zooecium

Same as zoœcium.

The ectocyst, or outer chitinous or calcified cell, in which a polypide of the Polyzoa is lodged, and into which a polypide can be retracted after protrusion; one of the cells of the cœnœcium, containing a polypide.

One of the cells or tubes which inclose the feeling zooids of Bryozoa. See Illust. of sea moss.

One of the cells or tubes which enclose the feeling zooids of Bryozoa.