LIST OF ILLUSTRATIONS. 
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Fig, Page | Fig. Page 
1. Diagram of a Monodermic Or- 39. Transverse Section ofa Sycandra 104 
ganism .. 24 | 40. Amphiblastula Larva of a Cel - 
2. Diagram of a Didermic Or- careous Sponge . 106 
ganism .. 24 4x. Ascetta Primordialis .. . 107 
3 Diagram of a Tridermic Organ- 42. Transverse Section of an Ascon 107 
ism, seen in cross section 25 | 43. Transverse Section of Part of 
4. Ameeboid Cells 30 the Wall of a Leucon + 108 
5. Flagellate Cells 30 | 44. Transverse Section of a Rhagon 109 
6. Quiescent Cells 31 | 45. Hydra Viridis with Two Buds 411 
7. Types of Epithelium 32 | 46. Transverse Section of Hydra .. 112 
8. Connective Tissues 33 | 47. Portion of Body-wall of Hydra 113 
g. Muscular Tissue .. 34 | 48. An Ectoderm Cell, Endoderm 
to. Nervous Tissues .. 35 Cell, and a Nerve Cell  .. 114 
11. Diagram of a Cell 35 | 49. Development of the Nematocyst 
12. Diagram of Mitosis 36 in Cnidoblast Cells .. 115 
13. Diagram to illustrate Changes 50. Colony of Obelia Geniculata 117 
of the Nucleus during Cell- 51. Colony of Obelia Geniculata .. 118 
division .. 38 | se. A Medusa of Obelia 1Ig 
14. Diagram to illustrate “Typical 53. Lateral View of a Medusa of 
Conjugation .. 40 Obelia ++ 120 
15. Diagram illustrating Nuclear 54. Actinia Mesembryanthemum wie ERT 
Changes during pela Re- 55. Transverse Section through the 
production aa ‘ » 43 Upper Part of a Young 
16. Section of Blastula 50 Actinian el a8 +. 122 
17. Section of Morula 50 | 56. Transverse Section through 
18, Section of Gastrula 50 Lower Part of a eda 
1g. Section of Planula : 51 Actinian : ss 123 
20. The Origin of an Organ 53 | 57- Alcyonium Digitatum is 125 
21. The Metamorphosis of the Silk: 58. View of Entire Colony with 
worm Moth . 54 Tentacles Expanded 126 
22, Diagram to illustrate Darwin’s 59. Aurelia Aurita . 127 
Theory of Coral Reefs .. 72 | 60. Oral View of ‘Aurelia Aurita 128 
23. Protective Resemblance 77 | 61. Median Longitudinal Section 
24, The Leaf-butterfly of India 77 through the  Inter-radial 
25. Hypolimnas Missipus 78 Plane of Aurelia ‘ 129 
26. An Example of peseetive Re- 62. Three Stages in Development 
semblance 79 of Aurelia r P 130 
27. Amoeba Proteus .. 85 63. Transverse Section ‘through 
28, Amoeba Proteus 86 Upper Part of Scyphula 
29. Parameecium é go Larva © eo a A 30) 
30. Vorticella Nebulifera 93 | 64. Transverse Section through 
31. Life-History of Gregarina ~ 95 Lower Part of Seypa 
32. Types of Foraminiferan Shells 98 Larva... ‘ 3s 230 
33. A Heliozoan et ai 99 | 65. Cydippe Plumosa_ 131 
34. A Radiolarian roo | 66. Aborat View of Cydippe 132 
35. A Living Foraminiferan too | 67. Adhesive Cells uf Cydippe 132 
36. Acineta Tuberosa Expanded 68. Types of True Corals .. Mae E34 
and Contracted ror | 69. Ventral View of Liver-Fluke .. 137 
37- Sycandra Compressa_. 103 | 70. Transverse Section Hows the 
38. Calcareous Triradiate Spicules Liver-Fluke_.. . 138 
of Sycandra .. ro4 | 7x. Structure of Distomum . 139 
