Plate 12'', 



1-3. Dorocidaris affinis A. Ag. 

 All the figures are from a single individual, x 70. 



1. Tip of valve of a large pedicellaria of exactl}' the same appearance as the small 



pedicellaria of the same individual. ' 



2. Tip of valve of an ordinary large globiferous pedicellaria, but the opening is not quite 



terminal. 



3. Tip of valve of a somewhat larger pedicellaria with the opening distinctly terminal. 



4-6. Dorocidaris Blakei A. Ag. 

 All the figures are from a single individual, to show the diversity in the form 



of the opening, x 70. 



7-9. Centrocidaris Doederleini A. Ag. 



7. Valve of an ordinary large globiferous pedicellaria ; side view, x 70. 



8. Valve of peculiar large globiferous pedicellaria; inner view, x 70. 



9. Valve of tridentate pedicellaria ; side view, x 70. 



10-19. Actinal Primary Spines. x 5. 

 The even numbers show the abactinal side ; the odd numbers, the actinal side. 



10. 11. Stephanocidaris bispinosa A. Ag. 



12, 13. Stephanocidaris hawaiiensis A. Ag. and Clark. 



14, 15. Phyllacanthus annulifera A. Ag. 



10, 17. Phyllacanthus baculosa A. Ag. 



18, 19. Acanthocidaris hastigera A. Ag. and Clark. 



