Plate 26. 



1-4. Stephanocidaris hawaiiensis A. Ag and Clark. 



1. Abactinal view of cleaued test. 



2. Actiiial view of same. 



3. luterambulacral view of same. 



4. Arabulacral view of same. 



5-8. Phyllacanthus Thomasii A. Ag. and Clark. 



5. Abactinal view of cleaned test of medium-sized specimen. 

 0. Actinal view of same. 



7. Interambulacral view of same. 



8. Ambulacral view of same. 



All figures natural size. 



