Section I Selected Aquatic Plant Organisms.- Dasycladaceae: A Family of Giant unicellular Algae Ideal for Research.- Acetabularia: A Giant Unicellular Organism for Studying Polarity.- Model Algal System to Study Plant Development.- Section II Selected Aquatic Animal Organisms.- Experimental Analysis of Developmental Processes in Marine Hydroids.- Reproduction and Development in Ctenophores.- Descriptive and Experimental Embryology of the Turbellaria:...