LIST OF ILLUSTRATIONS xv 



FIG. PAGE 



60. NOCTILUCA .... 221 



61. POLYSTOMELLA .... 



62. PROTOMYXA ....... 223 



63. FLAGELLATE INFUSORIAN .... 225 



64. JELLYFISH OR MEDUSA ..... 229 



65. LIFE-HISTORY OF COMMON JELLYFISH . . 230 



66. PRECIOUS CORAL ...... 231 



67. LIFE-HISTORY OF LIVER-FLUKE . . . 234 



68. BUDDING MARINE WORM, SYLLIS . . . 240 



69. COMMON SEA-URCHIN ..... 244 



70. HOLOTHURIAN WITH YOUNG . . 247 



71. NAUPLIUS LARVA OF SACCULINA . 249 



72. FRESHWATER CRAYFISH . . 250 



73. PERIPATUS .... 252 



74. MALE AND FEMALE OF PNEUMORA 253 



75. DISARTICULATED BEETLE . 254 



76. EXTERNAL FEATURES OF CATERPILLAR . 255 



77. STRUCTURE OF SPIDERS . 257 



78. ROMAN SNAIL, Helix pomatia 259 



79. GREY SLUG, Limax maximus 260 



80. COMMON OCTOPUS . . 261 



81. DEEP-SEA CUTTLEFISH . . . 263 



82. DIAGRAM OF VERTEBRATE . 265 



83. BALANOGLOSSUS . . 267 



84. CEPHALODISCUS .... 268 



85. EXTERNAL APPEARANCE OF ASCIDIAN 269 



86. EXTERNAL FEATURES OF SKATE . 273 



87. EXTERNAL FEATURES OF COD . . . 275 



88. MALE AND FEMALE DRAGONET . . . 276 



89. EXTERNAL FEATURES OF FROG . . . 277 



90. LIFE-HISTORY OF THE FROG .... 279 



91. VARIETIES OF WALL-LIZARD .... 283 



92. EDIBLE BIRD'S-NEST . . . 287 



