CONTENTS 



PAGF. 



Preface .: » ). vii 



Introduction 1 



Material and collections 4 



Methods G 



CHAPTER I 



General morphology 7 



Size and form 8 



Motor organelles 11 



Furrows and torsion of the body 13 



CHAPTER II 



Nuclei 18 



Pusules 22 



Ocelli 24 



Nematocysts 29 



CHAPTER III 



Cytoplasmic differentiation 3G 



Coloration 37 



Surface differentiation 41 



CHAPTER IV 



Phj'siology 43 



"Red Water" 44 



Nutrition 45 



Reactions to stimuli ; 50 



Luminescence 52 



CHAPTER V 



Comparative organology 55 



Ocelli 56 



Pusules I 57 



Nematocysts 59 



CHAPTER VI 



Life cycles 2 



Effects of parasitism on life cycle 66 



Binary and multiple fission 69 



Encystmcnt 72 



Sex. 75 



