INDEX. 
429 
Nervous System, 166. 
“ “ of Arthropoda, 169. 
“ “ Brain, 170. 
“ “ development of,199,167. 
“ “ of Mollusks, 168. 
“ “ Spinal Cord, 175. 
“ “ of Starfish, 168. 
“ “ Sympathetic, 175,146. 
“ “ of Vertebrates, 169. 
“ “ of Worms, 168. 
Neurapophysis, 140. 
Neurilemma, 40, 13. 
Neuroptera, 294, 263. 
“ see Dragon-fly. 
Neuroskeleton, 141. 
Newt, 318, 174, 296. 
Nomenclature, Zoological, 236. 
Notochord, 200,167. 
Notonecta, 297, 296. 
Nucleolus, 31,1. 
Nucleus, 31,1. 
Nutrition, 45. 
Nymph, 377. 
Ocelli, 1S1, 292,155. 
Octopus, 280. 
(Esophagus, 77-S9. 
(Estrus, 300. 
Olfactory Lobes, 172, 204. 
“ Nerves, 178,149. 
Oligochcetae, 269. 
Olive-shell, 278. 
Oniscus, 286. 
Operculum, 114,134, 273, 313, 112, 228. 
Ophidia, 320. 
“ see Snake. 
Ophiura, 260, 210, 213. 
Opisthobranchs, 274, 352, 230, 231. 
Opistlioccelous, 386. 
Opossum, 343, 332. 
Optic Lobes, 172, 204, 143. 
Orang-utan, 357, 353, 355. 
Order, 235. 
Organ, 41. 
Organism, 20, 22-28. 
Organization, 30. 
Organ-pipe Coral, 251, 200. 
Oriole, 339. 
Ornithodelphia, 341. 
Ornithognathous, 293. 
Ornithorhynchus, 342, 331. 
Orthoceras, 287. 
Orthoptera, 217, 295, 21, 264. 
“ see Grasshopper. 
Orycteropus, 344. 
Oscines, 338. 
Osculum, 245. 
Osseous Tissue, see Bone. 
Ossification, 36, 203. 
Ostrea, 272. 
“ see Oyster. 
Ostrich, 99, 327, 65, 305. 
Otoliths, 178, 150,151. 
Ovipositor, 293, 98. 
Owls, 335, 317. 
Ox, alimentary canal of, 90. 
“ foot of, 164, 352, 129. 
“ mouth of, 63. 
“ prehension of, 50, 54. 
“ teeth of, 69, 71, 352. 
“ see Ungulata. 
Oyster, anatomy of, SO, 44. 
“ circulation of, 106. 
“ development of, 205. 
“ eggs of, 195. 
“ heart of, 106, 44. 
“ mouth of, 56. 
“ prehension of, 50. 
“ respiration in, 113. 
“ see Clam, Lamellibranchiata. 
Palate, 61. 
Pallial Sinus, 271, 99. 
Palpi, 58, 21. 
Paludina, 278, 232, 244. 
Pancreas, 123, 91. 
Pancreatic Juice, 93. 
Pangolin, 344. 
Paper Nautilus, 280, 249. 
Papilio, 303. 
Papilla?, 63, 128, 94, 148. ' 
Paramecium, 32,191, 243, 188. 
“ see Infusoria. 
Parrot, 337, 320. 
“ tongue of, 62, 189. 
Partridge, 333. 
Patella, 147, 278, 29, 106. 
“ see Limpet. 
Pavement-teeth, 67, 32. 
Pearl-oyster, 272, 224. 
Pecten, 181, 272, 153. 
Pectoral Arch, 146. 
Pedicellarise, 77, 97. 
Pediculus, 297. 
Pedipalpi, 2S8, 259. 
“ see Scorpion. 
Pelias, 320, 298. 
Pelican, 84, 331. 
Pelvic Arch, 146. 
Penguin, 329, 306. 
Pennatula, 256, 208. 
Pentacrinus, 25S, 211. 
Pepsin, 93. 
Peptone, 93. 
Perch, skeleton of, 67, 135, 172, 65, 112, 
139, 283. 
Perchers, 337. 
Periosteum, 138, 157. 
Peristaltic Movement, 89. 
Peritoneum, 89. 
Periwinkle, 278. 
Petrel, 330. 
