Index 



715 



Nerve — Cont'd 

 sensory, 196, 203 

 spinal, 71, 203-204 

 sympathetic, 250 

 thoracic, 204 

 transmission, 232 

 Nervous system, 40 

 annelids, 449 

 arthropods, 488 

 autonomic, 194, 206-207 

 central, 194, 196-203 

 chordates, 560-561 

 coelenterates, 384 

 echinoderms, 543 

 Enteropneusta, 558 

 frog, 69-71 

 mollusc, 468 

 perch, 586 

 peripheral, 203-205 

 physiology, 207-211 

 planaria, 405, 406 

 Romalea, 526 

 roundworms, 425 

 shark, 579 



vertebrate, 192-224, 566 

 Nestling, 132 

 Neural arch, 57, 105 

 canal, 105 

 cavity, 106 

 plate, 287, 288 

 spine, 105, 106 

 tube, 288 

 Neurolemma, 194, 195 

 Neuromuscular system, 232 



tissue, 171 

 Neuron, 195 

 afferent, 195, 209 

 association, 195, 209 

 efferent, 195, 196, 209 

 Neuropodium, 451 

 Neuroptera, 539 

 Neurospora, 316 

 Neutron, 25, 28 

 Neutrophil, 177, 178 

 Newt (see Triturus), 596, 598 

 Niacin, 146 



Nictitating membrane, 52, 216 

 Nighthawk, 618, 625 

 Nissl's granule, 194 

 Nitrogen, 153, 155, 235 

 Noctiluca, 357 



Node, auricular-ventricular, 172 

 lymph, 178, 183 

 of Ranvier, 194, 195 

 sino-auricular, 171, 172 

 Nonstriated muscle (see smooth 



muscle), 58, 115-116, 124 

 Nose, 71, 149 



Nostrils (see nares), 52, 62-63, 120, 

 149 



Notacanthus, 590 



Notch, semilunar, 109 



Notochord, 100, 104, 282, 288, 560, 565 



Notopodium, 451 



Notostraca, 506 



Nuclear membrane, 267, 268, 270 



Nucleolus, 267, 268, 271 



Nucleoplasm, 268 



Nucleoproteins, 191 



Nucleus, atomic, 25 



cell, 36, 266, 267-268, 270 

 Nuda, 399 



Nudibranch, 471, 476 

 Nuptial pad, 53 

 Nutrition, 144-146 

 Nymphon, 489, 516 



O 



Obelia, 386, 391, 392 

 Obesity, 230, 239 

 Occipital bone, 56, 103 



complex, 102, 103 



condyle, 56, 103, 105 



lobe of cerebrum, 197, 200 

 Ocean sunfish, 581, 589, 590 

 Oceanic communities, 663-667 



province, 664, 667 

 Ocellus, 521, 522, 526 

 Octopus, 45, 92, 212, 328, 466, 468, 



480-481, 637 

 Odocoileus, 630 

 Odonata, 538 

 Odontognathae, 623 

 Odor, 149, 214, 215 



receptors, 150 

 Odoriferous gland, 82 

 Oil. 76 

 Olfactory, bulb, 196, 197 



epithelium, 213 



lobe, 69, 196. 197. 199, 202 



nerve, 196, 197, 200 



pit, 566 



tract, 69, 196, 197 

 Oligocene epoch, 333, 342 

 Oligochaeta, 449, 454-462 

 Oligoentoma. 536 

 Omasum, 132, 133 

 Omentum, 137 

 Ommatidium, 502, 503 

 Omniverous, 144 

 Onchocerca, 437 

 Onchocerciasis, 437 

 Oncorhynchus, 590 

 Oncosphere, 418 

 Onychophora, 489, 490-492 

 Oocyst, 363, 364, 365 

 Oocyte, 275 

 Ooecium, 483 

 Oogenesis, 275 



