1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
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.
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- OCR text aligned to scanned pages
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- Vol. 2, pp. 342-342