010 



1NDES. 



Nautilus, Eye of, 90. 



Nebalia, 448. 



Necrophorus, 500. 



Nectocalyces, 246. 



Nemathelminthes, 343. 



Nematocalyces, 242. 



Nematocysts, 212. 



Nematus, 543. 594. 



Nemertes, 342, 343. 



Nemertini, 339. 



Nemocera, 577. 



Nemoptcra, 564. 



Nernura, 561. 



Nepa, 527, 534, 572. 



Nephelis, 400. 



Nephridia, 308. 



Nephrops, 477. 



Nereilcpas, 379. 



Nereis, 379. 



Nerve fibre, 46. 



Nerve tissue, 45.. 



Nervous system, Grada- 

 tions of, 80. 



Nervures, 528. 



Neuromuscular cells, 80. 



Neuropodia of Annelids, 

 365. 



Neuroptera, 562. 



Niphargus, 455. 



Noctiluca, 196. 



Noctuiformes, 578. 



Noctuina, 583. 



Nomada, 597. 



Nonionina, 184. 



Notodelpliys, 435. 



Notodonta, 584. 



Notodromus, 428. 



Notommata, 401, 404. 



Notonecta, 572. 



Notopoda, 478. 



Notopodia of Annelids, 

 365. 



Notum, 525 



Nuclear fluid, 29. 



Nuclearia, 194. 



Nuclear plate, 30. 



Nuclear substance, 29. 



Nuclcolus, 29. 



Nucleus, 12, 13, 29. 



Nucleus, Division of, 30. 



Nummulina. 187. 



Nutritive polyp, 236. 



Nut-weevil, 588. 



Nycteribia, 575 



Nymphaliadse, 585. 



Nymphula, 582. .' 



Obelia, 242. 

 Obisium, 511. 

 Oceanidae, 234. 

 Occllata, 239, 241. 



Ochracea, 195. 

 Octactinia, 230, 231. 

 Octobothrium, 321. 

 Octorchis, 242. 

 Ocular plates, 278. 

 Oculina, 232. 

 Oculinidas, 229. 

 Ocypoda, 478. 

 Octontolcas, 176. 

 Odontornithes, 175 

 Odoiitosyllis, 379. 

 Odynerus, 597. 

 (Ecodoma, 596. 

 (Edemera, 588. 

 (Edipoda, 558. 

 (Erstedtia, 340. 

 (Esophagus of Antbozoa, 



60. 



(Estridae, 542, 576. 

 (Estropsidae, 564. 

 Oken, 137. 

 Oleuus, 484. 

 Olfactory organs, 91. 

 Oligochreta, 382. 

 Olynthus, 217. 

 Omalium, 590. 

 Onchocotyle, 324. 

 Oniscus, 460. 

 Ontophilus, 590. 

 Onychophora, 512. 

 Oostegites of Arthros- 



traca, 451. 

 Opalinre, 204. 

 Operculata, 446. 

 Ophiactis, 292. 

 Ophidiaster, 273, 293. 

 Ophioderrna, 294. 

 Ophioglypha, 291. 

 Ophiolepis, 294. 

 Ophion, 595. 

 Ophiothrix, 294. 

 Ophiura, 294. 

 Ophiuridse,273, 275. 279. 

 Ophiuridea, 291, 293. 

 Ophiusidas, 583. 

 Opisthomum, 313. 

 Oral pole of Echinoder- 



mata, 268. 

 Orbitelre, 505. 

 Orbulina, 187. 

 Orchestia, 455. 

 Ordensbander, 583. 

 Organ, 25. 

 Organ coral, 231. 

 Oribates, 495. 

 Orobippus, 172. 

 Orthoptern, 554. 

 Orthosia, 583. 

 Oryctes, 590. 

 Orygia, 583. 

 Osculum, 210. 



Osmia, 598. 

 Osmylus, 564. 

 Osteoblasts, 42. 

 Ostracoda, 423. 

 Otion. 445. 

 Otolith, 85, 239. 

 Otolith plate of Cteno- 



phora, 264. 

 Ovary, 97. 

 Ovipositors, 529. 

 Ovum, 33, 97. 

 Ovum, fertilization of 



109. 



Oxycephalus, 456. 

 Oxyrhyncha, 478. 

 Oxystomata, 478. 

 Oxytricha, 205. 

 Oxyuris, 244, 348, 351. 



Predogenesis, 128 



Pagurus, 478. 



Painted Lady, 585. 



Palreaster, 292. 



Paltemon, 220, 477. 



Palseocarabus, 469. 



Palfeocrangon, 469. 



Palaeontology, Evidence 

 in favour of descent 

 theory, 163 



Paleaj of Annelids, 368 



Palingenia, 562. 



Palinurus, 477. 



Pali of Actinozoa, 228 



Pallas on domestic hy- 

 brids, 143 



Palp, 413, 523. 



Palpares, 564. 



Palpicornia, 590. 



Palps of Chretopoda, 369. 



Pandora, 266. 



Panorpidse, 563. 



Papilio, 585. 



Paraglossa, 524. 



Paramasccium, 205. 



Paramerc, 27. 



Paranucleus. 201. 



Parapodia, 305, 365. 



Parasitn, 435. 



Parasitica, 567 



Parthenogenesis, 105, 

 410, 543. 



Parthenogenesis of Phyl- 

 lopoda, 418. 



Paste-worm, 357. 



Pauropus, 521. 



Peacock butterfly, 585. 



Pectinaria, 382. 



Pedal ganglion, 82. 



Pedata, 299. 



Pedicellariaj, 271. 



Pediculus, 568, 589. 



