Groh & Ibanez 1992. Rediscovery of Hemicycla saulcyi (d'Orbigny, 1839), a revision of its fossil allies (Gastropoda: Helicidae), and a description of a new species of Napaeus (Enidae), both from La Isleta, Gran Canaria, Canary Islands. Schriften zur Malakozoologie aus dem Haus der Natur-Cismar, 5 1992: 1-12