Ball Sponge.

Description:

Photo take at -40 ft on a coral reef a common sponge in the Caribbean green color grow on top of the reef. Massive in shape, though less than 30 cm across. The surface is covered with small spiny structures, with slight cross-link ridges between pinnacles, but not with a well developed lattice-like network as in Ircinia felix. The exhalent pores are usually clustered in deprressions at the top of the sponge. Inhalent pores are much smaller and scattered all over the surface but particularly the lower parts of the sides.Color goes from gray to black.

Habitat:

inhabits marine waters, specifically those of the Caribbean Sea including off the coast of Florida, the Virgin Islands, Cuba and Venezuela.