010 



INDEX. 



Nautilus, Eye of, 90. 



Nebalia, 448. 



Necrophorus, 590. 



Nectocalyces, 246. 



Nemathelminthes, 343. 



Nematocalyccs, 242. 



Nematocysts, 212. 



Nematus, 543, 594. 



Nemertes, 342, 343. 



Nemertini, 339. 



Nemocera, 577. 



Nemoptera, 564. 



Nemura, 561. 



Ncpa, 527, 534, 572. 



Nephelis, 400. 



Nephridia, 308. 



Nephrops, 477. 



Nereilepas, 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. 



Notodelphys, 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. 



Nucleolus, 29. 



Nucleus, 12, 13, 29. 



Nucleus, Division of, 30. 



Nummulina, 187. 



Nutritive polyp, .236. 



Nut- weevil, 588. 



Nycteribia, 575 



Nymphaliadas, 585. 



Nymphula, 582. 



Obelia, 242. 

 Obisium, 511. 

 Oceanidse, 234. 

 Ocellata, 239, 241. 



Ocliracca, 195. 

 Octactinia, 230, 231. 

 Octobothrium, 324. 

 Octorchis, 242. 

 Ocular plates, 278. 

 Oculina, 232. 

 Oculinidae, 229. 

 Ocypoda, 478. 

 Odontolcas, 176. 

 Odontornithes, 175 

 Odontosyllis, 379. 

 Odynerus, 597. 

 (Ecodoma, 596. 

 CEdemera, 588. 

 (Edipoda, 558. 

 (Erstedtia, 340. 

 CEsophagus of Antliozoa, 



60. 



(Estridae, 542, 576. 

 (Estropsidas, 564. 

 Oken, 137. 

 Olenus, 484. 

 Olfactory organs, 91. 

 Oligochseta, 382. 

 Olynthus, 217. 

 Omalium, 590. 

 Onchocotyle, 324. 

 Oniscus, 460. 

 Ontophilus, 590. 

 Onychophora, 512. 

 Oostegitcs of Arthros- 



traca, 451. 

 Opalinae, 204. 

 Operculata, 446. 

 Ophiactis, 292. 

 Ophidiaster, 273, 293. 

 Ophioderma, 294. 

 Ophioglypha, 291. 

 Ophiolepis, 294. 

 Ophion, 595. 

 Ophiothrix, 294. 

 Ophiura, 294. 

 Ophiuridas, 273, 275.279. 

 Ophiuridea, 291, 293. 

 Ophiusidge, 583. 

 Opisthomum, 313. 

 Oral pole of Echinoder- 



mata, 268. 

 Orbitelas, 505. 

 Orbulina, 187. 

 Orchestia, 455. 

 Ordensbander, 583. 

 Organ, 25. 

 Organ coral, 231. 

 Oribates, 495. 

 Orohippus, 172. 

 Orthoptera, 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, 344, 348, 351. 



Pasdogenesis, 128 



Pagurus, 478. 



Painted Lady, 585. 



Paljeaster, 292. 



Palaamon, 220, 477. 



Palasocarabus, 469.; 



Palseocrangon, 49. 



Palaeontology, Evidence 

 in favour of descent 

 theory, 163 



Palese of Annelids, 368 



Palingcnia, 562. 



Palinurus, 477. 



Pali of Actinozoa, 228 



Pallas on domestic hy- 

 brids, 143 



Palp, 413, 523. 



Palpares, 564. 



Palpicornia, 590. 



Palps of Chsetopoda, 369. 



Pandora, 266. 



Panorpidre, 563. 



Papilio, 585. 



Paraglossa, 524. 



ParaniEeccium, 205. 



Paramere, 27. 



Paranucleus. 201. 



Parapodia, 305, 365. 



Parasita, 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. 



Pedicellarirc, 271. 



Pediculus, 568, 589. 



