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Zoarium, zō-ā′ri-um, n. the colony of the polypides of a polyzoan.

A tangled mass may thus be formed in which it is difficult to recognize the regular arrangement of the zoœcia that can be readily detached at the growing points of the zoarium.

The zoarium forms a flat, more or less solid layer and is closely adherent to foreign objects.

I have, however, seen only one instance of this premature development, in a single statoblast contained in a small zoarium of P. fruticosa found in Lower Burma in March.

The zoarium often covers a considerable area, but growth seems to be mainly in two directions.