400歳の貝

http://www.asahi.com/science/update/1029/TKY200710290036.html

Full fathom five thy shell lies;
Nothing of it that doth fade
But doth suffer a sea-change
Into something rich and strange.
Sea-nymphs hourly ring its knell:
Ding-dong.
Hark! now I hear them - ding-dong, bell.