Japanese sea lilies
... that bivalve molluscs and brittle stars are often found in beds of Japanese sea lilies?
... that <a href="./Bivalvia" id="mwBCM" rel="mw:WikiLink" title="Bivalvia">bivalve molluscs</a> and <a href="./Brittle_star" id="mwBCQ" rel="mw:WikiLink" title="Brittle star">brittle stars</a> are often found in beds of <b id="mwBCU"><a href="./Metacrinus_rotundus" id="mwBCY" rel="mw:WikiLink" title="Metacrinus rotundus">Japanese sea lilies</a></b>?