Evolution of the First Nervous Systems

I. Intercellular Communication.- 1 Cnidarian Gap Junctions: Structure, Function and Evolution.- 2 Intercellular Junctions in Ctenophore Integument.- 3 Chemical and Electrical Synaptic Transmission in the Cnidaria.- 4 Control of Morphogenesis by Nervous System-derived Factors.- 5 Differentiation of a Nerve Cell-Battery Cell Complex in Hydra.- 6 Chemical Signaling Systems in Lower Organisms: A Prelude to the Evolution of Chemical Communication in the Nervous System.- 7 Neurons and their Peptide Transmitters in Coelenterates.- 8 Peptidergic Neurotransmitters in the Anthozoa.- 9 Catecholamines, Related Compounds and the Nervous System in the Tentacles of some Anthozoans.- 10 The Antiquity of Monaminergic Neurotransmitters: Evidence from Cnidaria.- 11 Rethinking the Role of Cholinergic Neurotransmitters in the Cnidaria.- 12 Wide Range Transmitter Sensitivities of a Crustacean Chloride Channel.- 13 Two Pathways of Evolution of Neurotransmitters-Modulators.- 14 Summary of Session and Discussion on Intercellular Communication.- II. Electrical Excitability.- 15 Ion Channels of Unicellular Microbes.- 16 Ion Currents of Paramecium: Effects of Mutations and Drugs.- 17 Membrane Excitability and Motile Responses in the Protozoa, with Particular Attention to the Heliozoan Actinocoryne contractilis.- 18 Ion Channels and the Cellular Behavior of Stylonychia.- 19 Ionic Currents of the Scyphozoa.- 20 The Electrophysiology of Swimming in the Jellyfish Aglantha digitale.- 21 Ionic Currents in Ctenophore Muscle Cells.- 22 Polyclad Neurobiology and the Evolution of Central Nervous Systems.- 23 Enigmas of Echinoderm Nervous Systems.- 24 Summary of Session and Discussion of Electrical Excitability.- III. Sensory Mechanisms.- 25 Chemoreception in Unicellular Eukaryotes.- 26 The Functional Significance of Evolutionary Modifications found in the Ciliate, Stentor.- 27 Hydromedusan Photophysiology: An Evolutionary Perspective.- 28 Summary of Session and Discussion on Sensory Mechanisms.- IV.