vi CONTENTS 



STUDIES ON PHY S ALIA PH Y SA LIS (L) (published 4th November i960) 



By A. K. Totton and G. O. Mackie 



Part 1. Natural History and Morphology 



By A. K. Totton 



Introduction page 303 



Acknowledgements 303 



Material and Methods 303 



Non-Technical Description of the Portuguese Man-of-War 306 



Appearance and Habits 307 



Morphology 326 



Origin of Physalia and the Siphonophora: the Paedophore Hypothesis . . . 358 



Distribution 363 



Summary 365 



References 366 



Plates VII-XXV following page 408 



Part 2. Behaviour and Histology 



By G. O. Mackie 



Introduction page 371 



Behaviour 372 



Histology 378 



Discussion 403 



Summary 403 



References 405 



Plates XXVI-XXVIII following page 408 



