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The structure of the smooth tentacles inLanice conchilegaPallas was studied employing an electron microscope. The monolayered tentacle epithelium is covered by a zonated cuticle which bears a granular border. Specialized cells of the epithelium comprise secretory cells and three types of sensory cell (one mechanoreceptor and two chemoreceptors). The kinocilia of the ciliated grooves possess two types of rootlets, one of which connects the basal bodies of neighbouring cilia. Below the epithelium are located layers of circular and longitudinal muscles. The wall of the tentacle cavity is composed of a coelothelium which bears only few cilia. The coelomic fluid contains coelomocytes (lymphocytes).

Electron microscope studies on the tentacles ofLanice conchilega (Polychaeta, Sedentaria)