12 LIST OF ILLUSTRATIONS 



PAGE 



FIG. 28. RADIOLARIA 103 



29. RADIOLARIA 104 



30. RADIOLARIA 105 



31. RADIOLARIA 106 



,, 32. RADIOLARIA 107 



33. A RADIOLARIAN 108 



,, 34. TRICERATIUM 113 



,, 35. HELIOPELTA 115 



36. COSCINODISCUS RADIATUS . . . . 117 



,, 37. EGGS OF A TINY MOTH 126 



38. FORAMINIFERA 13! 



39. LIMESTONES 133 



,, 40. DiFFLUGIA 141 



41. NEBELA 147 



,, 42. HYALOSPHENIA PAPILIO 149 



43. CLATHRULINA ELEGANS 151 



44. ARCELLA 153 



45. CYPHODERIA 156 



46. CORAL POLYPS 159 



47. CORALS WITH EXTENDED POLYPS . . .160 



,, 48. MADREPORES 162 



49. MADREPORA CYTHEREA 165 



50. BUILDING ROTIFER (MELICERTA RINGENS) . 177 



51. VOLVOX GLO BATOR 1 86 



52. SNOW CRYSTALS 193 



53. CRYSTALS FORMED BY BREATHING ON A 



WINDOW DURING FROST . . . .197 



54. A SMALL PORTION OF EYE OF WATER BEETLE 200 



55. A SMALL PORTION OF EYE OF HOUSE-FLY. 201 



,, 56. A PORTION OF A BLOW-FLY'S PROBOSCIS . 205 



57. FOUR FLINTS, SHOWING SILICIFIED SPONGES, 



KNOWN AS 'CHOANITES' . . . .214 



58. SILICIFIED SPONGES IN FLINT . . .217 



., 59. GUETTARDIA STELLATA 219 



