Plate X. 



2, 1517, 19, 21, 23, 25, 27, 31, 32, 34, 3638 Plexechinus hirsutus. 8, 9, n, 14, 22, 26 Pilematechinus Rathbuni. I, 4, 7, 13, 24, 28, 



29 P. vesica. 5, 6, 30 Calymne relicta. 39 Echinocrepis cuneata. 3, 12, 33 Cystocrepis setigera. 10, 18, 20, 35 Spatagocystis 



Challengeri. 



Fig. i. Pilematechinus vested, tridentate pedicellaria (comp. Fig. 4). so/,. 



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



3. Cystocrepis setigera, - ophicephalous - "S/,. 



4. Pilematechinus vesica, - tridentate (comp. Fig. i). so/,. 

 5. Calymne relicta, valve of rostrate pedicellaria. 7%. 



6. - - T%. 

 7. Pilematechinus vesica, globiferous pedicellaria. so/,. 



8. Rathbuni, valve of tridentate pedicellaria. ?%. 



9. - globiferous side view. I2 5/j. 



ID. Spatagocystis Challengeri, valve of tridentate pedicellaria. so/,. 



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



12. Cystocrepis setigera, valve of rostrate pedicellaria. I2 5/,. 



13. Pilematechinus vesica, - - tridentate r so/,. 



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



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



- 16. "S/i- 



17. - triphyllous '7S/,. 



18. Spatagocystis Challengeri, valve of rostrate pedicellaria. ?%. 



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



20. Spatagocystis Challengeri, valve of small tridentate pedicellaria. ?%. 



- 21. Plexechinus hirsutus, primary spine, side view. (Comp. Fig. 31). 4/,. 



22. Pilematechinus Rathbuni, valve of tridentate pedicellaria. s?/,. 



- 23. Plexechinus hirsutus, valve of globiferous pedicellaria. '7S/,. 



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



25. Plexechinus hirsutus, sphseridia. I2 5/j. 



26. Pilematechinus Rathbuni, valve of ophicephalous pedicellaria. I2 5/i- 



27. Plexechinus hirsutus, spicules, represented in. their relative position in the tube-foot, '7S/,. 



28. Pilematechinus vesica, valve of bticcal tridentate pedicellaria. so/,. 



- 29. 5 %- 



30. Calymne relicta, miliary spine, so/,. 



- 31. Plexechinus hirsutus, primary spine, front view. (Comp. Fig. 21). *%. 



33. miliary 125 /i- 



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



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



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



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



37. filament of actinal tube-foot. r 7S/,. 



38. spine from the actinal plastron. z0 /,. 



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



