CONTENTS 



Introduction page 303 



Acknowledgements 3°3 



Material and Methods 3°3 



Non-technical Description of the Portuguese Man-of-War . . 306 



Appearance and Habits 3°7 



Association with Nomeus 3°9 



Rolling or somersaulting behaviour 309 



Floatation : Pneumatocyst or air-sac 310 



Motion relative to wind and water 315 



Stinging power and toxicology 322 



Nematocysts 3 2 4 



Morphology 326 



Historical 3 20 



Polymorphism 3 2 & 



Pattern of budding in the cormidia 328 



Early larvae 34 2 



Structure and development of the gonodendra 346 



Jelly-polyps 35 1 



Nectophores 35 2 



Palpons 353 



Ampullae 355 



Gonophores 35° 



Origin of 'Physalia' and the Siphonophora: the paedophore 



hypothesis 358 



Distribution 3^3 



Summary 3^5 



References 3 0D 



