Fine structure of the eyes of Pseudoceros canadensis (Turbellaria, Polycladida) Richard M. EakinJean L. Brandenburger OriginalPaper Pages: 1 - 16
The structure of the double-eyes of Baetis and the uniform eyes of Ecdyonurus (Ephemeroptera) Frank Burghause OriginalPaper Pages: 17 - 34
Bau und Funktion des Süßwasserschwamms Ephydatia fluviatilis L. (Porifera) Norbert Weissenfels OriginalPaper Pages: 35 - 45
Ergänzende Untersuchungen zur Ultrastruktur von Trichoplax adhaerens F.E. Schulze (Placozoa) Karl G. GrellGertrud Benwitz OriginalPaper Pages: 47 - 67
Fine structure and function of the digestive tract of Cyathura carinata (Krøyer) (Crustacea, Isopoda) Johann-Wolfgang WägeleUlrich WelschWaltraud Müller OriginalPaper Pages: 69 - 88
Observations on the moving colonies of the genus Tethya (Demospongia, Porifera) Lev Fishelson OriginalPaper Pages: 89 - 99