478 



ECHINODERMATA OPHIUROIDEA 



CHAP. 



the very young Ophiuroid the arms melt into a small central 

 disc, as in the Starfish, but the disc of the adult is made up of 



Fig. 207. Aboral view of Ophiothrix fragilis. x 1. r, Radial plate. 



a series of interradial dorsal outgrowths which meet one another 

 above the arms. 





