INDEX 



805 



Nearctic region, 9* 



Nebalia, 552, 566, 567 



Nebeliacea, 552 



Neck, of cockroach, 603 



Nectocalyx, 161 



Nectonema, 299, 800, 301, 302, 303 



Needham's sac, 753*, 765 



Nekton, 8* 



Nemathelminthes, 293* : Appendix, 

 313 : Affinities and relationships, 31 5 



Nematocyst, 81*. 89, 90, 97, 133, 134* 



Nematoda, 292* : Example, 292 : Ex- 

 ternal characters, 293 : Body-wall, 

 293, 294 : Digestive organs, 294, 

 295 : Body cavity, 295 : Excretory 

 system, 296 : Nervous system, 296, 

 297 : Reproductive organs, 296, 297 : 

 Development, 297, 298, 303, 304 : 

 Distinctive characters and classifica- 

 tion, 298 : General organisation, 299 : 

 Life-history, 304 



Nematogene, 228, 229* 



Nematoidea, 299*, 301, 302 



Nematomorpha, 299*, 300, 302 



Nemertinea, 283, 284* : General fea- 

 tures, 284, 285, 286, 288, 289 : Body- 

 wall, 285, 286, 288 : Digestive canal, 



286 : Blood-vascular system, 286, 



287 : Excretory system, 286, 287 : 

 Respiration, 287, 288 : Nervous 

 system, 286, 288, 289 : Cerebral 

 organs, 286. 289 : Eyes, 289 : Stato- 

 cysts, 289 : Reproductive system, 

 289 : Development, 290 : Distinc- 

 tive characters and classification, 290 



Neomenia, 694. 695, 698, 699 



Neotropical region, 9* 



Nephelis, 504 



Nephridiopore, 438, 445, 494 



Nephridium, 429, 437*, 438. 449, 450, 

 467, 468, 487, 499, 500, 672 : pro- 

 visional, 469 



Nephrostome, 358, 438, 449, 467 



Nereides, 456*, 477 



Nereidiformia, 4^6* 



NEREIS, External features, 430, 431 : 

 Enteric canal, 432 : Ccelome, 432 : 

 Body-wall, 433 : Vascular system, 

 434, 435 : Nervous system, 436 : 

 Sense organs, 437 : Excretory organs, 

 437, 438 : Reproductive organs, 438 : 

 Individual variation, 439 : Develop- 

 ment, 440, 441, 442, 443 : Syste- 

 matic position, 455 



Nerilla, 492 



Nerve-cell, 30*. 31 



Nerve-fibres, 30*, 31 



Nerve ganglia, 38 



Nerve pentagon, 372 



Nervous system, 15, 30, 38*, 39 : Obelia, 

 133 : Leptolinse, 151 : Aurelia, 171 : 

 Tealia, 190: Hormiphora, 213: 

 Planaria, 234, 235 : Fasciola, 238 : 



Tcenia, 244: Platyhelminthes, 261, 

 262, 263 : Nemertinea, 288, 289 : 

 Ascaris, 296, 297 : Nematoidea, 302 : 

 Acanthocophala, 308 : Chretognatha, 

 311, 312: Bmcliionus, 320: Roti- 

 fera, 320, 327 : Dinophilea, 330 : 

 Gastrotricha, 330 : Polyzoa, 344 : 

 Endoprocta, 347 : Phoronis, 350 : 

 Magellania, 358 : Brachiopoda, 362 : 

 Starfish, 372 : Sea-urchin, 390 : 

 Holothurian, 394 : Antedon, 400 : 

 Echinodermata, 420 : Nereis, 436 : 

 Lumbriciis, 448, 449 : Chfetopoda, 

 465, 466 : Myzostomida, 478 : Echiu- 

 rida, 480, 48l : Sipunculus, 486, 487 : 

 Sipunculoidea, 486, 489 : Archi- 

 annelida, 491, 492 : Hirudo, 501 : 

 Hirudinea, 507 : Apus, 522, 523 : 

 Astacus, 541, 542 : Crustacea, 581 : 

 Peripatus, 594: Myriapoda, 601, 

 610, 611 : Periplaneta, 610, 611 : 

 Insects, 628, 629 : Scorpio, 641, 642 : 

 Arachnida, 653. 654 : Mussels, 673 : 

 Pelecypoda, 688, 689 : Arnphineura, 

 698. 699 : Triton, 710, 711 : Gastro- 

 poda, 725, 726 : Scaphopoda, 737 : 

 Sepia, 745, 746, 747, 748, 749 : 

 Nautilus, 762, 764 : Cephalopoda, 

 774 



Nervous tissue, 30* 



Nervures, 625* 



Neuraxis, 30*, 31 



Neurolemma, 30*, 31 



Neuronephroblast, 508* 



Neuropodium, 431*, 458 



Neurootera, 618*, 625, 632, 637 



New Zealand region, 9* 



Nicothoe, 561, 562 



Nidamental gland, 753* 



Noah's Ark shell, 678 



Noctiluca, 81 



Nodes, of Siphonophora, 161 



Nodosaria, 54 



Nomenclature, binomial, 1* 



Non-contractile vacuoles, 11*, 62, 95, 

 96 



Noteus, 324 



Notholca, 324 



Notommata werneckii, 328 



Notopodium, 431*, 458 



Notostraca, 550* 



Nuchal cartilage, 742 



Nuchal organs, 437* 



Nuclear membrane, 17*, 18, 82 



Nuclear sap, 17* 



Nuclear spindle, 18, 19* 



Nuclear ia, 60 



Nuclcolus, 18*, 20, 82 



Nucleus, 11*, 15, 17, 20, 21 



Nucnla, 677, 680, 683, 684, 685, 686, 

 688. 689, 692, 693 



Nudibranchia, 715*, 719, 723, 724, 73U 



NummuUtes, 54 



