LIST OF ILLUSTRATIONS 



FIG. i. 'THE BEAUTIFUL FLOSCULE' . . Frontispiece 



.. 2. EUPLECTELLA SPECIOSA 2O 



., 3. EUPLECTELLA SUBEREA 29 



4. A THIN SECTION OF THE SPIKE OF A SEA- 

 URCHIN 35 



., 5. TRANSVERSE SECTIONS OF SPIKES OF SEA- 

 URCHINS 37 



., 6. PARTS OF SEA-URCHIN 41 



7. THE ECHINUS, OR SEA-URCHIN ... 43 



., 8. SOME OF NATURE'S FIREWORKS ... 47 



,. 9. EUPLECTELLA CUCUMER 54 



., 10. REGADELLA PHCENIX 55 



ii. EUPLECTELLA ASPERGILLUM .... 57 



., 12. EUPLECTELLA Jovis 61 



,, 13. SPONGE SPICULES ..... 69 



14. GLOBIGERINA BULLOIDES 73 



.,15. A THIN SLICE OF CHALK ... 75 



1 6. POLYCYSTINA 8 1 



17. POLYCYSTINA ....... 85 



,, 18. RADIOLARIA 90 



., 19. RADIOLARIA (TUSCARORA) .... 91 



., 20. RADIOLARIA 93 



21. RADIOLARIA 94 



., 22. RADIOLARIA 95 



23. RADIOLARIA 97 



24. RADIOLARIA 98 



25. RADIOLARIA 99 



26. RADIOLARIA . 101 



27. RADIOLARIA 102 



