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Arcella

ARCELLA (C.G. Ehrenberg), a genus of lobose Rhizopoda, characterized by a chitinous plano-convex shell, the circular aperture central on the flat ventral face, and more than one nucleus and contractile vacuole. It can develop vacuoles, or rather fine bubbles of carbonic acid gas in its cytoplasm, to float up to the surface of the water.

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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