TABLE OF CONTENTS. 



PAGE 



INTRODUCTION 1 



PARTI: SYSTEMATIC 3 



Family I: CHARYBDEID^E 3 



Charybdea Xaymacana 4 



II: CHIRODROPID.E 4 



" III : TRIPEDALID^ 5 



Tripedalia cystophora 5 



PART II : GENERAL DESCRIPTION OF THE ANATOMY OF THE CUBO- 



MEDUS^E 7 



A. CHARYBDEA XAYMACANA 7 



a. Environment and Habit of Life 7 



b. External Anatomy 8 



2. Form of Bell 8 



3. Pedalia 8 



4. Sensory Clubs 9 



5. The Bell Cavity and its Structures 10 



(a) Proboscis 11 



(b) Suspensoria, or Mesogonia 11 



(c) Interradial funnels, or funnel cavities 11 



(d) Velarium 12 



(e) Frenula 12 



(f ) Musculature 12 



(g) Nerve ring 13 



c. Internal Anatomy 13 



6. Stomach 13 



7. Phacelli 14 



8. Peripheral Part of the Gastro-Vascular System 14 



(a) Stomach Pockets (Valves and Mesogonial Pockets) 14 



(b) Marginal Pockets 17 



(c) Canals of the Sensory Clubs and Tentacles 17 



9. Reproductive Organs 19 



10. Floating and Wandering Cells 20 



