In the fluvio-paludal deposits of the Northern Sperrgebiet, freshwater and terrestrial molluscs are generally rare but in certain localities or horizons they are quite abundant. The commonest terrestrial snails are Trigonephrus and Dorcasia whilst urocyclid slug plates are rare, having been found at one locality only. Four freshwater snail genera have been identified, Tomichia, Lymnaea, Bulinus and Succinea, the latter being semi-terrestrial. The terrestrial assemblage has a distinct southwestern African cachet to it, but apart from Tomichia the freshwater snails belong to more widespread groups. The Lymnaea from the Sperrgebiet are by far the oldest known in Africa, only represented in other parts of the continent during the Middle and Late Miocene, Late Pleistocene and Holocene. The Bulinus from Langental are the earliest known in Africa.