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Millepore, mil′e-pōr, n. a species of branching coral, having a smooth surface with numerous minute, distinct pores or cells.—n.

They are the only known Corals that date so far back as the Upper Cambrian; and they continue under very similar forms all through the Palæozic, and are represented by the millepore corals of the present day.

The Millepore is very abundant on the Florida reefs.

The Pocillopora, an Acalephian coral, the Pacific representative of the Millepore of Florida, is especially abundant.

It has a flat surface, and, on all sides, except the north, is bounded by perpendicular cliffs about fifty feet high, composed entirely of dead coral, more or less porous, honey-combed at the surface, and hardening 789 into a compact calcareous mass, which possesses the fracture of secondary limestone, and has a species of millepore interspersed through it.