Plate VIL 



Fig. I — 20. Hypsiechinus coronatus. 



— I. Test of ?. 4/j. 



— 2—4. Test of $. V'i- 



— 5. Specimen with young. 3/^. 



— 6—8. Three developmental stages, the more important skeletal parts begun. Obj. II. Oc. 1. 



— 9. Apical area of 5- Vi- 



— 10. Piece of the rosette. Obj. II. Oc. III. 



— II. Plate from the biiccal membrane. Obj. II. Oc. I. 



— 12. Spicules from the gills. Obj. II. Oc. I. 



— 13. Spicules from tube feet. Obj. II. Oc. I. 



— 14. Aual plate of a young one. Obj. II. Oc. III. 



— 15. Calcareous piates from the buccal membrane, inside of the buccal piates. 



Obj. II. Oc. I. 



— 16. Valve of triphyllous pedicellaria. Obj. II. Oc. III. 



— 17. Sphæridia. Obj. II. Oc. III. 



— 18. Valve of ophicephalous pedicellaria. Obj. II. Oc. III. 



— 19. — - globiferous pedicellaria, from the inside. Obj. II. Oc. III. 



— 20. — - — — — - side. Obj. II. Oc. III. 



— 21. — - tridentate pedicellaria of Pnonechiims sagittiger. Obj. II. Oc. I. 



— 22. — - — — - Arbacina forbesiana. Obj. II. Oc. I. 



— 23. — - triphyllous — - Trigonocidaris albida. Obj. II. Oc. III. 



— 24. — - — — - Genocidaris maculata. Obj. II. Oc. III. 



— 25. — - — — - Pyionechinus sagittiger. Obj. II. Oc. III. 



— 26. — - — — - Arbacina forbesiana. Obj. II. Oc. III. 



— 27. Spicules from tube foot of Trigonocidaris monolini. Obj. V. Oc. o. 



— 28. — - _ _ - _ albida. Obj. V. O c. o. 



— 29. Valve of globiferous pedicellaria of Prionechinns sagittiger. Obj. II. Oc. III. 



— 30. — - — — - Genocidaris macnlata. Obj. II. Oc. III. 



— 31. — - — — - Trigonocidaris albida. Obj. II. Oc. III. 



— 32. — - — — - Arbacina forbesiana. Obj. II. Oc. III. 



