Plate X. 



2, 15 — 17, 19, 21, 23, 25, 27, 31, 32, 34, 36 — 38 Plexechititis hirsutus. S, 9, 11, 14, 22, 26 PUemateckimis Rathbimi. i, 4, 7, 13, 24, 28, 



29 P. vesica. 5, 6, 30 Calytnne relicia. 29 Echinocrepis cuneata. 3, 12, 33 Cystocrepis sctigei-a. 10, 18, 20, 35 Spaiagocyslis 



Challengeri. 



Fig. I. Pilcmatechinus vesica, tridentate pedicellaria (comp. Fig. 4). 5o/j. 



— 2. Plexechimis hirsutus, valve of tridentate pedicellaria. '^s/j. 



— 3. Cystocrepis setigcra, — - ophicephaloiis — '^s/j. 



— 4. Pilematechinus vesica, — - tridentate — (comp. Fig. i). 5°/^. 



— 5. Calyimie relicta, valve of rostrate pedicellaria. ^°j^. 



— 6. - _ _ . _ _ 70/,. 



— 7. Pilcmatechinus vesica, globiferous pedicellaria. 5°/i. 



— 8. — RatJibuni, valve of tridentate pedicellaria. 7°/i. 



— g. — — — - globiferous — side view. '^s^'j. 



— 10. Spatagocystis Challengeri, valve of tridentate pedicellaria. so/j. 



— II. Pilematechinus Rathbuni, — - globiferous — from the inside. "5/i. 



— 12. Cystocrepis setigera, valve of rostrate pedicellaria. '^5/j. 



— 13. Pilematechinus vesica, — - tridentate — so/j. 



— 14. — Rathbuni, valve of triphyllous pedicellaria. '^5/i- 



— 15. Plexechi^ms liirsiitiis, valve of tridentate pedicellaria. '^s/j. 



— 16. — _ _ . _ _ 125/^. 



— 17. — — — - triphyllous — '75/j. 



— 18. Spatagocystis Challengeri, valve of rostrate pedicellaria. 7°/i. 



— 19. Plcxechiuus hirsutus, valve of ophicephalous pedicellaria. '^s/j. 



— 20. Spatagocystis Challengeri, valve of small tridentate pedicellaria. 7°/i. 



— 21. Plexechinus iiirsufus, primary spine, side view. (Comp. Fig. 31). 4°/,. 



— 22. Pilcinatcchinus Rathbuni, valve of tridentate pedicellaria. 37/j. 



— 23. Plexechinus hirsutus, valve of globiferous pedicellaria. '75/j. 



— 24. Pilematechinus vesica, — - short tridentate pedicellaria. so/j. 



— 25. Plexechinus liirsutus, sphæridia. '^s/i- 



— 26. Pilematechinus Rathbuni, valve of ophicephalous pedicellaria. "S/i- 



— 27. Plexccliiinis hirsutus, spicules, represented in their relative position in the tube-foot. '75/j. 



— 28. Pilematechinus vesica, valve of buccal tridentate jDedicellaria. 5°/^. 



— 29. - _ _ . _ _ _ 50/^. 



— 30. Calymne relicta, miliary spine. 5°/^. 



— 31. Plexechinus hirstctzis, primary spine, front view. (Comp. Fig. 21). t7i- 



— 32. — — miliary — "S/i- 



— 33. Cystocrepis setigera, ophicephalous pedicellaria. ^°|l. 



— 34. Plexechinus hirsutus, globiferous pedicellaria. "^ji. 



— 35. Spatagocystis Cliallengeri, rostrate pedicellaria. 5o/j. 



— 36. Plexechinus hirsutus, tridentate pedicellaria. so/j. 



— 37. — — filament of actinal tube-foot. '75/i- 



— 38. — — spine from the actinal plastron. 2°/i. 



— 39. Echinocrepis cuneata, tridentate pedicellaria. 5°/,. 



