Plate 12. 



1-17. Acanthocidaris hastigera A. Ag. and Clark. 



1. Tip of stalk of globiferous pedicellaria, showing limb, x 156. 



2. Most abactinal primary spine. Nat. size. 



3. Abactinal primary spine. Nat. size. 



4. Side view of ambital primary spine. Nat. size. 



5. Ambital primary spine. Nat. size. 



6. Subambital primary spine. Nat. size. 



7. Actinal primary spine. Nat. size. 



8. More actinal primary spine. Nat. size. 



9. Still more actinal primary spine. Nat. size. 



10. Most actinal primary spine. Nat. size. 



11, 12. Interambulacral secondary spines, x 11. 

 13, 14. Ambulacral secondary spines, x 11. 



15. Actinal view of actinal secondary spine, x 11. 



16. Side view of same spine, x 11. • 



17. Miliary, x 11. 



18-30. Anomocidaris tenuispina A. Ag. and Clark. 



18. Valve of pedicellaria. x 156. 



19. Ambital primary spine. x 3. 



20. Actinal primary spine, x 3. 



21. Most actinal primary spine, x 3. 



22. 23. Interambulacral secondary spine. x 11. 

 24. Actinal secondary spine. x 11. 



25-27. Ambulacral secondary spines, x 11. 



28, 29. Actinal ambulacral secondary spines, x 11. 



30. Miliary. x 11. 



