Plate IX. 



4, 8, 9, 15, 16, iS, 21, 26, 30 — 39 Urcchinus naresianus. 2, 6, 11, 12, 25, 27 £/. giganteus. 3, 5, 17, 24 £/. Wyvillii. 19 K Loveni. 



1, 7, 10, 13, 14, 20, 22, 23, 28, 29 Cyslechinus clypeaius. 



Fig. i. Cyslechinus clypeatus (< Challenger » St. 133), globiferous pedicellaria. 7°/,. 



— 2. Urechinus gigantetis, valve of globiferous pedicellaria, side view. (Comp. Fig. 6). I2 5/ x . 



— 3. — Wyvillii, — - — — — — "S/ x . 



— 4. naresianus («Challenger» St. 302), valve of ophieephalous pedicellaria. I2 5/,. 



— 5. Wyvillii, valve of globiferous pedicellaria, from the inside. I2 5 x . 



— 6. giganteus, — - — — — - — (Comp. Fig. 2). I2 5/,. 



— 7. Cyslechinus clypeatus (« Challenger ■ St. 205), ophieephalous pedicellaria. 37/,. 



— 8. Urcchinus naresianus, spicule from tube-foot. I2 5/,. 



— 9. — valve of globiferous pedicellaria, from the inside. I2 ?/,. 



— 10. Cystechinus clypeatus ( Challenger ■■ St. 205), valve of ophieephalous pedicellaria. 5<y x . 



— 11. Urechinus giganteus, valve of ophieephalous pedicellaria. l2 5/ x . 



— 12. — — - triphyllous — I2 5/ x . 



— 13. Cyslechinus clypeatus (« Challenger* St. 334), valve of ophieephalous pedicellaria. I2 5/,. 



— 14. — — ( - 205), — - tridentate — 7°/ x . 



— 15. Urcchinus naresianus, valve of tridentate pedicellaria, coarse form. 7°/,. 



— 16. — - 7°/ x . 



— 17. — Wyvillii, — - — — 62 / x . 



— 18. — naresianus, — - ophieephalous — I2 5/i- 



— 19. — Loveni, — - tridentate — 5°/,. 



— 20. Cyslechinus clypeatus (Challenger- St. 334), valve of tridentate pedicellaria. 7°/,. 



— 21. Urechinus naresianus ( Challenger ■> St. 302), valve of coarse tridentate pedicellaria. 7°/,. 



— 22. Cyslechinus clypeatus («Challenger» St. 205), valve of ophieephalous (?) pedicellaria. 7°^. 



— 23. — — ( - 133), — - short tridentate — 7°/ x . 



— 24. Urechinus Wyvillii, valve of globiferous pedicellaria. I2 5/j. 



— 25. giganteus, — - large tridentate — 7°/ t . 



— 26. naresianus, — - triphyllous — I2 5/ x . 



— 27. giganteus, — - small tridentate — 7<y x . 



— 28. Cyslechinus clypeatus (< Challenger* St. 205), valve of small tridentate pedicellaria. 7°/ x . 



— 29. ( - 334), — - triphyllous «s/ x . 



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



— 31. — — miliary — 7°/,. 



— 32. — tridentate jjedicellaria, coarse form. 5°/,. 



— 33. — slender — 7°/,. 



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



35. globiferous pedicellaria. 



70/ 



/i- 



— 36. valve of tridentate pedicellaria, slender form. I2 5/,. 



— 37. — ophieephalous pedicellaria. 7°/,. 



— 38. tridentate pedicellaria, slender form. 7°/,. 



— 39. — spine from the peristome. 37/,. 



