Abstract
In the heterotrich ciliate P. metchnicoffi the so-called cortex of the food vacuoles is composed of expansive material involving cytoplasmic "ribbons" of a sort and many microfibrillar bundles, all enclosed in a trilamellar plasma membrane. The rich bed of microfibrillar bundles penetrates into the surrounding cytoplasm. A comparison is made with the intestinal microvilli of multicellular organisms [Blepharisma, Metafolliculina andrewsi and Paramecium aurelia].

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