828 



TNDEX 



organs, 787 : Reproductive organs, 

 787, 788 : Systematic position, 790 



Neartic region, 9* 



Ndwlia, 566, 579, 581 



Neck, of cockroach, 620 



Nectocalyx, 159* 



Necturus, 304 



Needham's sac, 774*, 788 



Nekton, 8* 



Nematomorpha, 304*, 305, 307 



Nemathelmintb.es. 297* : Appendix, 319 : 

 Affinities and relationships, 320 *~^ 



Nematocyst, 78, 79, 87, 95, 133* 



Nematoda, 297* : Example, 297 : Ex- 



. , ternal characters, 305 : Body-wall, 305 : 

 Enteric canal, 305, 306 : Ccelome, 307 : 

 Excretory canal, 307 : Nervous system, 

 307 : Eye-spots, 307 : Reproductive 

 organs, 307 : Development, 308, 309 : 

 Life-history, 310 



Nematogene, 231* 



Nematoidea, 304*, 307 



Nematomorpha, 304*, 305, 307 



Nemertinea, 288,295* : General features, 

 288, 289, 291, 293 : Body-wall, 290 : 

 Alimentary canal, 290 : Blood-vessels, 

 291, 293 : Excretory vessels, 292, 293 : 

 Nervous system, 291,292, 293: Cerebral 

 organs, 291, 294 : Eyes, 294 : Stato- 

 cysts, 295 : Reproductive system, 295 : 

 Development, 294, 295 : Distinctive 

 characters and classification, 295 



Neomenia, 713, 714, 717, 718 



Neotropical region, 9* 



Nephelis, 516 



Nephridiopore, 448, 455, 506 



Nephridium, 439, 448*, 460, 461, 479, 

 495, 511, 689 



Nephridium, provisional, 481 



Nephrostome, 365, 448, 461 



Nereidce, 466*, 488 



Nereidiformia, 466* 



Nereis, External features, 440, 441 : 

 Enteric canal, 442, Ccelome, 442 : Body- 

 wall, 443 : Vascular system, 444 : 

 Nervous system, 446 : Sense-organs, 

 447 : Excretory organs, 448 : Repro- 

 ductive organs, 449 : Individual varia- 

 tion, 449 : Development, 450, 451, 452, 

 453 : Systematic position, 466 



Nerve-cell, 29*, 30 



Nerve-fibres, 29*, 30 



Nerve ganglia, 38 



Nerve pentagon, 379 



Nervous system, 14, 29, 37*, 38 : Obelia, 

 132 : Leptolina;, 151 : Aurelia, 172 : 

 Tealia,\92: Hormiphora,2\6: Planaria, 

 238 : Fasciola, 241 : Tamia, 248 : Platy- 

 helminthes, 266, 267 : Nemertinea, 

 291, 292, 293: Ascaris, 301, 302: 

 Nematoda, 307 : Acanthocephala, 313 : 

 Chaetognatha, 317 : Brachionus, 326 : 

 Rotifera, 334 : Dinophilea, 337 : Gastro- 



tricha, 336 : Polyzoa, 351 : Endoprocta, 

 354 : Phoronis, 357 : Mage/lania, 365 

 Brachiopoda, 369 : Starfish, 379 : Sea 

 urchin, 398 : Holothurian, 402 : Ante 

 don, 408 : Echinodermata, 429' 

 Nereis, 446 : Lumhricus, 459 : Chseto 

 poda, 476 : Myzostomida, 490 : Sipun 

 cuius, 494 : Gephyrea, 498 : Archi 

 annelida, 504 : Rirudo, 513 ; Hiru 

 dinea, 520 : Apiis, 534, 536 : Astacus 

 555 : Crustacea, 596 : Peripatus, 609 

 Myriapoda, 617, 626, 627 : Periplaneta 

 626, 627 : Insects, 643, 644 : Scorpio 

 657, 658 : Arachnida, 670 : Mussels 

 690 : Pelecypoda, 706 : Amphineura 

 715, 717 : Triton, 729 : Gastropoda 

 745 : Scaphopoda, 757 : Rhodope, 758 

 Sepia, 767 : Nautilus, 787 : Cephalo- 

 poda, 797 



Nervous tissue, 29 



Nervures, 639* 



Neuraxis, 29*, 30 



Neurilemma, 29*, 30 



Neuronephroblast, 521* 



Neuropodium, 441*, 468 



Neuroptera, 633*, 640, 647, 653 



New Zealand region, 9* 



Nicothoe, 576 



Nida mental gland, 775* 



Noah's Ark shell, 695 



Noctiluca, 79 



Nodes, of Siphonophora, 161 



Nodosaria, 53 



Nomenclature, binomial, 1* 



Non-contractile vacuoles, 11*, 60 



Noteus, 331 



Notholca, 331 



Notommata wernecMi, 335 



Notopodium, 441, 468 



Notostraca, 563* 



Nuchal cartilage, 763 



Nuchal organs, 447*, 448 



Nuclear membrane, 16*, 17, 80 



Nuclear spindle, 17* 



Nuclearia, 58 



Nucleolus, 16*, 19, 80 



Nucleus, 11*, 16, 19 



Nucula, 695, 698, 701, 702, 703, 706, 707, 

 710 



Nudibranchia, 734*, 738, 742, 744, 756 



Nummulites, 53 



Nyctiphanes, 568 



Nyctothertis, 92, 94, 95 



Nymphon hispidium, 674 







o 



beija, General structure, 128, 130 : 

 Microscopic structure, 131, 132 : 

 Medusae, 134, 135, 136 : Comparison 

 of polype with medusa, 136, 137, 138 : 



