The family Pyramidellidae Gray, 1840 (Mollusca, Gastropoda, Heterostropha) in West Africa. 4. The genera Megastomia, Odostomia, Ondina, Noemiamea and Syrnola. Iberus Suplemento, 5, noviembre 1999: 1-150. 68 [Zoological Record Volume 136]