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Polyzoā′rium, a compound polyzoan; Polyzō′ary, the polypary or polypidom of a polyzoan.—adjs.

Of the early development of the polypary in the Dendroidea little is known, but the more mature stages have been fully worked out.

In the genus Phyllograptus the branches have become reduced 366 to four and these coalesce by their dorsal walls along the line of the nema, and the sicula becomes embedded in the base of the polypary.

In the Dendroidea, as a rule, the polypary is non-symmetrical in shape and tree-like or shrub-like in habit, with numerous branches irregularly disposed, and with a distinct stem-like or short basal portion ending below in root-like fibres or in a membranous disk or sheet of attachment.

From this first theca originates a second, opening in the same direction, and from the second a third, and soon, in a continuous linear series until the polypary is complete.