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Paramecium

1911 Encyclopedia Britannica

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0. F. Muller, (often misspelt Paramaecium,. Paramoecium), a genus of aspirotrochous ciliate Infusoria, characterized by its slipper-like shape, common in infusions, especially when they contain a little animal matter. It has two dorsal contractile vacuoles, each receiving the mouths of five radiating canals from the inner layer of the ectosarc, and a large ovoid meganucleus, and one or two micronuclei. From its abundance, the ease with which it can be cultivated and observed, its relatively simple structure and adequately large size (-- in.), it is most frequently selected for elementary study and demonstration, as well as for purposes of research.