Necturns, 549 

 Nematocyst, 91, 92, 93 

 Nematoda, 134 



and Arthropoda, resemblances 

 between, 146 



life-histories of, 141 

 Neoceratodus, 546 

 Neognathae, 550 

 Neopallium, 460, 610 

 Nepa, 250 

 Nephridia, 189 



of earthworm, 163, 164 



of lancelet, 305 



of leech, 182 

 Nephridiopores, 160, 164 

 Nephridiostome, 164, 165 

 Nephrocoele, 615 

 Nephrocoelomostome, 615 

 Nephromixium, 189 

 Nephrostome, 615 

 Nephrotome, 564, 615 

 Nereis, 184 



cultrifera, 175, 176 



diver sicolor, 194 

 Nerve, abducent, 342, 388 



acoustic or auditory, 569 



antennary, of cockroach, 236 



anterior laryngeal, 463 



auditory, 343, 469 



brachial, 386 



buccal, 343 



depressor, 463, 482 



external mandibular, 388 



facial, 388, 463, 469, 612 



glossopharyngeal, 343, 388, 463, 

 469, 612 



hyomandibular, 343 



hypoglossal, 343, 384, 388, 463 



laryngeal, 388 



lateral line, 344 



mandibular, 342 



maxillary, 342 



oculomotor, 342 



olfactory, 342, 463 



ophthalmic, 342, 343 



optic, 342, 463, 466 

 of cockroach, 236 



palatine, 343 



pathetic, 342 



pharyngeal, 463 



phrenic, 463 



pneumogastric. See Vagus 



postspiracular, 343 



post-trematic, 343 



prespiracular, 343 



pretrematic, 343 



profundus, 342 



recurrent laryngeal, 463 



INDEX 753 



Nerve, sciatic, 386, 463 



spinal accessory, 343, 388, 463, 



569 

 superficial ophthalmic, 342, 343 

 terminal, 342 

 trigeminal, 342, 388, 463 

 trochlear, 342 

 vagus, 343, 388, 463, 612 

 Nerves, 533 



composition of, 458, 6ir 



cranial, 338, 388, 415, 463 



mixed, 611 



motor (efferent), 458, 611 



sensory (afferent), 458, 611 



somatic, 612 



spinal, 337, 384, 463, 610 



sympathetic. See Sympathetic 



system 

 visceral, 612 

 Nerve-components, 611 

 -cord of cockroach, 236 



of crayfish, 212 



of earthworm, 167 



of lancelet, 302, 307, 308 



of vertebrates. See Spinal cord 

 -cords of Ascaris, 137 



of liver fluke, 122 



of starfish, 288 



of TcBuia, 129 

 -endings, 520, 535 

 fibres, 458, ^12 

 -muscle junction, 612 

 net, 94, 131, 288, 296 

 rings of medusa, 106 

 Nervous impulses, 612 

 system, 18, 607 



formation of, in vertebrates, 636 



autonomic, 388, 458, 463, 

 613 



of Ascaris, 137 



of cockroach, 236 



of crayfish, 211 



of dogfish, 336 



of earthworm, 167 



of frog, 382, 383 



of Hydra, 93 



of lancelet, 307 



of leech, 183 



of liver fluke, 122 



of medusae, 106 



of pigeon, 415 



of rabbit, 458 



of snail, 268 



of starfish, 288 



of swan mussel, 280 



of tapeworm, 129 

 tissue, 506, 5JJ 

 Nervures, 229 



