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The contractile vacuole of V. convallaria empties into a
convoluted chamber. This chamber is covered by the alveoli and plasma
membrane of the pellicle and is open to the cell’s surface via the
peristome (see Fig.1h) which is in turn connected to the perioral
opening (Fig. 1k) in the contracted cell. This preCV chamber
apparently harbors (cultures?) its own flora of bacteria. cv,
contractile vacuole; spo, spongiome; mt, ribbons of
microtubules that link the CV pore to the CV. EM taken on 3/29/71 by
R. Allen with Hitachi HU11A TEM. Neg. 11,250X. Bar = 0.5µm.
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