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Peristome showing the corrugated wall, equivalent to the ribbed wall
of Paramecium, that contains tubular projections of alveoli and
cross sections of two ribbons, one of 2 microtubules and one of 4
microtubules, that arise in this zone. The ends of these ribbons, at
their origins, are covered by a myoneme which, in turn, is accompanied
by a layer of ER. The microtubules will extend along the wall of the
peristome and some will pass beyond the cytostome to form the lamellae
of the cytopharynx. Vesicles bind to the lamellae (see Fig. 22) and
provide membrane for the nascent food vacuole. opk, oral
polykinetids; my, myoneme; er, endoplasmic reticulum;
cv, contractile vacuole; mt, microtubular ribbons.
pp, pellicular pore; Gc, Golgi complex. EM taken on
6/10/69 by R. Allen with Philips 300 TEM. Neg. 14,800X. Bar = 0.5µm.
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