Plate X. 



2, 15 — 17, 19, 21, 23, 25, 27, 31, 32, 34, 36 — 38 Plexechinus hirsutus. 8, 9, 11, 14, 22, 26 Pilematcchinus Rathbttni. 1, 4, 7, 13, 24, 28, 



29 P. vesica. 5, 6, 30 Calymne relicta. 39 Echinocrepis cttneata. 3, 12, 33 Cys/ocrepis setigera. 10, 18, 20, 35 Spatagocystis 



Challe7igeri. 



Fig. I. Pilematechinus vesica, tridentate pedicellaria (comp. Fig. 4). 5°/,, 



— 2. Plexechinus hirsutus, valve of tridentate pedicellaria. I2 5/j. 



— 3. Cystocrcpis setigera, — - ophicephalous — I25 A- 



— 4. Pilematechimis vesica, — - tridentate (comp. Fig. 1). 5°/,. 



— 5. Calymne relicta, valve of rostrate pedicellaria. 7 / r . 

 _ 6. - - - - 7%. 



— 7. Pilematechinus vesica, globiferous pedicellaria. &j x . 



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



— 9. — — - globiferous side view. "S/j. 



— 10. Spatagocystis Challenger/', valve of tridentate pedicellaria. 5<y'j. 



- 11. Pilematechinus Rathbuni, — - globiferous from the inside. "5/ 1 . 



— 12. Cystocrcpis setigera, valve of rostrate pedicellaria. I2 5/j. 



— 13. Pilematechinus vesica, — - tridentate — 5°/j. 



— 14. — Rathbuni, valve of triphyllous pedicellaria. I2 5/ x . 



— 15. Plexechinus hirsutus, valve of tridentate pedicellaria. I2 5/j. 



— 16. — — - - - - M5/ x . 



— 17. — — - triphyllous — '75/j. 



— 18. Spatagocystis Challcngeri, valve of rostrate pedicellaria. 7 / z . 



— 19. Plexechinus hirsutus, valve of ophicephalous pedicellaria. I2 5/ t . 



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



— 21. Plexechinus hirsutus, primary spine, side view. (Comp. Fig. 31). 4%. 



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



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



— 24. Pilematechinus vesica, — - short tridentate pedicellaria. 5°/j. 



— 25. Plexechinus hirsutus, sphteridia. "S/j. 



— 26. Pilematechinus Rathbuni, valve of ophicephalous pedicellaria. I2 5/ IP 



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



— 28. Pilematechinus vesica, valve of buccal tridentate pedicellaria. 50^. 



— 29. - — 5%. 



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



— 31. Plexechinus hirsutus, primary spine, front view. (Comp. Fig. 21). *°/ s . 



— 32. — — miliary — I25 /i- 



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



— 34. Plexechinus hirsutus, globiferous pedicellaria. I2 5/j. 



— 35. Spatagocystis Challcngeri, rostrate pedicellaria. 5°/j. 



— 36. Plcxechimis hirsutus, tridentate pedicellaria. 5 / t . 



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



— 38. — — spine from the actinal plastron. 20 /j. 



— 39. Echinocrepis cuneata, tridentate pedicellaria. 5%. 



