xviii LIST OF ILLUSTRATIONS 



FIO. PACK 



37. Actinophrys sol ... .55 



38. Actinosphserium eichhornii .56 



39. Various forms of Heliozoa ... . .57 



40. Lithocircus annularis ... .58 



41. Thalassoplancta brevispicula . . 59 



42. Aulactinium actinastrum . . 60 



43. Actinomma asteracanthioii . . .60 



44. Collozoum inerme . 61 



45. Didymium difforme . . .62 



46. Euglena viridis 64 



47. Various forms of Flagellata .... . .66 



48. Hamatococcus pluvialis ... 68 



49. Pandorina morum ... .69 



50. Volvox globator ... . 70 



51. Heteromita rostrata .... -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 ... . 7'-' 



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. Culls of ectoderm of Sponge . . 110 



80. Skeleton of various Sponges . . Ill 



81. Various forms of Sponge Spicules . . 112 



82. Development of Sycon raphanus . . 114 



83. Obelia . . . li'O 



84. ,, vertical section of polype ... . 122 



85. Nematocysts of Hydra .... . 123 



