xviii LIST OF ILLUSTRATIONS 



FIO. PAOB 



37. Actinophrys sol 55 



38. Actinosphaerium eichhornii 56 



39. Various forms of Heliozoa 57 



40. Lithocircus amiularis 58- 



41. Thalassoplancta brevispicula 59 



42. Aulactinium actinastrum 60 



43. Actinomma asteracanthion .60 



44. Collozoum inerme 61 



45. Didymium diiForme 62 



46. Euglena viridis 64 



47. Various forms of Flagellata 66 



48. Hsematococcus pluvialis 68 



49. Pandorina morum 69 



50. Volvox globator . . ^-. .70 



51. Heteromita rostrata j, . .71 



52. Various forms of Choanoflagellata 72 



53. Various forms of Dinoflagellata 74 



54. Noctiluca miliaris 74 



55. Monocystis agilis , . .75- 



56. Gregarina .77 



57. Eimeria and Coccidium 78 



58. Myxidium and Myxobolus 78 



59. Sarcocystis miescheri 79 



60. Paramoecium caudatum 80 



61. ,, ,, conjugation 81 



62. Various forms of Ciliata . . . ... 85 



63. ..... . 86 



64. Vorticella . ..... ... 87 



65. Zoothamnium arbuscula ... . ... 88 



66. Opalina ranarum 89 



67. Various forms of Tentaculifera 91 



68. Diagram showing the mutual relationships of the Protozoa . . 94 



69. Sycon gelatinosum 97 



70. ,, ,, magnified . 97 



71. ,, ,, transverse section . . . . . .98 



72. ,, ,, vertical section 99 



73. ,, ,, pore membrane . . ... 100 



74. ,, apopyle . 100 



75. External form of various Sponges 106 



7<>. Ascetta primordialis . . 107 



77. Diagrams of canal system of various Sponges 108 



78. Vertical Section of Spongilla . . . ... . . .109 



79. Cells of ectoderm of Sponge 110 



80. Skeleton of various Sponges ... .... Ill 



81. Various forms of Sponge Spicules 112 



82. Development of Sycon raphanus .114 



K3. Ol.clia . 120 



84. ,, vertical section of polype 122 



r>. Ni-m:itocysts of Hydra .... . . 123 



