Abstract
The fine structure of cilia in the gut of the rotifer, Philodina roseola, has been studied. The cilia display the usual structures for the first 9 µ of their length, but for the last 3 µ the shaft consists of plasma membrane clothing an unusual spiral sleeve. The sleeve is made up of 5 parallel fibres twisted in a left-handed helix about the long axis of the cilium.

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