Euthecosomatous gastropods (Mollusca : Heterobranchia) from Buton (SE Sulawesi, Indonesia), with notes on species from Viti levu, Fiji; systematics, biostratigraphy

Pteropoda (Mollusca, Gastropoda, Euthecosomata) described by Beets (1943, 1 950, 1953) from the alleged Late Miocene/Early Pliocene asphaltic deposits of Buton (SE Sulawesi, Indonesia) are revised. The following species are di stinguished: Styliola subula (Quoy & Gaimard, 1827), Cavolinia bituminata ( Beets, 1953), Cavolinia mexicana (Collins, 1934), Cavolinia vendryesiana (G uppy, 1873) and Diacria mbaensis Ladd, 1934. A comparison with the Fiji pte ropod associations suggests a Miocene (Tortonian to Messinian) age for the Indonesian faunules. Pteropod species described by Ladd (1934) from Viti Le vu (Fiji Islands), are revised in an appendix. Five species are distinguish ed, viz. Creseis acicula (Rang, 1828) (?), Cavolinia gypsorum (Bellardi, 18 73), C. mexicana, C. rewaensis (Ladd, 1934) and Diacria mbaensis Ladd, 1934 . The presence of Cavolina gypsorum dates this association as Miocene (Tort onian-Messinian).