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Mucronalia, foot reduced, but still operculate, eyes present, animal fixed by its very long proboscis which is deeply buried in the tissues of an Echinoderm, no pseudopallium.

If it has been starved for several days in an aquarium it will attack an operculate form, but rarely with success.

Sometimes at the place where they exist, the outer membrane, in place of being thin and transparent, is separated in the form of a lid, thus becoming operculate, as in the passion-flower and gourd.

The small operculate genus Acme is a similar case.

We are not aware that operculate asci have yet been detected.