Moth, 291. 
Moulting, 128, 130, 205. 
Mouse, 382. 
Mouths of Animals, 54. 
Mud-eel, 306. 
Mud-fish, 304, 
Murex, 266. 
Mus, 356. 
Musca, 290, 353. 
Muscle, 152. 
Muscular Tissue, 38, 152, 199, 
Mussels, 259. 
Myriapods, 76, 280, 353. 
Myrmecophaga, 330, 356. 
Mytilus, 259. 
Myxospongia, 349. 
Narts, 134. 
Natatores, 315, 355. 
Natica, 266, 352. 
Natural Selection, 220. 
Nautilus, 267, 352. 
Nereis, 272, 352. 
Nerve-cells, 163. 
Nerves, 163, 172. 
Nervous Tissue, 40, 164, 199. 
Neurilemma, 40. 
Neuropters, 284, 353. 
Newt, 306. 
Nictitating Membrane, 375. 
Notochord, 195. 
Nucleolus, 191. 
Number of Animals, 214. 
Nummulite, 349. 
Nutrition, 44. 
Nymph, 377. 
OoE tt, 178. 
Octopus, 268, 352. 
sophagus, 85. 
Olfactory Nerves, 175. 
Olive-shell, 266. 
Oniscus, 353. 
Ophidians, 308, 354. 
Ophiomorpha, 354. 
Ophiura, 251, 350. 
Opisthobranchs, 261, 352. 
Opisthocelous, 373. 
Opossum, 330. 
Orang-utan, 171, 344. 
Order, 227. 
Organization, 30. 
Organ-pipe Coral, 242. 
Organs, 41. 
Oriole, 327. 
Ornithorhynchus, 328, 355. 
Orthoceras, 266. 
Orthopters, 285, 353. 
INDEX. 3893 
Orycteropus, 330. 
Oscines, 325. 
Osseous Tissue, 36. 
Ossification, 36, 19S, 
Ostrea, 259, 351. 
Ostrich, 319. 
Otoliths, 175. 
Ovipositor, 283. 
Owls, 323. 
Ox, 150, 340. 
Oyster, circulation in, 105. 
described, 259. 
“development of, 200. 
‘© digestion in, 79. 
« mouth of, 54. 
« muscles of, 154. 
* prehension of, 50. 
«  yespiration in, 112. 
shell of, 131, 208. 
PatateE, 62, 85. 
Pallial Sinus, 379. 
Palpi, 58. 
Paludina, 265. 
Pancreas, 121. 
Pangolin, 330. 
Paper Nautilus, 268. 
Papille, 62, 126, 174, 373. 
Papilio, 353. 
Paramecium, 234, 349. 
Parrot, 322, 324. 
Partridge, 320. 
Patella, 263, 377. 
Pavement-teeth, 66. 
Pearl-oyster, 258, 373, 379. 
Peccary, 383. 
Pectoral Arch, 144. 
Pedicellariz, 76, 371. 
Pedipalpi, 277, 353. 
Pelican, 317. 
Penguin, 315. 
Pennatula, 247. 
Pen of the Squid, 373. 
Pentacta, 351. 
Pentacrinus, 249, 350. 
Perch, 146, 170, 354. 
Perchers, 324. 
Periosteum, 136. 
Peristaltic Movement, 870. 
Periwinkle, 266. 
Petrel, 317. 
Petromyzon, 303, 354. 
Phalanger, 330. 
Pharyngobranchs, 301. 
Pharynx, 72, $4, 370. 
Pheasant, 320. 
Phoca, 356. 
Physalia, 239, 350, 
