XVI CONTENTS. 



PAGE 



B. TRIPEDALIA CYSTOPHORA 22 



a. Habitat 22 



b. External Anatomy 23 



c. Internal Anatomy 24 



PART III: DESCRIPTION OF SPECIAL PARTS OF THE ANATOMY 27 



A. VASCULAR LAMELLA 27 



B. NERVOUS SYSTEM 37 



LITERATURE 57 



TABLE OF REFERENCE LETTERS 58 



DESCRIPTION OF FIGURES .. 60 



