Jellyfish, Starfish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
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Jellyfish, Starfish, and Sea-Urchins: Being a Research on Primitive Nervous Systems

By G. J. Romanes
Free
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Table of Contents
  • JELLY-FISH, STAR-FISH AND SEA-URCHINS
  • PREFACE.
  • CONTENTS.
  • INTRODUCTION.
  • CHAPTER I. STRUCTURE OF THE MEDUSÆ.
  • CHAPTER II. FUNDAMENTAL EXPERIMENTS.
    • Effects of excising the entire Margins of Nectocalyces.
    • Effects of excising the entire Margins of Umbrellas.
    • Effects of excising Certain Portions of the Margins of Nectocalyces.
    • Effects of excising Certain Portions of the Margin of Umbrellas.
    • Effects upon the Manubrium of excising the Margin of a Nectocalyx or Umbrella.
    • Summary of Chapter.
  • CHAPTER III. EXPERIMENTS IN STIMULATION.
    • Mechanical, Chemical, and Thermal Stimulation.
    • Luminous Stimulation.
    • Electrical Stimulation.
    • Period of Latency, and Summation of Stimuli.
    • Effects of Temperature on Excitability.
  • CHAPTER IV. EXPERIMENTS IN SECTION OF COVERED-EYED MEDUSÆ.
    • Rate of Transmission of Stimuli.
    • Stimulus-waves.
    • Exhaustion.
    • Ganglia appearing to assert their Influence at a Distance from their own Seat.
    • Regeneration of Tissues.
  • CHAPTER V. EXPERIMENTS IN SECTION OF NAKED-EYED MEDUSÆ.
    • Distribution of Nerves in Sarsia.
    • Distribution of Nerves in Tiaropsis Indicans.
    • Staurophora Laciniata.
  • CHAPTER VI. CO-ORDINATION.
    • Covered-eyed Medusæ.
    • Naked-eyed Medusæ.
  • CHAPTER VII. NATURAL RHYTHM.
    • Effects of Segmentation on the Rhythm.
    • Effects of Other Forms of Mutilation on the Rhythm.
    • Effects of lessening the Amount of Tissue adhering to a Single Ganglion.
    • Effects of Temperature on the Rhythm.
    • Effects of Freezing Medusæ.
    • Effects of Certain Gases on the Rhythm.
  • CHAPTER VIII. ARTIFICIAL RHYTHM.
  • CHAPTER IX. POISONS.
    • Remarks.
    • Physiological Effects of Fresh Water on the Medusæ
    • The Fresh-water Medusa.
  • CHAPTER X. STAR-FISH AND SEA-URCHINS.
    • Structure of Star-fish and Sea-Urchins.
    • Modifications of the Star-fish Type.
    • Natural Movements.
    • Stimulation.
    • Section.
    • Special Senses.
  • FOOTNOTES:
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