Nassa, 563 



Nassellaria, see Monopylaea 



Nattca, 563 



Nauplius larvae, 352; 324, 332, 338, 



339, 340, 342. 352, 354, 359, 368, 



373, 374, 375, 379, 382, 383, 385, 



389, 403, 415 

 Nautiloidea, 602, 603 

 Nautilus, 602; 588, 590, 599, 604; 



macromphalus, 604 

 Nebalta, 390; 329, 335, 336, 340, 348; 



bipes, 390, 390 

 Neck of Cestoda Merozoa, 225 

 Neck gland, see Dorsal organ ; organ 



(Nuchal organ), 342; 334, 356, 364 

 Nectocalyces, 166 

 Needham's sac, 598 

 Nematocysts, 148; 150, 166, 189,569 

 Nematoda, 244; 2, 130, 141, 197 

 Nematomorpha, 257; 197, 244 

 Nematus rihesii, 500 

 Nemertea, 233; 130, 197 

 Neoechinorhynchus, 259 

 Neoinenia, 549 

 Neosporidia, 100; 87, 88 

 Neoteny, 144 

 Neotermes, 469 

 Nepa, 474, 476 

 Nephridia, Nephridial system, 134; 



136, 140, 141, 197, 261, 275-8, 277, 



300 

 Nephrocytes, 437; 439 

 Nephromixia, 263, 276 

 Nephrops, 415; 332 

 Nephrostome, 263; 275, 276, 289, 



290 

 Nephthys, 277 

 Nereis, 268 ; 262, 264, 265, 272, 277, 



282, 283 

 Nerilla, 296 ; 295 

 Nerve-cord, see Nervous system 

 Nerve fibre, 137 and n. ; 138 

 Nerve net, 128, 136, 137, 138, 150; 



of acoelomate Triploblastica, 197; 



of Balanoglossus, 664; of Coelen- 



terata*, 149, 176, 195; of Echino- 



dermata, 626, 629; of Platy- 



helminthes, 198, 217; Origin of 



centres and nerves in*, 136, 137, 



150, 197, 198, 630, 664 

 Nerve rings, of Echinodermata, 630; 



of Medusae, 151, 152, 153, 156, 176 

 Nerves, 137; 136. See also Nervous 



system 



INDEX 711 



Nervous system, 136; 5, 128, 142; of 

 Acanthocephala, 259; of Anne- 

 lida*, 260; I, 261, 287, 289, 294, 

 300; of Arachnida*, 524, 529, 531, 

 539; of Arthropoda, 300; of 

 Brachiopoda, 6i6; of Chaeto- 

 gnatha, 618; of (Jhordata, 660; 2; 

 of Ciona, 675, 676, 677 ; of Coelen- 

 terata*, 149, 151, 156, 176, 195; of 

 Crustacea*, 340; 311, 373, 379, 

 383, 391, 392, 397, 413, 414; of 

 Echinodermata, 629, 638, 646, 650, 

 656; of Gastrotricha, 243; of 

 Hemichorda, 664, 668; of Insecta, 

 448 ; of Lithobius, 422 ; of Mol- 

 lusca*, 545, 549, 550, 554, 555, 

 570, 571, 572, 582, 596; of Nema- 

 toda, 245 ; of Nematomorpha, 257 ; 

 of Nemertea, 235 ; of Onycho- 

 phora, 322; of Platyhelminthes*, 

 198, 199, 217, 225; of Polyzoa, 

 606 ; of Rotifera, 237 



Neurones, 137 



Neuropodium, 265 



Neuroptera, 485 



Neuroterus, 500 



Nidamental glands, 591 



Noctiluca, 55 ; 48, 56 



Noctuidae, 491 



Nodosaria, 76; hispida, 13 



Nodus of Odonata, 472 



Notnada, 504 



Non-cellular animals, 7 



Notochord, 661 ; of ascidian tadpole, 

 675 ; of Hemichorda, 662, 664 



Notodelphys, 374 



Notonecta, 474, 476 



Notopodium, 265 



Notostraca, 360; 327, 354, 355 



Novius cardinalis, 495 



Nuchal sense organ, see Neck organ 



Nucleariae, 72 



Nuclei, in Metazoa and Protozoa, 7, 

 27; of pansporoblasts, 100; of 

 Protozoa, 22, 23 ; Plurality of, in 

 Protozoa, 10; Position of, in 

 choanocytes, 126 



Nucleoli, 22 



"Nucleus", of Rhizocephala, 384; of 

 Thaliacea, 686 



Nucula, 582; 544, 574, 579 



Nuda, 196 



Nudibranchiata, 567; 554 



Nummulites, 76 ; laevigatus, 75 



