Predation by a snail of the flowers of a narcissus Glénan “Narcissus triandrus” subsp. “Capax”. This predation is frequent in wet year. Narcissus Glénan is an endemic species of the archipelago Glénan, a Breton archipelago located about fifteen kilometers off the south coast of Finistère. It is a species totally subservient to the dune environment which, under the influence of seabirds, tends to eutrophy itself, and therefore develops nitro-halophilic vegetation (which likes nitrates and salt). In addition, the genetic diversity is low (less than 10 genotypes identified from 6 microsatellite markers on all populations).