Plate IX. 



4, 8, 9, 15, 16, 18, 21, 26, 3039 Urechinus naresianus. 2, 6, n, 12, 25, 27 /. giganteus. 3, 5, 17, 24 U. Wyvillii. 19 K Loveni. 



i, 7, 10, 13, 14, 20, 22, 23, 28, 29 Cystechinus clypeatus. 



Fig. i. Cystechinus clypeatus (Challenger St 133), globiferous pedicellaria. 7/,. 



2. Urechinus giganteus, valve of globiferous pedicellaria, side view. (Cotnp. Fig. 6). I2 s/i- 



3. Wyvillii, I25 /i- 



_ 4. naresianus (Challenger 81.302), valve of ophicephalous pedicellaria. I2 s/i- 

 5. Wyvillii, valve of globiferous pedicellaria, from the inside. "V 



6. giganteus, - (Comp. Fig. 2). Iz s/i- 



7. Cystechinus clypeatus (Challenger St 205), ophicephalous pedicellaria. 37/ x . 



8. Urechinus naresianus, spicule from tube-foot "S/j. 



9. valve of globiferous pedicellaria, from the inside. I2 5/ x . 



10. Cystechinus clypeatus ( Challenger* St 205), valve of ophicephalous pedicellaria. so/,. 



ii. Urechinus giganteus, valve of ophicephalous pedicellaria. l2 5/i- 

 _ 12. - triphyllous "S/i- 



13. Cystechinus clypeatus ( Challenger* St 334), valve of ophicephalous pedicellaria. I2 5/j. 



14. ( - 205), - tridentate ?%. 



15. Urechinus naresianus, valve of tridentate pedicellaria, coarse form. ?/,. 



- 16. 7 %- 



- 17. Wyvillii, 62 /i- 



18. naresianus, - -ophicephalous - I2 5/i- 

 _ 19. Loveni, - tridentate so/,. 



20. Cystechinus clypeatus ( Challenger* St. 334), valve of tridentate pedicellaria. 7%. 



21. Urechinus naresianus ( Challenger* St 302), valve of coarse tridentate- pedicellaria. 7/j. 



22. Cystechinus clypeatus ( Challenger* St. 205), valve of ophicephalous (?) pedicellaria. 7^. 

 23. ( - 133), - short tridentate 7/,. 



24. Urechinus Wyvillii, valve of globiferous pedicellaria. 12 5/ T . 



25. giganteus, - - large tridentate 7/,. 



26. naresianus, - triphyllous I2 5/i- 



27. giganteus, - small tridentate 7<y t . 



28. Cystechinus clypeatus (Challenger St. 205), valve of small tridentate pedicellaria. 7/,. 

 - 29. ( - 334). ' triphyllous I2 5/i- 



30. Urechinus naresianus, primary spine from the abactinal side. 37/,. 



31. miliary 7/,. 



32. tridentate pedicellaria, coarse form. 5<y,. 



33. slender ?%. 



34. valve of tridentate pedicellaria, slender form. I2 5/i- 



35. globiferous pedicellaria. 7<y x . 



_ 36. valve of tridentate pedicellaria, slender form. I2 5/i- 



37. ophicephalous pedicellaria. 7/,. 



38. tridentate pedicellaria, slender form. 7/ r . 



39. spine from the peristome. 37/j. 



