1054 



MR. C. L. BOULENGER ON 



the number of its tentacles, one of the latter organs was branched 

 in such a way as to present the appearance of a smaller tentacle 

 growing out laterally from a perradial one. 



Text-fi^. 227. 



Diagrams showing the arrangement of tentacles in a normal and 



five abnormal medusse of Ilarisia lyonsi. 



P. Perradial tentacle. I. lutorradial tentacle. S. Secondary tentacle in an 



adradial position. The subradial tentacles are not lettered. 



