xv i LIST OF ILLUSTRATIONS 



FIG. PAGE 



93. WING-FEATHER OF GOLDEN EAGLE . . 288 



94. MALE AND FEMALE HUMMING-BIRD . . . 290 



95. MOA AND KIWI ...... 291 



96. PECTORAL GIRDLE OF APE .... 292 



97. PHENACODUS, A PRIMITIVE UNGULATE . . 293 



98. HEAD OF GORILLA ..... 294 



99. HEAD OF SEMNOPITHECUS .... 295 



100. DIAGRAM OF A HYDROID COLONY . . . 305 



101. SPERMATOZOON OF CRAYFISH . . . 308 



102. MATURATION AND FERTILISATION . . . 309 



103. FORMATION OF GASTRULA .... 314 



104. EMBRYOS OF FOWL, DOG, AND MAN . . 317 



105. NAUPLIUS LARVA OF PEN^EUS . . . 318 



106. ZOJEA. LARVA OF PEN^US .... 319 



107. LATER LARVA OF PEN^EUS .... 320 



108. MYSIS-STAGE OF PEN^US .... 321 



109. LIFE-HISTORY OF BUTTERFLY . . . 325 



110. LIFE-HISTORY OF TAPEWORM .... 331 



111. LIFE-HISTORY OF CRAB ..... 335 



112. VARIETIES OF PIGEON ..... 341 



113. REDUCTION OF DIGITS IN PEDIGREE OF HORSE . 342 



114. ANTLERS OF STAG IN SUCCESSIVE YEARS . . 344 



115. SECTION THROUGH DOG'S HEAD . . . 356 



116. DEVONSHIRE PONY WITH STRIPES . . . 364 



117. DIAGRAM ILLUSTRATING MENDELISM . . 377 



118. MENDELIAN INHERITANCE IN ANDALUSIAN FOWLS 379 



119. AXOLOTL AND AMBLYSTOMA .... 389 



120. BRINE-SHRIMP, ARTEMIA .... 390 



121. TAIL-LOBES IN VARIETIES OF ARTEMIA . . 391 



122. SEASONAL DIMORPHISM OF Papilio ajax . . 394 



123. SEASONAL CHANGES IN PUFFIN'S BILL . . 395 



124. HALF-LOP RABBIT . 399 



