The subgeneric classification of the European species of Pisidium as seen by ten authors, is summarized in a table. The number of subgenera appears to vary from 2 to 11, the number of species per subgenus from 12 to 1. All classifications are based on morphological features only. Genetical, biochemical and zoögeographical facts have rarely been taken into account uptill now. The author concludes it to be reasonable to adopt the praktice of most British malacologists to drop for the time beïng subgeneric names of Pisidium species. The invalidity of the subgeneric names Galileja Costa 1840; Rivulina Clessin, 1874; Cymatocyclas Dall, 1903 for palearctic species; Euglesa Leach in Jenyns, is commented.