Plate 2. 



1-4. Cidaris tribuloides Ag. 



1. Valve of globiferous pedicellaria. x loG. 



2. Upper end of stalk of globiferous pedicellaria, showing absence of limb, x 15G. 



3. Valve of small globiferous pedicellaria. x 156. 



4. Interior view of base of valve of tridentate pedicellaria. x 15G. 



5-19. Dorocidaris panamensis A. Ag. 



5. Tip of valve of globiferous pedicellaria. x 156. 

 G. Valve of small globiferous pedicellaria. x 156. 



7. Tip of valve of another small globiferous pedicellaria, without end-tooth, x 617. 



8. Tip of valve of another small globiferous pedicellaria, with end-tooth, x 617. 



9. Ambital primary spine. Nat. size. 



10. IJase of same spine, x 5. 



11. Tip of same spine, x 5. 



12. End view of same tip. x 5. 



l.'i Small actinal primary spine, x 11. 



14. Abactinal interambnlacral secondary spine. x 11. 



15. Actinal ambulacral secondary spine, x 23. 

 10. Actinostomal miliary, x 23. 



17. Same miliary from side, x 23. 



IS. Most common form of miliary. x 23. 



ID. Less common form of miliary, x 23. 



