Plate 31. 



1-4. Phyllacanthus Thomasii A. Ag. and Clark. 



1. Abactinal view of cleaned test of small specimen. 



2. Actinal view of same. 



^i. Interambulacral view of same. 



4. Ambulacral view of same. 



5-8. Anomocidaris tenuispina A. Ag. and Clark. 



5. Abactinal view of partly cleaned specimen. 

 <). Actinal view of same. 



7. Interambulacral view of same. 



8. Ambulacral view of same. 



All figures natural size. 



