a Triton's trumpet (Charonia tritonis) shell used in ancient times as a horn to signal troop movements

a Japanese cockle, an egg cockle: an edible marine bivalve mollusc of family Cardiidae, species Fulvia mutica

cone snail, cone shell (Conidae)

a nautilus

kai-awase (a Heian period game involving matching two pieces of a clamshell) / (slang) tribadism

a lamp shell, lingulate brachiopod of the family Lingulidae

lampshell excluding the lingulate brachiopods (Articulata)

blood cockle, blood clam (an Asian species of bivalve resembling the cockle) (Tegillarca granosa)

shell money; cowry currency

juvenile shellfish