Collier's New Encyclopedia (1921)/Astræidæ

ASTRÆIDÆ, in zoology, a family of radiated animals belonging to the class polypi and the order helianthoida. It is especially to this family that the formation of coral reefs is to be attributed. It contains the genera astræa, meandrina, etc.

Source: Collier's New Encyclopedia 1. (1921) New York: P.F. Collier & Son Company. 314.