The purpose of this application, under Article 75.6 of the Code, is to conserve the current usage of the name Helix atlantica Morelet & Drouët, 1857 (currently Oxychilus ( Drouetia) atlanticus) for a species of pulmonate gastropod by designating a neotype. The syntypes of this species housed in the Natural History Museum, London are not in taxonomic accord with the prevailing usage. Originally H. atlantica was said to occur in most islands of the archipelago of the Azores, but later this name was uniformly used for specimens from São Miguel Island only, while the syntypes are from Santa Maria Island. We request the Commission use its plenary power to set aside the existing name-bearing types and to designate a neotype from São Miguel Island, to conserve the prevailing usage and concept of the species.