INDEX. 
403 
Dermis, 128. 
Development, 197. 
“ by alternate generation, 211. 
“ of Bird, 199. 
“ of blastula, 198, 165. 
“ of embryonic forms, 207. 
“ of gastrula, 193, 166. 
“ of Invertebrates, 204. 
“ by metamorphosis, 207. 
“ by metamorphosis, retro¬ 
grade, 210. 
“ oviparous, 309. 
ovoviviparous, 309. 
“ segmentation of egg, 197. 
“ of Vertebrates, 205. 
“ viviparous, 309. 
“ see Metamorphosis, Repro¬ 
duction. 
Diaphragm, 86, 88. 
Diastema, 70, 383. 
Dibranchiata, 280, 16, 47,151, 248, 249. 
Differentiation, 31. 
Digestion, chemical, 92. 
“ of Invertebrate, 92. 
“ of Man, 93. 
“ object of, 91. 
“ of Vertebrate, 92. 
Digitigrade, 355, 128. 
Diploria, 254, 204. 
Dipnoi, 316, 293. 
Diptera, 300, 24, 127, 173, 269, 270. 
“ see Fly, Mosquito. 
Discophora, 220. 
Distribution, 371-379. 
Divers, 328. 
Dog, 354. 
“ brain of, 171. 
skull of, 143. 
teeth of, 68. 
Dolichocephalic, 393. 
Dolphin, 349, 343. 
“ teeth of, 68. 
Doris, 274. 
Dove, 333, 316. 
Dragon-fly, 294, 263. 
“ flight of, 387. 
Duck, 331, 311. 
Duck-mole, 342, 331. 
Dugong, 350. 
“ heart of, 73. 
Duodenum, 90. 
Eagle, 334, 319. 
Ear, 179, 387, 152. 
Ear-shell, 278, 235, 246. 
Earth-worm, 269. 
“ alimentary canal of, 77. 
“ circulation in, 105. 
“ locomotion of, 162. 
“ nervous system of, 168. 
“ prehension of, 52. 
Ecderon, 127. 
Echidna, 342. 
Echinodermata, 257. 
“ number of species of, 221 
Echinoidea, 261, 28,39, 96, 97, 214. 
Echinus, 262, 214. 
“ see Sea-urchin. 
Edentata, 344, 101, 333, 334. 
Egg, fertilization of, 197. 
“ form of, 195. 
“ number of, 195. 
“ segmentation of, 197, 165. 
“ structure of, 192, 161,163. 
Elasmobranchii, 314, 287, 288. 
“ see Ray, Shark. 
Elephant, 350. 
“ brain of, 170, 
“ foot of, 129. 
“ skeleton of, 119. 
“ teeth of, 69, 36. 
“ trunk of, 66. 
“ tusks of, 71, 66,119. 
“ voice of, 189. 
Elytra, 297. 
Embryology, 197. 
Emu, 327. 
Enamel, 66, 31. 
Encephalon, 170. 
Enderon, 127. 
Endoskeleton, 127 
Entomostraca, 2S4, 255. 
Epiblast, 199. 
Epidermis, 34. 
Epiglottis, 119, 159. 
Epithelium, 33, 2. 
Equus, see Horse. 
Euplectella, 246. 
Excretion, 121,125. 
Exoskeleton, 127. 
Eye, of Invertebrates, ISO. 
“ of Vertebrates, 181. 
“ development of, 204. 
Facial Angle, 309. 
Falcon, 335. 
Family, 235. 
Fat, 38, 10. * 
Feathers, 137,105. 
“ development of, 204. 
Felis, 355. 
Fertilization of Egg, 197. 
Fibrine, 98. 
Fishes, 310. 
“ air-bladder of, 117, 48. 
“ alimentary canal of, 80, 48. 
“ blood of, 99,100, 65. 
“ brain of, 172, 139. 
“ circulation in, 107, 51, 75. 
“ eye of, 184. 
“ fins of, 158, 123. 
“ gills of, 114, 48. 
