X LIST OF ILLUSTRATIONS 



FIGURE PAGE 



33. Honey Bee : Worker ; Queen ; Drone 34 



34. Queen Cell 35 



35. Honey Bee Egg ; Young Larva; Old Larva ; Pupa ... 35 



36. Honey Bees Clustering at Swarming Time 36 



37. Capturing a Swarm 37 



38. Model Apiary 38 



39. Cutting Combs from Box Hive 39 



40. Ichneumon Flies 40 



41. Adult Horn-Tailed Saw-Fly 40 



42. Common Housefly 41 



43. Eggs and Larvae of Culex 42 



44. Adult Culex ; Adult Anopheles 42 



45. Microphotograph of an Amoeba ....... 47 



46. Diagram of an Amoeba 48 



47. Amoeba Reproducing by Fission .49 



48. Diagram of Paramoecium 50 



49. Paramoecium 51 



50. Paramoecium Reproducing by Fission 51 



51. Vorticella 52 



52. One of the Foraminfera . 52 



53. Some Flagellate Protozoa 52 



54. Gonium . . . . . . . . ... .55 



55. Volvox 56 



56. Bath Sponge 58 



57. Diagram : Showing parts of sponge ...... 59 



58. Spicules of Lime 59 



59. Two Stages in the Development of the Sponge 60 



60. Microphotographs of Hydra 63 



61. Diagram of Body of Hydra . 64 



62. Microphotograph of Body Wall of Hydra 64 



63. Diagram of Cell Layers ........ 65 



64. Microphotograph of the Hydroid Obelia 66 



65. Diagram of the Hydroid Bougainvillea 66 



66. A Hydroid Colony that Looks Like a Plant 67 



67. A Hydroid Medusa 67 



68. The Medusa Known as Pelagia '67 



69. Pennaria Tiarella . 68 



70. Some Common Corals . 69 



71. Starfish 71 



72. Diagram of Body of Starfish 72 



73. Anatomy of the Starfish 72 



74. Purple Sea Urchin 74 



