Ball SpongesIrcinia strobilina et al
A fairly common sponge seen in a variety of environments. Like so many other marine animal families, there are black "ball" shaped sponges that don't quite fit the exact description. Whereas the Black Ball sponge is round, or with round lobes, with depressions on top with a cluster of openings with-in the depression. The Ircinia genus has conical bumps on its surface and large exhalent pores which tend to occur in groups or run in rows along ridges on the top.