INDEX 



Brachiopoda, 341 : Starfish, 350 : Sta- 

 iirchin, 367 : Holothurian, 370: Antt- 

 don, 375 : Echinodermata, 394 : Nerti*, 

 409, 410 : Liniihrirn.y, 422 : Cha-topoda, 

 437 : Mvgostoinida, 448 : Sipunculun, 

 453 : Gephyrea, 457 : Archi-annelida, 

 464 : ffiritdo, 472 : Hirudinea, 478 : 

 Apux, 492 : Astacus, 513 : Crustacea, 

 550 : P<:i'ipatu, 562 : Myriapoda, 569 : 

 Periplamta, 578 : Insects, 594, 595 : 

 Scorpion, 609 : Arachnida, 621 : Mns- 

 xds, 641 : Pelecypoda, 657 : Amphi- 

 neura, 666, 667 : Triton, 679 : Gastro- 

 poda, 693 : Scaphopoda, 706 : Rhodope, 

 707: Sepia, 717, 719: Natttihu, 734: 

 Cephalopoda, 744 



Nervous tissue, 27 



Neurilemma, 27*, 28 



Neuropodium, 405*, 430 



Neuroptera, 584*, 598 



Nicothfr, 530, 531 



Nidamental gland, 724* 



Noah's Ark shell, 646 



NoctUucvt, 74 



Nodosuria, 53 



Nomenclature, binomial, 1* 



Non-Calcarea, 103* 



Xottti*, 305 



Notlwlca, 305 



Uotommata iverneckii, 309 



Notopodium, 405*, 430 



Nuchal cartilage, 712 



Nuclear membrane, 15*, 17 



Nuclear sap, 16* 



Nuclear spindle, 16*, 17 



Nuclearia, 57 



Nucleolus, 15*, 17 



Nucleus, 11*, 15, 17 



Nucula, 646, 652, 653, 654, 655, 656, 

 657, 658 



Nudibranchia, 684*, 705 



ffiummtuites, 53 



NyHotheru*, 83, 85, 86 



Ifymphon hiyjidum, 625 



771 



Oligochgeta, 4~2 



Ommatidium, 494*, 495 



Oitchidium, 695, 704 



Onirn*, 543, 546 



Onychophora, 484, 559, 629 See Peri- 



patus 



Ocecium, 314 

 Oosperm, 20* 

 Oostigite, 544* 

 Oostigopod, 489* 

 Opaliiui, 84, 89 



Operculum (Gastropoda), 673*, 674, 688 

 Ophioglypha, 386 

 Ophiurida, 378* 

 Ophiuridea, 346, 378*, 382, 383, 384, 385, 



386, 387, 392, 393, 394, 395, 398, 399, 



400 



Ophryodendron, 91 

 Ophryoylena, 85 

 Opisthobranchia, 684" 

 Opossum-Shrimp, 523 

 Orchtvtia, 543, 548 

 Order, 4* 



Organic evolution See Evolution 

 Organism, 1* 

 Organ-pipe Coral, 182 

 Organs, 29* 

 Orthonectidce, 218 

 Orthoptera, 584* 

 Orthoptera genuina, 587 

 Owardla, 108 

 0>icaria, 106 



Osphradium, 642*, 657, 676, 695, 729, 743 

 Ostracoda, 521", 527 

 Ostrea, 647, 652, 656, 658, 660 

 Otocyst, 37*, 125* 

 Ovariole, 580*, 597 

 Ovary, 37* 

 Oviduct, 38* 

 Oviparous, 38* 

 Ovum, 18*, 28 

 Oxygen, oxidation, 34 

 Oxyurit, 285 







'DELIA, General structure, 118, 120: 

 Microscopic structure, 121, 122: Me- 

 dusa?, 124, 125, 126: Comparison of 

 polype with medusa, 126, 127, 128 : 

 Reproduction, 129: Development, 129 : 

 Systematic position, 132 



Octopoda, 736*, 738, 750 



Octo2>ti, 737, 739, 742 



Off or chandra, 139 



Odentophora, 676*, 678 



(Esophagus See Digestive system 



Oikomona*, 66, 67 



LACBYCHALINA, ill* 



Paedogenesis, 39*, 211*, 266, 598 

 Payuru*, 539 

 Paloemon, 538 

 Palffimonetex, 547 

 Palaeocrinoidea, 380* 

 Palaeodictyoptera, 604 

 Palseo-echinoidea, 379* 

 Palaeonemertinea, 273* 

 PaLeontology, 6* 

 Palinurus, 537, 549, 553 

 Palinnrn* rA/rw, 556 

 Pallial line, 634* 



