610 



INDEX. 



Nautilus. Eye of, 90. 



Nebalia, -148. 



Necrophorus, 590. 



Nectocalyces, 246. 



Neraathclminthes, 343. 



Nematocalyces, 242. 



Nematocysts, 212. 



Nematus, 543, 594. 



Nemertes, 342, 343. 



Nemertini, 339. 



Nemocera, 577. 



Nemoptera, 564. 



Ncmura, 561. 



Nepa, 527, 534, 572. 



Nephelis, 400. 



Nephriclia, 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. 



Noctihica, 196. 



Noctuifoi'mes, 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. 



Nummuliua. 187. 



Nutritive polyp, 236. 



Nut-weevil, 588. 



Nycteribia 575 



Nymphaliadje, 585. 



Nymphula, 582. 



Obelia, 242. 

 Obisium, 51 1 . 

 Oceanidse, 234. 

 Ocellata, 239. 241. 



Ochracea, 195. 

 Octactinia, 230, 231. 

 Octobothrium, 324. 

 Octorchis, 242. 

 Ocular plates. 278. 

 Oculina, 232. 

 Oculinidae, 229. 

 Ocypoda, 478. 

 pdontolcse, 176. 

 Odontornithes, 175 

 Odontosyllis, 379. 

 Odynerus, 597. 

 (Ecodoma, 596. 

 (Edemera, 588. 

 (Edipoda, 558. 

 (Erstedtia, 340. 

 (Esophagus of Anthozoa, 



(iO. 



CEstridse, 542, 576. 

 (Estropsidfe, 564. 

 Oken, 137. 

 Olenus, 484. 

 Olfactory organs. 91. 

 Oligochasta, 382. 

 Olynthus, 217. 

 Ornalium. 590. 

 Onchocotyle, 324. 

 Oniscus, 460. 

 Ontophilus, 590. 

 Ouychophora, 512. 

 Oostegites of Arthros- 



traca, 451. 

 Opalinae. 204. 

 Operculata, 44(5. 

 Ophiactis, 292. 



Ophidiastcr. 273. 293. 



Ophioderma, 294. 



Ophioglypha, 294. 



Ophiolepis. 2H4. 



Ophion, 595. 



Ophiothrix, 294. 



Ophiura, 294. 



Ophiuridae,273, 275. 279. 



Ophiuridea, 291, 293. 



Ophiusidas, 583. 



Opisthomum, 313. 



Oral pole of Echinoder- 

 mata. 268. 



Orbitehe, 505. 



Orbulina, 187. 



Orchestia, 455. 



Ordensbander, 583. 



Organ, 25. 



Organ coral, 231. 



Oribates, 495. 



Orohippus, 172. 



Orthoptera, 554. 



Orthosia. 5s:i. 



Oryctes, 590. 



Orygia. 583. 



Osculum. 21(1. 



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. 



Pfedogenesis, 128 



Pagurus, 478. 



Painted Lady, 585. 



Palasaster, 292. 



Palasmon, 220. 477. 



Palaeocarabus, 469. 



Palseocrangon, 469. 



Palseontology, Evidence 

 in favoiir of descent 

 theory, 163 



Paleaj of Annelids. 368 



Palingeuia, 562. 



Palinurus, 477. 



Pali of Actiuozoa, 22S 



Pallas on domestic hy- 

 brids, 143 



Palp, 413, 523. 



Palpares; 564. 



Palpicornia, 590. 



Palps of Chffitopoda, 369. 



Pandora, 266. 

 ; Panorpidas, 563. 



Papilio, 585. 



Paraglossa, 524. 



Paramseccium, 205. 



Paramere, 27. 



Paranuclens. 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. 



Pedicellarife, 271. 



Pediculus, 568, 589. 



