Abstract
A light-microscopical study of lamination in or associated with the shell wall of G. oviformis suggests greater structural complexity and variability than was previously suspected and should provide a baseline and framework for more comprehensive studies with the electron microscope. The nature and diversity of various laminar features, including laminar aggregates intercalated between the cytoplasmic body and the shell proper, are considered in detail, and an attempt was made to relate the structures to those encountered in other protozoans by the electron microscopist.

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