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Contractile vacuoles 1-3, a complex of variable arrangement; pellicle delicate; plastids discoid chlorophyll-bodies; reserves oil; eye-spot absent even in active state; holophytic or saprophytic, though with an anterior blind tubular depression simulating a pharynx.

It is easy to understand the relation of the saprophytic and the holophytic Flagellates to true plants.

In the active condition of such coloured holophytic forms there is usually at least one anterior “eye-spot,” of a refractive globule embedded behind in a collection of red pigment granules.