XVI 



LIST OP ILLUSTRATIONS. 



PIG. PAGE 



60. Scolopendra 206 



61. Diagram of Insect . . . 209 



62. Organs of the Mouth in In- 



sects 211 



63. Podura 217 



64. Coccus Cacti 218 



65. Ectobius Germanica . . .218 



66. Tabanus dnctus .... 221 



67. Chcerocampa celerio . . .222 



68. Bombyx mori 223 



69. Uroceros gigas 224 



70. Dyiiscus marginalis . . .226 



71. Flustra hispida . . . .233 



72. Morphology of Polyzoa . . 235 



73. Plumatella repens . . .237 



74. Morphology of Tunicata . 240 



75. Terebratula vitrea , . 246 



PIG. PAGE 



76. Shells of Lamellibranchiata 254 



77. Odontophore of Valvata 



piscinalis 259 



78. Helix aspersa 261 



79. Shells of Gasteropoda . . 263 



80. Carinaria cymbium . . .264 



81. Morphology of Pteropoda .268 



82. Loligopsis 270 



83. Octopus carena .... 273 



84. Argonauta Argo . . . .276 



85. Diagram of Belemnite . . 277 



86. Diagram to show the posi- 



tion of the siphuncle and 

 the form of the septa in 

 various Tetrabranchiate 

 Cephalopods .... 280 



87. Ortkoceras explorator . .281 



