PlatI': 2. 



1-4. Cidaris tribuloides Ag. 



1. Valve of globiferous pedicellaria. x lo(>. 



2. Upper end of stalk of globiferoiis pciliecllaria, showing absence of limb. x IHG. 



3. Valve of small globiferous pedicelhiria. x 15G. 



4. Interior view of base of valve of tridentate pedicellaria. x IHG. 



5-19. Doroeidaris panamensis A. Ag. 



/). Ti]) of valve of globiferous pedicellaria. x 15G. 



G. Valve of small globiferons i^edicellaria. x 156. 



• 7. Tip of valve of aiioth'er small globiferous pedicellaria, without end-tooth, x Gil 



8. Tip of valve of another small globiferous pedicellaria, with end-tooth, x G17. 



9. Ambital primary spine. N;it. size. 

 10. Base of same spine, x 5. 



r. 



11. Tip of same spine, x 



12. End view of same tip. x 5. 



1.'5. Small actinal primary spine, x 11. 



14. Abactinal intern mbulacral secondary spine. x 11. 



15. Actinal ambulacral secondary spine, x 23. 



16. Aotinostomal miliary, x 23. 



17. Same miliary from side, x 23. 



18. Most common form of miliary. x 23. 



19. Less common form of miliary, x 23. 



