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Fig. 1f: perioral opening and peristome connected to cytopharynx

4 food vacuoles; 3 segments of macronucleus; cp, cytopharynx open to peristome (pi); cyto, cytostome or cell mouth; pek, perioral cilia covered by folds of the pellicle and cortex. EM taken on 4/5/71 by R. Allen with Hitachi HU11A TEM. Neg. 2,150X. Bar = 2µm.
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