Report on the Hydroids. 359 



may the rhizocaulus, when it reaches the edge of the support, grow 

 farther out freely into the water, but the creeping stem may send 

 out free, ramified hydrocauh; of this I have seen several examples 

 in Lafoëa serpens (Plate XX, fig. 8). 



All these phenomena are the outcome of the slight transition 

 existing between stolon, rhizocaulus and hydrocaulus. 



