Plate IX. 



4, 8, 9, 15, 16, 18, 21, 26, 30—39 Urechinus naresianus. 2, 6, 11, 12, 25, 27 K giganteus. 3, 5, 17, 24 U. Wyvillii. 19 f/. Loveni. 



I, 7, 10, 13, 14, 20, 22, 23, 28, 29 Cysiechinus clypeatus. 



Fig. I. Cystechinus clypeatus (« Challengers St 133), globiferous pedicellaria. 7°/i. 



— 2. Urechinus giganteus, valve of globiferous pedicellaria, side view. (Comp. Fig. 6). '^sy^^ 

 _ 3. _ Wyvillii, _ - — — — — 125/j. 



— 4. — naresianus («Challenger» St. 302), valve of ophicephalous pedicellaria. "s/j. 



— 5. — Wyvillii, valve of globiferous pedicellaria, from the inside, ^^i■^. 



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



— 7. Cystechinus clypeatus {< Challenger ; St. 205), ophicephalous pedicellaria. 3? \. 



— 8. Urechinus naresianus, spicule from tube-foot '^s/i- 



— 9. — — valve of globiferous pedicellaria, from the inside. '^5/,. 



— 10. Cystechinus clypeatus (« Challenger > St 205), valve of ophicephalous pedicellaria. so/j. 



— II. Urechinus giganteus, valve of ophicephalous pedicellaria. '^s/i- 



— 12. — — — - triphyllous — '^s/j. 



— 13. Cystechinus clypeatus («Challenger» St 334), valve of ophicephalous pedicellaria. '^5/^. 



— 14. — — { — - 205), — - tridentate — 7o/j. 



— 15. Ureclmms naresianus, valve of tridentate pedicellaria, coarse form. 70/j. 



— 16. - - _ . _ _ 70/j. 



— 17. — Wyvillii, _ . _ _ 62/^^ 



— 18. — naresianus, — - ophicephalous — '^s/j. 



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



— 20. Cystechinus clypeatus (« Challenger* St 334), valve of tridentate pedicellaria. 70/j. 



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



— 22. Cystechinus clypeatus (: Challenger* St 205), valve of ophicephalous (?) pedicellaria. 7°/i. 



— 23. — — ( — - 133), — - short tridentate — 7o/j. 



— 24. Urechinus Wyvillii, valve of globiferous pedicellaria. '^5/,. 



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



— 26. — naresiamis, — - triphyllous — ^^^ji- 



— 27. — giganteus, — - small tridentate — 7°/,. 



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



— 29. — _ ( _ . 334), _ . triphyllous — "s/^. 



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



— 31. — — miliary — 70/j. 



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



— 33- — — — — slender — 7°/,. 



— 34- — — valve of tridentate pedicellaria, slender form. '^s/,. 



— 35. — — globiferous pedicellaria. 70/,. 



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



— 37. — — ophicephalous pedicellaria. 7°,',. 



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



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



