The structure of the organelles situated beneath the kinetosomes in the adoral zone of membranelles of the rumen ciliate Entodinium caudatum have been investigated in the electron microscope using the technique of negative staining. Each kinetosome was joined to a sub-kinetosomal plate and these plates were joined together in rows which in turn were more loosely linked to form a sheet. The structure or these plates is described and their relationship to similar structures in other protozoa is discussed. The nature of the argentophilic structures observed in the light microscope at the anterior end of Entodinium caudatum has also been investigated in the electron microscope.
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