1. Mangelia altenai (Brakman, 1938) is common in the shell banks in the Westerschelde, in the S. W. of the Netherlands. These banks consist largely of plio-pleistocene shells. BRAKMAN pointed out that NYST wrongly identified specimens of M. altenai from the Scaldisien of Antwerp with “Pleurotoma costata Da Costa”. I had an opportunity to compare specimens of M. altenai with several British specimens belonging to the S. V. WOOD collection in the Palaeontological Department of the British Museum (Natural History). It appeared that M. altenai goes under the name of Pleurotoma costata in that collection also, although not all the specimens thus labelled belong to it.