408 
INDEX. 
Myrmecophaga, 344, 333. 
Mytilus, 270, 225. 
N ULS, 135. 
Narwhal, 223, 68. 
Natatores, 328. 
Natica, 27S. 
Natural Selection, 227, 
Nauplius, 211,177. 
Nautilus, 279, 247. 
Nematelminthes, 265, 218. 
Nereis, 268, 17. 
Nerve-cells, 40,132. 
“ fibres, 40, 13. 
“ kinds of, 167. 
“ velocity of impulse of, 167. 
Nervous System, 16S. 
(< 
44 
of Arthropoda, 169. 
(4 
44 
Brain, 170. 
(4 
44 
development of, 199, 67 
44 
44 
of Mollusks, 168. 
44 
44 
Spinal Cord, 175. 
44 
44 
of Starfish, 168. 
44 
44 
Sympathetic, 175,116. 
44 
44 
of Vertebrates, 169. 
44 
44 
of Worms, 168. 
Neuroptera, 294, 263. 
“ see Dragon-fly. 
Neuroskeleton, 141. 
Newt, 318, 296. 
Nomenclature, Zoological, 236. 
Notochord, 200, 167. 
Nucleolus, 31,1. 
Nucleus, 31,1. 
Nummulite, 242. 
Nutrition, 45. 
Nymph, 377. 
Ocelli, 1S1. 
Octopus, 2S0. 
(Esophagus, S6. 
Olfactory Lobes, 172. 
“ Nerves, 17S. 
Olive-shell, 278. 
Oniscus, 2S6. 
Operculum, 114,134, 228. 
Ophidia, 320. 
“ see Snake. 
Ophiura, 260. 
Opisthobranchs, 274, 352, 239, 231. 
Opisthocoelous, 383. 
Opossum, 342, 332. 
Optic Lobes, 172. 
Orang-utan, 357, 353. 355. 
Order, 235. 
Organ, 41. 
Organization, 30. 
Organ-pipe Coral, 251, 200. 
Oriole, 339. 
Ornithorhynchus, 342, 331. 
Orthoceras, 287. 
Orthoptera, 217, 295, 21, 264. 
“ see Grasshopper. 
Orycteropus, 344. 
Oscines, 338. 
Osseous Tissue, see Bone. 
Ossification, 37, 203. 
Ostrea, 272. 
“ see Oyster. 
Ostrich, 327, 305. 
Otoliths, 178,156. 
Ovipositor, 293. 
Owls, 335, 317. 
Ox, alimentary canal of, 90. 
“ foot of, 352,129. 
“ teeth of, 352. 
“ see Ungulata. 
Oyster, anatomy of, 80, 44. 
“ development of, 205. 
“ eggs of, 195. 
“ heart of, 106, 44. 
“ mouth of, 56. 
“ prehension of, 50. 
“ respiration in, 113. 
“ see Clam, Lamellibranchiata. 
Palate, 61. 
Pallia! Sinus, 271, 99. 
Palpi, 58, 21. 
Paludina, 27S, 244. 
Pancreas, 123, 91. 
Pancreatic Juice, 93. 
Pangolin, 344. 
Paper Nautilus, 280, 249. 
Papilio, 303. 
Papillae, 12S, 148. 
Paramecium, 243,188. 
“ see Infusoria. 
Parrot, 337, 320. 
“ tongue of, 62. 
Partridge, 333. 
Patella, 278. 
Pavement-teeth, 67,. 32. 
Pearl-oyster, 224. 
Pectoral Arch, 146. 
Pedicellariae, 77, 97. 
Pedipalpi, 28S. 
“ see Scorpion. 
Pelias, 320, 298. 
Pelican, 331. 
Penguin, 329, 306. 
Pennatula, 256, 208. 
Pentacriuus, 258, 211. 
Pepsin, 93. 
Peptone, 93. 
Perch, skeleton of, 112. 
Perchers, 337. 
Periosteum, 138. 
Peristaltic Movement, 8a>. 
Periwinkle, 278. 
Petrel, 330. 
Petromyzon, 314, 286. 
