INDEX. 



891 



Odynerus 766. 



Oecanthus 675 1 . 



Oeclus 806 2 . 



Oecobius 820 2 . 



Oecodoma 772 2 . 



Oedematopoda 715 2 . 



Oedemeridae 734 1 . 



Oediceropsis 501 l . 



Oedicerus 501 l . 



Oedipoda, brain 632, 

 tracheae, 632. 



Oedipodinae 672. 



Oenectra 720 2 . 



Oenocyte cells 629. 



Oestrus 752 2 . 



Oeta 823 1 . 



Offaster 246 1 . 



Ogcodes 748 1 . 



Ogmaster 190 1 . 



Ogyris 533 l . 



Ohiocrinus 294 2 . 



Oiceobathes 784. 



Oikoplasts 01. 



Oikopleura 61, 64, 65. 



Oikopleura dioica, her- 

 maphroditism of 17. 



Oil-beetle 733 1 . 



Oithona 406 1 . 



Olencira 489 2 . 



Olfactory organs In- 

 secta 635. 



Oligarces 742. 



Oligolophus 838, 842 ] . 



Oligoporus 239 l . 



Oligopygus 245 2 . 



Oligotoma 683 2 . 



Oligotrema 30 1 . 



Olpium 836. 



Ommatidium 329, num- 

 ber of 331. 



Oncaea 407 l , phos- 

 phorescence 397. 



Oncognathus 694 1 . 



Oneirophanta 267 1 , 

 stone-canal 254. 



Oniscomorpha 592. 



Oniscus 487, develop- 

 - ment 485, penis 

 483. 



Onychasteridae 206 2 . 



Onychophora 550. 



Oonops 821 2 . 



Ooperipatus 573. 



Oorhynchus 784. 



Oostegite 346, as epi- 

 podite 461, Malacos- 

 traca 439. 



Oozoite 48. 



Operculata 425. 



Operculum, Cephalo- 

 discus 106, Cirripedes 

 420. 



Opetia 749 1 . 



Ophiacantha 206 1 . 



Ophiactis 206 1 , absence 

 of bursae 203, canals 

 of Simroth 203, stone 

 canals 201, red cor- 

 puscles of 202. 



Ophiaethiops 206 2 . 



Ophiambyx 206 l . 



Ophiarachna 206 2 . 



Ophiarthrum 206 2 . 



Ophicephalous 224. 



Ophidiaster 191 2 , madre- 

 porites of 184, no 

 pedicellariae 173. 



Ophiernus 205. 



Ophioblenna 206 1 . 



Ophiobrachion 206 2 . 



Ophiobyrsa 206 2 . 



Ophiocamax 206 1 . 



Ophiocampsis 206 2 . 



Ophiocantha, arms of 

 194. 



Ophiocentrus 206 1 . 



Ophioceramis 205. 



Ophiochaeta 205. 



Ophiochiton 206. 



Ophiochondrus 206 2 . 



Ophiochytra 206 1 . 



Ophiocnemis 206 2 . 



Ophiocnida 206 1 . 



Ophiocoma 206 2 . 



Ophioconis 205. 



Ophiocreas 207 *. 



Ophiocten 206 l . 



Ophiocymbium 206 2 . 



Ophioderma 205. 



Ophiogeron 206 l . 



Ophioglypha arms 194. 



Ophiogona 205. 



Ophiogymna 206 2 . 



Ophiohelus 206 2 . 



Ophiolebes 206 1 . 



Ophiolepis 205. 



Ophiolipus 205. 



Ophiomastix 206. 



Ophiomastus 205. 



Ophiomaza 206 2 . 



Ophiomitra 206 l . 



Ophiomusium 205. 



Ophiomyces 206 1 . 



Ophiomyxa 206 2 . 



Ophioncus 205. 



Ophionellus 761. 



Ophionema 206 l . 



Ophionephthys 206 1 . ( 



Ophionereis 206 1 . 



Ophiopaepale 205. 



Ophiopeza 205. 



Ophiopezella 205. 



Ophiopholis 206 1 . 



Ophiophragmus 206 1 . 



Ophiophyllum 205. 



Ophiopinax 205. 



Ophioplax 206 l . 



Ophiopleura 205. 



Ophioplinthus 205. 



Ophioplocus 205. 



Ophiopluteus 204. 



Ophiopsammium 206 2 . 



Ophiopsila 206 1 . 



Ophiopteris 206 2 . 



Ophiopteron 206 2 , fin of 

 196. 



Ophiopus 206 1 . 



Ophiopyren 205. 



Ophiopyrgus 205. 



Ophiosciasma 206 1 . 



Ophioscolex 206 1 . 



Ophioseides 406 2 . 



Ophiosphaera 206 2 . 



Ophiostigma 206 1 . 



Ophioteresis 206 2 . 



Ophiothamnus 206. 



Ophiothela 208 2 . 



Ophiotholia 206'. 



Ophiothrix 206 2 , pedi- 

 cellariae of 196. 



Ophiothyreus 205. 



Ophiotoma 206 1 . 



Ophiotrema 206 1 . 



Ophiotrichoides 206 2 . 



Ophiotrochus 205. 



Ophiotyta 205. 



Ophiozona 205. 



Ophiura 205. 



Ophiurae 205. 



Ophiurids development 

 151. 



Ophiurinidae 206 2 . 



Ophiuroidea 194, num- 

 ber of arms, integu- 

 ment 194, skeleton 

 195, spines 196, mouth 

 armature 197, skele- 

 ton of disc 198, apical 

 system 199,. alimen- 

 tary canal, nervous 

 system 199, peri visce- 

 ral cavity 200, water- 

 vascular system 201, 

 axial organ 202, peri- 

 haemal system 202, 

 vascular tissue and 

 gonads, regeneration 



