CONTENTS. 



Page. 



Microciona prolifera 3 



Description of species 3 



Method of obtaining dissociated cells, fusion of cells, and formation of plasmodia 5 



Metamorphosis of plasmodia 9 



Lissodendoryx carolinensis 11 



Description of species 11 



Formation of plasmodia 12 



Stylotella heliophila 13 



Description of species 13 



Formation of plasmodia 13 



Result of intermingling dissociated cells of Microciona and Lissodendoryx 14 



Result of intermingling dissociated cells of Microciona and Stylotella 16 



Earlier experiments on Microciona chronologically arranged 17 



Addendum 25 



Descriptions of plates 29 



