552 



INDEX 



Mustelus, 343. 

 Mutation, 64, 90, 143. 

 Mycetozoa, 186, 187, 189-190. 

 Myotomes, 326. 

 Myriapoda, 182, 202, 255, 265. 

 Myrmecophaga jubata, 408. 

 Myrmecophiles, 302. 

 Mystacoceti, 414. 



Nacre (pearl), 250. 

 Nagana, 201, 206. 

 Nageli, 49. 



Nansen, Fridtjof, 468, 471. 

 Nature, I ; nature and nurture vs. 

 heredity and environment, 89-93. 

 Nautilus, 251. 

 Neanderthal man, 440, 489. 

 Nearctic Region, 448, 450. 

 Necturus, 320, 446. 

 Nekton, 475. 



Nemathelminthes, 180, 233-235. 

 Nematocera, 278. 

 Nematoda, 234, 235. 

 Nematomorpha, 234; the Gordius, 



234- 



Nemertinea, 180, 233. 



Neoceratodus (Barramunda), 344, 

 345 ; N. forsteri, 344. 



Neo-Laurentian (Proterozoic) Era, 

 148. 



Neotoma cinerea orolestes, 405. 



Neotropical Region, 448, 450. 



Nereis, 238. 



Nerves, u, 28-29, 334~3375 a ^~ 

 ferent and efferent n., 336; func- 

 tion of, 28; impulses, II, 33; 

 structure, 29; system, nervous, 



10, 334-337- 



Neural arch, 329. 



Neuroptera, 271, 273, 274. 



Newman, H. H., 38. 



Newton, Alfred, 395. 



Newton, Sir Isaac, 114. 



Nicholson, 232. 



Nictitating membrane, 379. 



Nitrogen, 31. 



Noctiluca, 189. 



Nomenclature, botanical and zoolog- 

 ical, 170. 



Notochord, 320, 326, 431. 

 Notophthalmus viridescens, 360. 

 Notoryctes, 398. 

 Notropis cornutus, 349. 

 Novius cardinalis, 309. 

 Nucleoplasm, 62. 

 Nucleus, 62, 65. 

 Nudibranchs, 246-248. 

 Nurture, nature and, 89-93. 

 Nyctereutes procyonides, 404. 

 Nymphs, 35, 270. 



Obelia commissuralis, 214. 



Oboraria ellipsis, 446. 



Ochotona saxatilis, 405. 



Octopus, 251. 



Odobaenus, 404. 



Odontoceti, 414. 



CEnothera gigas, 64. 



Oleander hawk moth, 287. 



Olfactory lobes, 336. 



Oligochaeta, 237, 239-241. 



Oligocene Epoch, 148, 418. 



Olor olor, 387. 



Ontogeny vs. phylogeny, 140. 



Onychophora (Prototracheata), 255, 



263. 

 Oocyte, 66, 67. 

 Oogenesis, 67. 

 Ooze, ocean, 477. 

 Opalina, 201. 

 Operculum, 248. 

 Ophidia, 364, 372. 

 Ophiuroidea, 222. 

 Opossum (Marsupial), 142. 

 Optic lobes, 336. 

 Ordovician Period, 148, 150. 

 Oreamnos montanus, 413. 

 Organs, 22-24, 138; structure of, 



22-24. 



Oriental Region, 448, 451, 452. 

 Ornithorhynchus, 396, 432. 

 Orohippus, 418. 

 Orthogenesis, 419-425. 

 Orthoptera, 269, 276, 281, 3I3-3 J 9; 



coloration, protective, 315-316; 



music of, 314-315; see Blattidse; 



Mantidae; Phasmidse; Protor- 



thoptersu 



