LIST OF ILLUSTRATIONS. x j 



FIO. PAGE 



79. Lingitla anatina, ....... 175 



80. Anatomy of a Bivalve Mollusk, . . . . .177 



81. Shells of Lamellibranchiata, ..... 178 



82. Ampullaria canaliculata, . . . . , .181 



83. Tongue of Whelk, 182 



84. Shells of Gasteropoda, 183 



85. Doris JoJimtoni, ....... 184 



86. Carinaria cymbium, . . . . . . .184 



87. Limax Sowerbyi, . . . . . . . 185 



88. Morphology of Pteropoda, . . . . . .180 



89. Sepiola Atlantica, . . . . . . .187 



90. Paper Nautilus, . . . . . . . .191 



91. Pearly Nautilus, . . . . . . .193 



92. Orthoceras, . . . . . . . .193 



93. Diagram of Invertebrata, and Vertebrata, .... 196 



94. Lumbar Vertebra of Whale, and Diagram of Thoracic Vertebra, . 198 



95. Skeleton of Beaver, ....... 199 



96. Fore-limb of Chimpanzee, . . . . . .200 



97. Hind-limb of Chimpanzee, ...... 200 



98. Digestive System of a Mammal, ..... 202 



99. Blood-corpuscles of Vertebrata, ..... 203 



100. Scales of Fishes, ........ 207 



101. Skeleton of Perch, ....... 208 



102. Outline of a Fish, 209 



103. Tails of Fishes, ' . ' 210 



104. Diagram of the Circulation of a Fish, . . . . .211 



105. Diagram of the Lancelot, . . . . . . 215 



106 Lamprey, . . . . . . .217 



107. Ganoid Fishes, : .' . . . . . 221 



108. Cephalaspis Lyellii, . . . . . . .222 



109. White Shark and Chimcera, ' 222 



110. Lepidosiren annectens, ....... 224 



111. Siphonops annulatus, ...... 227 



112. Axolotl, . . .228 



113. Great Water-newt, ....... 229 



114. Tree-frog, . . ' * 230 



115. Development of the Common Frog, .... 231 



116. Skull of a Python, . 235 



117. Diagram of the Circulation of a Reptile, .... 237 



118. Skeleton of a Tortoise, * . . . . . . 239 



119. Hawk's-bill Turtle, . 240 



120. Naja Haje, .241 



121. Eye and Head of Viper, . . . . . . 243 



122. Slow-worm, ........ 246 



123. Scincus officinalis, ....... 247 



124. Crocodilus vulgaris, . . . . . . . 248 



125. Ichthyosaurus, ....... 249 



