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A dividing Didinium nasutum (obtained from Carolina Biological
Supply Company, NC, U.S.A.). This large ciliate is capable of
engulfing Paramecium. It has a thick ectoplasm (ep)
containing numerous mucocysts embedded in its extensive epiplasm. Its
external surface is coated with a layer of bacteria (bact) in
this dividing cell. The cytoplasm is relatively compact under the
conditions of fixation used. Electron opaque vacuoles are scattered in
the cytoplasm. mac, macronucleus. (For a more detailed report
see Wessenberg and Antipa, Protistologica 4:427-447, 1968). EM taken
on 5/9/69 by M. Sage with Philips 300 TEM. Neg. 3,120X. Bar = 2µm.
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