Plate 9. 



1-26. Aporocidaris Milleri A. Ag and Clark. 



1. Typical pedicellaria, with stalk, x 23. 



2. Valve of broader pedicellaria. x 23. 



3. Valve of narrower pedicellaria. x 23. 



4. Interior view of valve of pedicellaria. x 156. 



5. Tip of pedicellaria, showing well formed lip. x 156. 



6. Tip of pedicellaria, showing absence of lip ; same individual, x 156. 



7. Tip of pedicellaria, showing presence of end-tooth and liji. x 15G. 



8. Tip of pedicellaria, showing absence of end-tooth and lip ; same individual. x 156. 



9. Upper end of pedicellaria-stalk, showing absence of limb, x 55. 



10. Upper end of pedicellaria-stalk, sliowing indication of limb, x 5.5. 



11. Upper end of pedicellaria-stalk, showing rudimentary limb, x 55. 



12. I'rimary spine. Nat. size. 



13. Base of same spine, x 5. 



14. Tip of same spine, x 5. 



15. End view of same tip. x 5. 



16. Primary spine from another individual. Nat. size. 



17. Subambital primary spine. Nat. size. 



18. Actinal primary spine ; abactinal surface, x 11. 



19. Actinal primary spine; actinal surface. x 11. 



20. Very small actinal primary spine, x 11. 



21. Smallest actinal primary spine. x 11. 



22. Interambulacral secondary spine, x 23. 



23. Actinal secondary spine, x 23. 



24. 25. Ambulacral secondary spines. x 23. 

 26. Calcareous particles from pedicels. x 15(i. 



