The external morphology of Cricosphaera carterae is demonstrated using shadow, replicating and thin section techniques. The covering of the cell was found to be composed of three forms of scales which differ from one another in size and ornamentation. The largest of the three scales serves as the organic matrix on which the calcium carbonate is deposited to form the characteristic coccolith. The structure of these scales is discussed.

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Copyright © 1969 The Company of Biologists Ltd.
1969