892 



INDEX. 



and fission 203, lar- 

 vae 204, habits and 

 geological history 

 204, classification 205. 



Ophthalmopaches 406 2 . 



Opilioacarus 848 1 . 



Opilionidae 837. 



Opis 501 !. 



Opisthacanthus 806 2 . 



Opisthogoneata 578. 



Opisthopatus 573. 



Opisthophthalmus 806 2 . 



Opisthosoma 775. 



Oral papillae Ophiurids 

 197. 



Oral plates Echinoderms 

 121. 



Oral skeleton Ophiurids 

 196. 



Oral system of plates 

 Echinoderms 121. 



Oral tube feet Echinoids 

 233. 



Oral valves Holothu- 

 rians 251. 



Orals Crinoids 279. 



Orange-tips (butterflies) 

 713. 



Orbital grooves 517. 



Orbitremites 312. 



Orchestia 502 1 , gills of, 

 gonads of 498. 



Orchestina 821 2 . 



Orcula 268 2 . 



Oreo toe hilus 727 1 . 



Oreophorus 544 1 . 



Orgyia 718 1 . 



Oribata 848 1 . 



Orientati on Crinoids 271. 



Orithyia 544 2 . 



Orneodidae 720 2 . 



Ornithodoros 849 1 . 



Ornithoptera 713 2 . 



Orobia 670 2 . 



brophocrinus 313. 



Orphania 531 2 . 



Orphnaeus 602 1 . 



Orphnephila 745 *. 



Orphnurgus 267 1 , stone- 

 canal 254. 



Orsolobus 821 2 . 



Ortalidae 750 2 . 



Orthocidaris 239 2 . 



Ortholophus 241 -. 



Orthopsis 241 ^ 



Orthoptera 664, mimi- 

 cry 673. 



Orya 602. 



Oryssus 757. 



Osachila 544 2 . 



Oscinis 750 l . 



Osmia 764 2 , 768. 



Osmylus 704 2 . 



Ostracoda 382, appen- 

 dages 383, nervous 

 system, sense organs, 

 gut 386, development 

 388, habits, fossils, 

 affinities 389, sperma- 

 tozoa, 388, vascu- 

 lar system, respira- 

 tion, excretion, go- 

 nads 387. 



Othnius 734 1 . 



Otiocerus 697 1 . 



Otocysts Amphipoda 

 496, cerebral of Am- 

 phipods 502 2 , Arth- 

 ropoda 337, and func- 

 tion of in Crus- 

 tacea 350, Echino- 

 derms 126, Holothu- 

 rians 256, Isopoda 

 482, Schizopods 467, 

 Tanaidacea 478. 



Otodectes 852 l . 



Otostigmus 602 2 , stig- 

 mata 599. 



Ourozeuktes 489 2 . 



Ova Balanoglossida 95, 

 Echinoderms 134. 



Ovigerous frenum Le- 

 pas 421. 



Ovipositor 623. 



Ovoid land 130. 



Oxybelus 769 l . 

 Oxycephalus 502 2 , oto- 



sacs 496. 

 Oxycornia 33. 

 Oxyethira 707 2 . 

 Oxyhaloa 668 ^ 

 Oxynaspis 423 2 . 

 Oxyopes 826 1 . 

 Oxypleu;ites 855 2 . 

 Oxyptilus 720 1 . 

 Oxyrhyncha 544 2 . 

 Oxystomata 544. 

 Oyster-shell scale 701 l . 



Pachycheles 542 1 . 

 Pachygnatha 823 2 . 

 Pachygrapsus, effect of 



parasites on 446, para- 



site of 49 1 1 . 

 Pachyiulus 593 2 . 

 Pachylaena 27 1 . 

 Pachylasma 425 2 . 



Pachylichus 854 1 . 

 Pachylomerus 819. 

 Pachypsylla 698 1 . 

 Pachysoma 407 *. 

 Pachystylis 476. 

 Pachytylus 67 1 2 , 672 2 . 

 Paculla 823 l . 

 Paedogenesis 640, 742 2 . 

 Paelopatides 267 1 . 

 Pagida 824 2 . 

 Pagurids, parasite on 



49 1 2 . 



Paguristes 540 1 . 

 Pagurus 540 1 , kidney of 



524 2 . 



Palaeaster 188. 

 Palaeechinoidea 238. 

 Palaeechinus 239 1 . 

 Palaegyge 491 2 . 

 Palaeinachus 359 l . 

 Palaemon 533 2 , colour 



change 444, eye of 



329, 330, otocyst of 



350, zoaea 451. 

 Palaemonella 533 2 . 

 Palaemonetes larvae 



449, zoaea 451. 

 Palaemontes 533 2 . 

 Palaeobrissus 246 2 . 

 Palaeocaris 358 2 462, 



463- 



Palaeocoma 188. 

 Palaeocorystes 359 l . 

 Palaeocrangon 358 2 . 

 Palaeocrinoids 290. 

 Palaeodiscus 188. 

 Palaeodiscus 239 ^ 

 Palaeomicra 721 l . 

 Palaeopalaemon 358 -. 

 Palaeophiura 205. 

 Palaeophlebia 688 2 . 

 Palaeophonus 806 1 . 

 Palaeopneustes 246'-. 

 Palaeostoma 247. 

 Palaeotropus 247. 

 Palasanea 819. 

 Palasterina 188. 

 Palicus 548 l . 

 Palinositus 535 2 . 

 Palinurellus 535-. 

 Palinurus 535 2 , gills of 



518 2 , larvae 451. 

 Pallasea 501 2 . 

 Pallene 784. 

 Palmipes 191 1 , rays of 



167, form of body 168. 

 Palpares 703 *. 

 Palpigradi 827. 

 Palpimanus 822 \ 



