Cernuella (Cernuella) aginnica (Locard, 1882), an exotic landsnail, is reported from the Opdammermolen, near Polder de Berkmeer, Prov. Noord-Holland, the Netherlands. This snail was sofar known only from Walcheren, prov. Zeeland, the Netherlands, where it had been introduced intentionally in 1957, with the help of material originating from Wenduyne, Belgium.