766 
Nerves, structure of, 288 
thoracic, of imago, 435 
visceral, of larva, 65 
Nervous system, 62, 228, 433, 479 
bibliography of, 62, 433, 479 
comparative morphology of, 62 
development of, 479 
functions of, 228, 473 
morphology of, 494 
See also Neuroblast 
Neural crest, 482 
Neural disc of optic stalk, 545 
Neural surface, 8 
Neuroblast, 22, 67, 68 
cells of, 480 
changes of, in nymph, 324 
changes of, in pronymph, 491 
of adult larva, 490 
position of, in pronymph, 313 
Neuromeres, 157 
Neurospongium, 535 
Newly-hatched larva, 2 
nerves of, 65 
stomal disc of, 42 
Newport on alary nerves, 64 
on aorta, 638 
on lateral nerves, 64 
on nervous system of Myriopoda, 
477 
on trachez of Bombus, 22 
on visual organs of Céstrus larva, 
71 
Newport’s segment, 34, 35, 748. 
Metacephalic ring 
Newton on Cauliculus, 464 
on optic ganglia of Lobster, 540 
Nodes of Ranvier, 289 
Nodulus, 456, 458 
Notochrysa, hearing in, 498 
pygidium of, 629 
Notthaft on vision in Arthropods, 
557 
Nuclear division. Sze Karyokinesis 
and Direct nuclear division 
Nuclear nucleoli, 268 
threads, fibres, or skeins, 266 
Nucleolus, 268 
Nucleoplasm, 266 
Nucleus, 264 
accessory. 
active, 269 
free, 716 
histolysis of the, 308, 713 
of Graber, 613 
See 
See Paranucleus 
INDEX. 
Nucleus resting, 266 
Nussbaum on development of sexual 
ducts, 703 
Nutrient cells ot egg, 701 
Nycteribiae, 30 
Nymph, development of, 292 
bibliography, 292 
on fifth day, condition of, 330 
relations of imaginal discs in, 315 
sections, mode of preparing, 348 
tracheal ecdysis of, 339 
Nymphoid stage of embryo, 257 
OCELLUS, abnormal, in Cicindela, 
115 
compared with pineal eye, 115 
514 
development of, 514 
in nymph, 345 
lens of, 510 
morphology of, 512 
nerve to, 467, 494 
pigment cells of, 511 
preretinal membrane of, 512 
retina of, 510, 511 
structure of, 510 
Oculo-olfactory bundle, 468 
(Esophageal commissures of larva, 
491 
connectives in Orthoptera, 449 
Qésophagus of imago, 407 
of larva, 56 
of nymph, 314 
Céstrus, pharynx of larva, 46 
pronymph of, 293 
visual organs ot larva of, 71 
Oinocytes, 274, 276 
bibliography of, 276 
Oken on antenna, 589 
Olfactory bulbs. See 
ganglia 
cones, 588 
sense, 498 
Omentum of larva, 86. See Fat 
bodies 
Ommateum, 516 
compared with astronomical tele- 
scope, 562 
development of, 546 
See Compound eye 
Ongulaire, 209 
Operculum, 4 
of Hymenoptera, 179 
Antennal 
