Hatumia, a new genus for Oestophora riffensis Ortiz de Zarate, 1962, Oestophora cobosi Ortiz de Zarate, 1962 and Hatumia pseudogasulli n. sp (Pulmonata: Helicoidea: Trissexodontidae). Journal of Conchology, 39(2), November 2006: 119-134. 129 [Zoological Record Volume 143]