Abstract
The fine structure of the hypodermal syncytium and extracellular cuticle of Asplanchna sieboldi show a number of interesting and somewhat unique features. Among these are numerous bulblike invaginations of the outer cell membranes, an unusual dense lamellar band adjacent to the apparently five-layered plasma membrane, and an acid polysaccharide-protein cuticle displaying complex morphology. A tentative working hypothesis is suggested concerning the involvement of various hypodermal organelles and components in cuticle production. Evidence on the nature of the cuticle comes from a number of histochemical tests as well as enzyme digestion and observation of the results with electron microscopy. Adult rotifers are apparently incapable of regenerating cuticle after its enzymatic removal.
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