The A. gives an account of the plankters found in the takes and ponds of a grotto of Sardinìa; she refers particularly aboutDiacyclops crassicaudis, which presents identity with a form found in a grotto of Tuscany («punta degli Stretti»). This form, which must be considered a variety of the tipical species, is to be included among the hypogean forms ofcrassicaudis.