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

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 on flat surfaces and is sometimes entirely recumbent.

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

It is mainly owing to the swollen and almost gelatinous nature of the ectocyst that the dendritic character of the zoarium is frequently concealed, for the method of branching is essentially the same as that of P. diffusa, although the zoœcia are not so distinctly elbowed.