Berthella stellata
... that the internal shell of the sea slug Berthella stellata is visible through its translucent mantle?
... that the internal shell of the sea slug <i id="mwBKQ"><b id="mwBKU"><a href="./Berthella_stellata" id="mwBKY" rel="mw:WikiLink" title="Berthella stellata">Berthella stellata</a></b></i> is visible through its translucent <a href="./Mantle_(mollusc)" id="mwBKc" rel="mw:WikiLink" title="Mantle (mollusc)">mantle</a>?