Plate 9. 



1. 

 2. 

 3. 

 4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 IG. 

 17. 

 18. 

 19. 

 20. 



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

 Typical pedicellaria, with stalk, x 23. 

 Valve of broader pedicellaria. x 23. 

 Valve of narrower pedicellaria. x 23. 

 Interior view of valve of pedicellaria. x 156. 

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

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

 Tip of pedicellaria, showing presence of end-tooth and lip. x 156. 

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

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

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

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

 Primary spine. Nat. size. 

 Base of same spine, x 5. 

 Tip of same spine, x 5. 

 End view of same tip. x 5. 



Primary spine from another individual. Xat. size. 

 Subambital primary spine. Nat. size. 

 Actinal primary spine ; abactinal surface, x 11. 

 Actinal primary spine; actinal surface. x 11. 

 Very small actinal primary spine, x 11. 



X 11. 

 X 23. 



X 156. 



21. Smallest actinal primary spine. 



22. Interambulacral secondary spine. 



23. Actinal secondary spine, x 23. 



24. 25. Aiubulacral secondary spines. 

 2G. Calcareous particles from pedicels 



X 2:5. 



X l.")(). 



