Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 BRYOZOA. FIQ. 667. 437 Bryoza, CeUularia avicularia. a, natural size of a growing cluster; b and c, portions much magnified; d, bryo- zoan in its cell. species every cell has its ' birds' head' (Fig. 667), and this structure is exceedingly active, opening, shutting, and snapping almost continually. Many of the marine kinds produce coral; and patches of this substance are common on stones, shells, and sea-weeds. These delicate patches of coral are composed

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