STINGING-CELLS IN CEASPEDOTE MEDUSA. 



"69 



Text-fig. 1. 



tent. t. 



[ 



I 



A longitudinal section tlirongli the ocellar bulb and the base of a 

 tentacle of Mcerisia lyonsi. tetit.b. Ocellar bulb. nem. 

 Nematocyst migrating into the tentacle. 



Text-fig. 2. 



neirv 



tent h 



Section of the umbrella edge of Mcerisia lyonsi showing the 

 velum {vel ) and jjart of an ocellar bulb (tent.b.) nem. 

 Nematocyst migrating towards the edge of the velum. 



