CONTENTS 



PART I 



THE BEHAVIOUR OF THE PLANT-ANIMALS 

 CHAP. PAGE 



I. Introductory : the worms, Convoluta roscoffensis 



and Convoluta paradoxa : their habits and habitats 3 



II. The origin and significance of the habits of Con- 

 voluta roscoffensis and Convoluta paradoxa . 37 



PART II 



THE NATURE OF THE PLANT-ANIMALS 



III. The green cells of Convoluta roscoftensis and the part 



they play in the economy of the plant-animal . 75 



IV, The origin and nature of the green cells of Convoluta 



roscoffensis ........ 100 



V. The significance of the relation between coloured 



cell- and animal-constituents of the plant-animals 130 



BIBLIOGRAPHY 159 



INDEX 161 



WITH TEXT-FIGURES, 1 22. 



COLOURED FRONTISPIECE. The Green Plant-Animal, Con- 

 voluta roscoffensis and the Brown Plant- Animal, 

 Convoluta paradoxa. 



