LIST 01- ILLUSTRATIONS. 



PlGl! 



JFig. 93. Scales of Pish 257 



94. The Common Sole .. .... 258 



95. The Brazilian Mud-fish . . • -260 



96. The Electric Bay ... .262 



97. The Development of the Frog . . . .264 

 9.8. A Salamander ... . 265 

 99. Ichthyosaurus . . .... 268 



100. Two English Eeptiles : the Sand Lizard; the 

 Viper 271 



101. The Common Tortoise 272 



102. Breastrbone and Shoulder^girdle of Ostrich . 273 



103. Breast-bone of Ostrich and of Guillemot . . 275 



104. Nest of the Humming-Bird 278 



105. The Duck-billed Mole ... .280 



106. An Opossum carrying it.s young . 282 



107. Human Teeth in section ... . 284 



108. Succession of Teeth in an Ape . . . 285 



109. Teeth of Man 286 



110. Herbivorous dentition of Horse . . . 288 



111. Herbivorous dentition of the Great Kangaroo . 289 



112. Carnivorous dentition of Lion .... 290 



113. Carnivorous dentition of Wolf and Dog . 291 



114. Carnivorous dentition of Basyurus . 292 



115. Skull of Wild Boar 293 



116. The Musk Deer .294 



117. Skull of the Musk Deer . . . '294 



118. Insectivorous dentition of Mole . . . 295 



119. Dentition of Rodents: A, Porcupine; B, Skull 

 of Porcupine 296 



120. Dentition of Rodents : Stall and Teeth of Rat 297 



121. Rodent dentition of the Wombat . . . 298 



122. Vorticella .... . . 303 



123. Stentor 303 



124. Diagrammatic tree indicating the relationship 

 of different groups of the Animal Kingdom . 305 



