TABLE OF CONTENTS.

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INTRODUCTION 1
PART I: SYSTEMATIC 3
Family I: CharybdeidÆ 3
Charybdea Xaymacana 4
II: ChirodropidÆ 4
III: TripedalidÆ 5
Tripedalia cystophora 5
PART II: GENERAL DESCRIPTION OF THE ANATOMY OF THE CUBOMEDUSÆ 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
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 LamellÆ 27
B. Nervous System 37
LITERATURE 57
TABLE OF REFERENCE LETTERS 58
DESCRIPTION OF FIGURES 60

                                                                                                                                                                                                                                                                                                           

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