Abstract
Although the cnidocil apparatus has long been considered to be the receptor for nematocyst discharge in hydrozoans, the corresponding structure in scyphozoans and anthozoans has been little studied (see Mariscal, 1974c for recent review). Westfall (1966a, b) has called this a “cnidocil” in a scyphozoan and Pantin (1942) has used the term “ciliary cones” to describe small structures associated both with cnidocytes and sensory cells in sea anemones. Using scanning electron microscopy, Mariscal (1974a, b) has shown a correlation between nematocyst-bearing regions and ciliary cones on the tentacles of certain sea anemones and corals. More recently, Mariscal, Bigger and McLean (1976) have reported that spirocysts are not associated with ciliary structures on the tentacles of various zoantharians, but rather occur in close association with two different types of microvilli.
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