The oral ribs with their microtubular ribbons and alveolar
(al) tubes pass through the cytostome to the cytopharynx and
nascent vacuole region. In this view the left wall of the buccal
cavity is in grazing section so the partial layer of microtubules
(mt) appears on both sides of the cytostome. The only membrane
not associated with alveoli (arrow) is that at the beginning of
the cytopharynx. sc, specialized cytoplasm. EM taken on 8/29/67
by R. Allen with Philips 200 TEM. Neg. 25,700X. Bar = 0.5µm.
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