Middle Miocene tonnoidean gastropods from near Wonosari, Yogyakarta, Java, Indonesia

A well preserved tonnoidean gastropod fauna is described from Wonosari, Gunung Kidul Regency, Special Region of Yogyakarta, Java, Indonesia. In Bursidae, the second Indo-Pacific species of Aquitanobursa is described. In Cas­sidae, new species of Cassis and Cypraecassis are described, as well as the oldest known member of the genus Casmaria, and the first complete adult specimens of Phalium menk­rawitense Beets, 1941 are recorded. In Cymatiidae, spe­cies represented are Cymatiella fennemai (Martin, 1899), Monoplex rembangense (Wanner & Hahn, 1935), a most unusual new species of Monoplex, and Gyrineum bituber­culare (Lamarck, 1816). In Personidae, specimens assigned to Distorsio dunggranganensis (Martin, 1916) are the first adults of the species, and confirm distinction from the liv­ing species D. habei Lewis, 1972. In Tonnidae, two small (20 mm high) specimens of a Malea species with narrow spiral cords are assigned to M. papuana(Beets, 1943), the first record from Java.