Plate VII. 



Fig. i — 20. Hypsiechinus coronatas. 



— 1. Test of ?. Vi- 



— 2—4. Test of ?. V'j. 



— 5. Specimen with young. 3/ t . 



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



— 9. Apical area of $. 4/ z . 



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



— 11. Plate from the buccal membrane. Obj. II. Oc. I. 



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



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



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



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



Obj. II. Oc. I. 



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



— 17. Sphaeridia. Obj. II. Oc. III. 



— iS. 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 Prionechinus 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. - - Prionechinus 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. Oc. o. 



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



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



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



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



