PLATE X"-. 



Echinometra viridis,/ 1. 

 1. Seen from abactinal pole, nat. size. 



Echinometra subangularis,/. 2-4. 



2. Seen from abactinal pole, nat. size. 



3. Other specimen, nat. size, with more slender spines. 



4. Same from actinal side. 



