Plate X. 



2, 15—17, 19, 21, 23, 25, 27, 31, 32, 34, 36 — 38 Flexechinus hirsuius. S, 9, 11, 14, 22, 26 Pilematechinus Ralhbuni. i, 4, 7, 13, 24, 28, 

 29 P. vesica. 5, 6, 30 Calymne relicta. 39 Echinocrepis cuneaia. 3, 12, 33 Cystocyepis setigera. 10, 18, 20, 35 Spaiagocysiis 



Chaltengert. 



Fig. I. Pilematechinus vesica, trideutate pedicellaria (comp. Fig. 4). 50/j. 



— 2. Plexechinus hirsutus, valve of tridentate pedicellaria. '^5^^ 



— 3. Cystocrcpis setigera, — - ophicephaloiis — ^^^h- 



— 4. Pilematechinus vesica, — - trideutate — (comp. Fig. i). 50/j. 



— 5. Calymne relicta, valve of rcstrate pedicellaria. 7°/^. 



— 6. - - _ . _ _ 70/,. 



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



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



— 9. — — — - globiferous — side view. "Sy'j. 



— 10. Spatagocystis Challe72geri, valve of tridentate pedicellaria. so/j. 



— II. Pileviatechinus Rathbuni, — - globiferous — from the inside, '^syi. 



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



— 13. Pile?)iatcchinus vesica, — - tridentate — soy'^. 



— 14. — Rathbuni, valve of triphyllous pedicellaria. "s/i- 



— 15. Plexechiims hirsutus, valve of tridentate pedicellaria. '^5/j. 



— 16. — _ _ . _ _ 125/,. 



— 17. — — — - triphyllous — i75/j. 



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



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



— 20. Spatagocystis Challengeri, valve of small tridentate pedicellaria. ^°|i. 

 ^21. Plexechinus hirsutus, primary spine, side view. (Comp. Fig. 31). 40/j. 



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



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



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



— 25. Plexechinus hirsutus, sphaeridia. "^ji. 



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



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



— 28. Pilematechinus vesica, valve of buccal tridentate pedicellaria. 5°/i. 



— 29. _ _ — . _ _ _ 50/,. 



— 30. Calymne relicta, miliary spine. 5"/,. 



— 31. Plexechinus hirsutus, jirimary spine, front view. (Comp. Fig. 21). 4°/,. 



— 32. — — miliary — "5/,. 



— 33- Cystocrepis setigera, ophicephalous pedicellaria. 7°/,. 



— 34. Plexechimis hirsutus, globiferous pedicellaria. "5/,. 



— 35. Spatagocystis Challengeri, rostrate pedicellaria. so/,. 



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



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



— 38. — — spine from the actinal plastron, ^o/,. 

 . — 39. Echinocrepis cuneata, tridentate pedicellaria. so/,. 



