I 



* 



Plate 26. 



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



1. Abactinal view of cleaued test. 



2. Actinal view of same. 



3. Interambulacral view of same. 



4. Ambnlacral view of same. 



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



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

 (). Actinal view of same. 



7. Interambulacral view of same. 



8. Ambnlacral view of same. 



All figures natural size. 



