Plate 10. 



1-9. Centrocidaris Doederleini A. Ag. 



1. Small globiferous pedicellaria. x 55. 



2. Interior view of valve of same pedicellaria. x 120. 



3. Primary spine. Nat. size. 



4. Base of same spine, x 5. 



5. Tip of same spine, x 5. 



6. End view of same tip. x 5. 



7. Actinal primary spine, x 16. 



8. Interambulacral secondary spine, x 23. 



9. Ambulacral secondary spine, x 23. 



10-21. Aporoeidaris fragilis A, Ag. and Clark. 



10. Interior view of valve of pedicellaria. x 55. 



11. Side view of similar valve, x 55. 



12. Interior view of valve of pedicellaria, x 55. 



13. Side view of similar valve, x 55. 



14. Primary spine, x 5. 



15. Actinal primary spine, x 5. 



16. Side view of smallest actinal primary spine, x 11. 



17. Abactinal view of same spine, x 11. 



18. Secondary spine. x 11. 



19. Actinostomal miliary, x 11. 



20. Side view of actinostomal miliary, x 11. 



21. Abactinal miliary, x 11. 



22-25. Goniocidaris biserialis Dod. 



22. Interior view of valve of globiferous pedicellaria. x 55. 



23. Side view of similar valve, x 55. 



24. 25. Valves of small pedicellarisR. x 55. 



20. Goniocidaris mikado D<ki. 



26. Valve of small pedicellaria. x 55. 



27-31. Goniocidaris clypeata Dod. 



27. Valve of peculiar globiferous pedicellaria. x 55. 



28. Valve of i)eculiar globiferous pedicellaria. x 56. 



29. Valve of normal globiferous pedicellaria. x 35. 

 30,31. Valves of small pedicellariae. x 55. 



