Juliidae
... that the shell of marine snails in the family Juliidae is composed of two parts, like a clam?
... that the shell of marine <a href="./Snail" id="mwDgo" rel="mw:WikiLink" title="Snail">snails</a> in the family <b id="mwDgs"><a href="./Juliidae" id="mwDgw" rel="mw:WikiLink" title="Juliidae">Juliidae</a></b> is composed of two parts, like a <a href="./Clam" id="mwDg0" rel="mw:WikiLink" title="Clam">clam</a>?