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Cross section through the more anterior part of the oral region
showing the four more loosely spaced rows of cilia making up the
quadrulus and more compact cilia of the peniculi on the left hand wall
of the buccal cavity. The indentation of the endoral membranelle lies
to the right just above the buccal overture. The vestibulum bearing
somatic ciliature connects the buccal cavity with the outside of the
cell. The ribbed wall covers the upper right side of the buccal
cavity. mac, macronucleus. EM taken on 1/31/74 by R. Allen with
Hitachi HU11A TEM. Neg. 5,850X. Bar = 1µm.
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