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A partially filled contractile vacuole is connected to two regions of
spongiome tubules. The extra CV membrane is acquired from these
spongiomes (arrows). Presumably some of these spongiome tubules
are decorated with pegs which in Paramecium are known to be
V-type proton pumps. A spent vacuole lies nearby and has a filamentous
area in which membrane tubulation and vesiculation is taking place. A
similar filamentous array does not appear to be present in the
spongiome region of the CV or along the CV membrane itself. cv
p, CV pore; fv, food vacuole. EM taken on 4/21/78 by R.
Allen with Hitachi HU11A TEM. Neg. 9,200X. Bar = 0.5µm.
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