among the tiny cuplike cavities usually with increased edges within the area of many corals Each is formed by a polyp b the cuplike frameworks inclosing the zooids of specific hydroids See Campanularian
- among the little cuplike cavities, usually with increased boundaries, within the area of all corals. Each is formed by a polyp. (b) One of the cuplike frameworks inclosing the zooids of specific hydroids. See Campanularian.
E, Section through a dividing calicle of Mussa, showing the union of two septa in the plane of division, and the origin of new septa at right angles to them.