> This is the same sponge that bores through stony corals? Yes?

Cliona bores in any calcium carbonate substrate.  A shell with live
Cliona will have lots of usually yellow dots-the sponge lives in the
holes that it makes within the shell, not in the space where the
mollusk is or was.

The name is unfortunately similar to a few mollusk genera (such as
Clio) in its stem, affecting the spelling of family names.  I don't
immediately recall who got to keep the Clionidae and who had to
change.

--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"

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