520 



INDEX 



Nerve(s), cranial, 

 111,437 



IV, 437 



V, 439 



VI, 449, 452 



VII, 461 



VIII, 449, 452 



IX, 461 

 XII, 461 



Nerve fibre(s), 



absence of in primary pineal diverticu- 

 lum, 245 



afferent, 407 



of central nervous system, 407 



decussating, 409 



efferent, 407 



homolateral, 409 



myelinated, 406, 464 



of optic nerve of inverted eyes, 15 



of optic nerve of upright eyes, 14 



in pineal stalk of Amir a, 231 



of pineal tract, 191 



from sensory cells in pineal stalk, 211 



of sympathetic system, 407 



unmyelinated, 406, 431 

 Nerve-fibre layer 



of pineal sac, 249 



of retina, 15, 149, 54, 166, 255 

 Nerve 



ganglia of pineal system of reptiles, 245 



ganglion of Salpa, 176 

 Nerves of pineal system of reptiles, 245, 



247, 258 

 Nervous system, coexistence of vertebrate 

 and invertebrate types of, in Entero- 

 pneusta, 177 

 Nervus conari (Kolmer), 410 

 Nervus 



oculi parietalis, 134, 194, 228, 231, 243, 

 244, 247, 259, 260, 261, 264 



organum parietalis (Nervus oculi pine- 

 alis), 188, 192, 194, 228, 231, 243, 

 244, 259, 260, 261 



parietalis. See N. oculi parietalis 

 Nervus pinealis, 7, 185, 188, 194, 228, 231 ; 

 see also N. parietalis 



absence of, 233 



degeneration of, 233 



development of, 243 



disappearance during ontogeny, 223, 233 



relations of, 244, 260, 261 



of Sphenodon, 259, 260, 261 

 Nervus saccus pinealis, 232, 246, 262, 263, 



264 

 Neural 



ectoderm, 10 



plate of R. palustris, 11, 52 

 Neuroblasts, 322, 382 

 Neurone 



motor, 17 



sensory, 17, 191, 249, 255 

 Neuropil, 113 

 Neuropore, 



anterior, 5 



of higher arachmids (Patten), 378 

 Neuroptera, 362 



Neuro-sensory cells, of ependyma, 178 



Newts, 224 



Nissl granules, 407 



Notochord, 341, 475 



Nothosaurus mirabilis, 268 



Novocain, 441 



Noyau parietal, 246 



Nuclear zone, 304 



Nucleus 



interstitialis, 418 



tecto-bulbar, 420 



tecto-spinal, 420 

 Nyctiphanes, norwegica, 23, 24 

 Nystagmus, 438, 449, 452, 453, 461 



Ocellus(i), 10, 53 



of apical plate, 88, 170, 172 



of Aurelia aurita, 81 



cerebral connections in honey-bee, 122 



of fossil ant, 342 



of fossil bee, 342 



frontal, 14, 343, 345 



fusion of, 366 



of Harpes ungula, 137 



larval, 117, 362 



lateral with non-faceted cornea, 116 



median, of insects, 116 



median, of Peripatus, 114 



paired, in larva; of Yungia, 84 



of Porthetis spinosus, 343 



sensitivity to light, 81 



simple, 117 

 Octopoda, development of eyes of, 50 

 Octopus, 147, 164 

 Ocular muscles, of Hydrachnids, 129 



plates, of sea urchins, 94 

 Oculo-motor nuclei, 437 

 (Esophageal ganglia, 



inferior, 82 



superior, 82 

 Oesophagus, of Sepiolia, 164 

 Ogle, C, 59, 62 

 Oikopleura, 177 



Olfactory aperture of Ammoccetes, 191 

 Olfactory system, 417 

 Oligodendrocytes, 384 

 Oligodendroglia, 381, 384 

 Olm, 238 

 Ommatidia, 



of Area, 58, 356 



in visual area of Trilobites, 137 

 Ommatidium, 26 



transmission of rays of light, 111, 121, 122 

 Onchydhim (Oucidium), 20, 54, 477 

 Onycophora, eyes of, 112 

 Ophelia cluthensts, absence of right member 



of posterior pair of ocelli, 100 

 Ophidia, pineal system of, 284 

 Ophidhun barbatum, length of pineal 



pedicle of, 210, 217, 219 

 Optic 



chiasma, 12 



crest, 13 



cup, inversion of, 375 



cushions, of star fish, 93, 94 



