INDEX 



821> 



Reproduction, 139: Development, 188 : 



Systematic position, 142 



Ooolusor muscle, •'{.mi 

 Ocelli, 148. 173 



Octopoda. 680, 790*, 791, 7!I8, 7!)7, 804 

 Octoptu, 791. 793, 798 

 Octorchandra, 150 

 Ocular plaits. 396. :>'.»7 

 Odentophora, 670*, 678 

 Odontophore, 721, 726, 727 

 (Esophagus See Digestive system 

 OihomonaSi 71. 72 

 Olfactory organs, 39 i pits, 173* 

 Oligochata. 465*, 168, 409, 471, 478, 474, 

 175, 478, 479, 4Sl, 482, 4S8, 486, 488, 

 489 

 OhiuthiK, 116 

 Ommatidium, 536*, 537 

 Oii'/titliinii, 74U 

 Ontsctw, 568, 583, 587 

 Onychophora, 526, 607*, 677, 678— See 



Peripatus 

 ( )ociuin. 841 

 < lokinete, 87* 

 Oosperm, 21* 

 Oostegites. 585* 

 Oostegopod, ">31* 

 Ootype, 243, 270, 271 

 Opattm, 93, 98, 99 

 Opalinqpeu, 94 

 Operculum Radiolaria, "61, 62: Ciliata, 



95. 98 : Gastropoda, 723*, 724. 780 

 Opkiogljfpha, 420 



Ophiuroidea. Distinctive characters and 

 classification, 411*: General form and 

 symmetry, 41.~> : System of plates, 

 418 : Modifications of form. 420. 421 : 

 Coelome, 42."» : Amlmlacral system, 

 426; Blood-vascular s3'Stem, 42(i : 

 Sauna] system, 427: Axial organ, 

 428 : Enteric canal, 428 : Nervous 

 system. 429 : Reproductive organs, 

 429: Development, 480: Ethology, 

 &c, 434 

 Ophrydhtm, 95, 97 

 Ophryod* ndron, 100 

 Ophryoi/1) na, 94 

 Opistho'brancnia, 734*, 738, 744, 745' 



7").") 

 Opisthogoneata, 615*, 619, 677 

 OpiethtrckU mnensM, 288 

 Opossum-Shrimp, 523 

 Optic gland, 772 

 Optic vesicle, 802 

 Oral, 376*: Arms, 170* 

 Orekeatia, 588, 594 

 Order, 4* 



Organ of Bojanus, 689*: cf. Owen, 780* 

 Organic evolution — See Evolution 

 Organism, 1* 

 Organ-pipe Coral. 1!)."> 

 Organs, 81* 

 Oriental region, 9* 



VOL. I. 



Orobdeila, 516 



Orthocaxu, 803 



Orthonecticke, 230, 232, 233, 234 



Orthoptera, 682*, 638, 640, 653 



Othoptera genuina, 636 



Oeeamfa, 117 



Oncaria, 115 



Oscular sphincter, 111* 



Osculum, 106* 



Osphradium, 691, 707, 731, 707 



Ossicles, 375 



Ostia, 106*, 109, 533* 



Ostium, 187* 



Ostracoda, 564*, 572, 573, 593, 594, 597, 



598, 601, 602 

 Oslrea, 696, 698, 701, 706, 708, 709 4 



Otocyst, 39*, 478 

 Ovariole, 628*, 646 

 Ovary, 39* 

 Ovicells, 352 

 Oviduct, 40* 

 Oviparous, 40* 

 Ovipositor, 610 

 Ovum, 19*, 30 

 Owen, organ of, 780 

 Oxygen, oxidation, 86 

 Oxeole spicules, 108, 110* 

 Oxyiiri*. 307 

 Oysters, 680, 696 



-* ACHYCHALINA, 121 

 Pedogenesis, 41*, 224*, 647 

 Pagurus, 569, 589 

 PaUemon, 569, 588 



P'lln monfites, 593 



Pahearctic region, 9* 



Palaeodictyoptera. 652 



Paheontologv, 6* 



Pnllnuriix, 589, 587, 595, 599, 602 



Pallial line, 683* 



Pallial groove, .844 



Pallial sinus, 365 



Pallial muscles, 684 



Pallial complex, 735 



Pallium— See Mantle 



Palpus, 470 



Patudicella, 348, 353 



Pallidum, 754 



Pains, 205* 

 Paiytkoa, 127, 197 

 Pancreas, 34* 

 Pancreatic juice, 34* 

 PnnihifiiKi. 72. 78, 74, 7-"> 

 Papula, 424* 



Parapodium, 439, 440, 441, 468, 739 

 Paragastric cavitv, 106*, 108 

 P.iragnatha, 530*, 548 

 Paramaeidas, 91 



Pak.\M(Kcm-m, 88, 89, 90 : Systematic- 

 position, 91 



3 a 



