von Proschwitz, T. Three Land-Snail Species New to the Norwegian Fauna: Pupilla Pratensis (Clessin, 1871), Vertigo Ultimathule Von Proschwitz, 2007 and Balea Sarsii Philippi, 1847 [= B. Heydeni Von Maltzan, 1881]. Fauna Norv. 2010, 30, 13-19.