892 



INDEX. 



and fission 203, lar- 

 vae 204, habits and 

 geological history 

 204, classification 205. 



Ophthalmopaches 406 2 . 



Opilioacarus 848'. 



Opilionidae 837. 



OpisSOl 1 . 



Opisthacanthus 806-. 



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 . 



Orectochilus 727'. 



Oreophorus 544 '. 



Orgyia 718 1 . 



Oribata 848 '. 



Orientation Crinoids 27 1 . 



Orithyia 544 2 . 



Orneodidae 720 -. 



Ornithodoros 849'. 



Ornithoptera 713 2 . 



Orobia 670 -. 



Orophoorinus 313. 



Orphania 531 -. 



Orphnaeus 602'. 



Orphnephila 745'. 



Orphnurgus 267 ', stone- 

 canal 254. 



Orsolobus 821 2 . 



Ortalidae 750 2 . 



Orthocidaris 239 2 . 



Ortholophus 241 2 . 



Orthopsis 241 l . 



Orthoptera 664. mimi- 

 cry 673. 



Orya 602. 



Oryssus 757. 



Osachila 544 2 . 



Oscinis 750'. 



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 '. 



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. 



Otodec-tes 852'. 



Otostigmus 602 2 , stig- 

 mata 599. 



Ourozeuktes 489 2 . 



Ova Balanoglossida 95, 

 Echinoderms 134. 



Ovigerous frenum Le- 

 pas 421. 



Ovipositor 623. 



Ovoid gland 130. 



OxusSSl 1 . 



Oxybelus 769'. 



Oxycephalus 502 2 , oto- 

 sacs 496. 



Oxycornia 33. 



Oxyethira 707 2 . 



Oxyhaloa 668 '. 



Oxynaspis 423 2 . 



Oxyopes 826 1 . 



Oxypleurites 855 2 . 



Oxyptilus 720 '. 



Oxyrhyncha 544 2 . 



Oxystomata 544. 



Oyster-shell scale 701 l . 



I'adiycheles 542'. 



Pachygnatha 823 2 . 



Pachygrapsus, effect of 

 parasites on 446, para- 

 site of 49 1 1 . 



Pachyiulus 593 2 . 



Pachylaena 27 '. 



Pachylasma 425 2 . 



Pachylichus 854 1 . 

 Pachylomerus 819. 

 Pachypsylla 698 '. 

 Pachysoma 407 '. 

 Pachystylis 476. 

 Pachytylus 67 1 2 , 672 2 . 

 Pacuila823 l . 

 Paedogenesis 640, 742 2 . 

 Paelopatides 267 1 . 

 Pagida 824 2 . 

 Pagurids, parasite on 



49 1 2 . 



Paguristes 540 '. 

 Pagurus 540 1 , kidney of 



524 2 . 



Palaeaster 188. 

 Palaeechinoidea 238. 

 Palaeechinus 239 '. 

 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 ] . 

 Palaeocrangon 358 2 . 

 Palaeocrinoids 290. 

 Palaeodiscus 188. 

 Palaeodiscus 239'. 

 Palaeomicra 721 l . 

 Palaeopalaemon 358 2 . 

 Palaeophiura 205. 

 Palaeophlebia 688-. 

 Palaeophonus 806 '. 

 Palaeopneustes 246 2 . 

 Palaeostoma 247. 

 Palaeotropus 247. 

 Palasanea 819. 

 Palasterina 188. 

 Palicus 548 1 . 

 Palinositus 535 2 . 

 Palinurellus 535-. 

 Palinurus 535 2 , gills of 



518 2 , larvae 451. 

 Pallasea 501 2 . 

 Pallene 784. 

 Palmipes 191 J , rays of 



167, form of body 168. 

 Palpares 703 '. 

 Palpigradi 827. 

 Palpimanua 822'. 



