 The North Atlantic topshell "Calliostoma occidentale" has been reported to feed on coelenterates.Contrary to what is the case in most other top shells, "Calliostoma" deposits its eggs in gelatinous ribbons that are only fertilized "after" being deposited.The young emerge as small snails (Lebour, 1936) without passing through a free-living planktonic stage as a veliger larva.