a1 Hochschuldidaktisches Zentrum, Aachen, and Bioloˇski Institut, Dubrovnik
Earlier studies on the problems of the Adriatic Sea and the knowledge of its hydromedusae are restricted to the northern part. Will (1844) mentioned six species of hydromedusae found in the Bay of Trieste. Several studies ensued from the northern part of this sea, until Neppi (1912, 1915, 1922), Pell (1911, 1938), Kramp (1924), Babnik (1948) and Benović (1971 a) included other areas. Some specimens from the middle and southern Adriatic are mentioned in the planktonic works of Gamulin (1948, 1976), Hure (1955, 1961), Buljan, Hure & Pucher-Petković (1973) and Vučetić (1957, 1961, 1966).
p1 This paper is dedicated by the wish of his colleagues to the memory of Dr Schmidt who sadly died shortly before the text was submitted.