous pedicellariae snap shut when their inner surfaces are touched. Removal of pedicellariae from the sea‐urchin does not abolish such responses, and because of their autonomy they have been conveniently investigated in a special photoelectric recording apparatus. Their jaw movements were analysed to determine effective stimuli; receptor distribution; form of the response, its latency, speed and duration. The results have been interpreted in relation to the structure and probable role of these types of pedicellariae.
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