Aspects of the faunal composition and ecology of a recently dried-up lagoon in the Conception Bay area are discussed. The reasons for the demise of the lagoon are speculated on, and related to similar changes in coastal structures at several other localities on the South West African coast. Keywords: Bivalves, Dead mollusc shells, Deflation plains, Drainage channels, Gasteropods, Geographic conditions, Gravel, Lutraria lutraria, Marine organisms, Mytilid bivalves, Perna shells, Polychaete worm, Quartz, Salt pan, Sand, Shells, Silting up lagoon and Tapes corrugata.