The structure of the tentacle in two species of Pogonophora (of the generaNereilinumandOligobrachia)has been investigated by light- and electron-microscopy. The fine structure of the pinnules, epidermal cells and mucous cells is described. The surface membrane of the epidermal cells and the pinnules forms an elaborate system of microvilli which traverse the cuticle and often extend up to the surface particles.
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Gupta et al. (1966) studied this question.
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