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There is often a distinction, clear, but never sharp, between the richly vacuolate, almost frothy ectoplasm and the denser endoplasm.

The nucleus is always lodged in the endoplasm, and, in the septate forms, in the deutomeritic half of the body.

The process of sporulation begins by the segregation of small quantities of endoplasm around certain of the nuclei, to form little, rounded bodies, the pansporoblasts.

The general cytoplasm shows no differentiation into ectoplasm and endoplasm; it is uniformly alveolar in character.

Like the latter, there is one caudal bristle, but unlike it there is only one posterior contractile vacuole, while the endoplasm is filled with large granules or food balls.