Plate 123. 

 1. Clypeaster rosaceus (L.). 



1. Tridentate pcdicellaria. X 30. 



2-4. Clypeaster pallidus H. L. Clark. 



2. Side view of valve of tridentate pedicellaria. X 30. 



3. Blade of valve of tridentate pedicellaria. X 70. 



4. Blade of valve of ophieephalous pedicellaria. X 70. 



5-10. Clypeaster ravenelii (A. Ag.). 



5. Side view of small valve of ophieephalous pedicellaria. X 70. 

 G. Side view of large valve of ophieephalous pedicellaria. X 70. 



7. Interior view of valve of quadridentate pedicellaria. X 70. 



8. Interior view of loop of valve of ophieephalous pedicellaria. X 70. 



9. Interior view of loop of valve of ophieephalous pedicellaria. X 70. 



10. Quadridentate pedicellaria. X 70. 



11, 12. Clypeaster subdepressus (Gray). 



11. Quadridentate pedicellaria. X 30. 



12. Interior view of valve of quadridentate pedicellaria. X 30. 



13-16. Clypeaster europacificus H. L. Clark. 



13. Small valve of ophieephalous pedicellaria. X 70. 



14. Large valve of ophieephalous pedicellaria. X 70. 



15. Side view of valve of tridentate pedicellaria. X 70. 



16. Valve of tridentate pedicellaria. X 70. 



17-20. Clypeaster leptostracon A. Ag. & CI. 



17. Ophieephalous pedicellaria with valves open. X 70. 



18. Triphyllous pedicellaria. X 70. 



19. Valve of tridentate pedicellaria. X 70. 



20. Small tridentate pedicellaria. X 70. 



21, 22. Clypeaster lamprus H. L. Clark. 



21. Small tridentate pedicellaria. X 70. 



22. Valve of large tridentate pedicellaria. X 70. 



23. Clypeaster humilis (Leske). 



23. Interior view of loop of large valve of ophieephalous pedicellaria. X 70. 



24. Clypeaster audouini Fourtau. 



24. Valve of triphyllous pedicellaria. X 300. 



