|Abstract||Born described in two publications (1778, 1780) the molluscs in the collection of Empress Maria Theresa (1717-1780), now in the Natural History Museum at Vienna. In this paper the Pectinidae type material is described. Ten new species were introduced of which Argopecten|
nucleus (Born, 1778) and Minnivola pyxidata (Born, 1778) are valid taxa. The remaining eight names are junior or senior synonyms and there is also a nomen inquirendum.