northern chink shell
... that the northern chink shell has two types of teeth, changing slowly from one to the other as its diet varies?
... that the <b id="mwAeY"><a href="./Lacuna_vincta" id="mwAec" rel="mw:WikiLink" title="Lacuna vincta">northern chink shell</a></b> has two types of teeth, changing slowly from one to the other as its diet varies?