INDEX 



325 



N 



Nacreous or pearly layer of shell, 130 



Nares, external, 188, 236, 262 ; internal, 190, 

 238 



Nasal bone, 222, 224, 226, 262, 294, 312 ; capsule. 

 See Olfactory capsule ; process, 296 ; region 

 of skull, 294 



Naso-buccal grooves, 152, 154 



NavicTilar, 310 



Neck, 74, 78, 266, 274, 278, 280 



Nematoeyst, 28, 30 ; stinging cells of sea- 

 anemone, 34, 38 



Nematode worms, parasitic, 62 



Nephridiopore, 56, 64, 66 



Nephridium, 56, 62, 66, 68, 70, 72, 90, 102 ; 

 ciliated funnel of, 62 ; bladder of, 62, 66 ; 

 testis-lobe of, 66, 72 



Nephrops (Norway lobster, or " crayfish "), 94 

 (gills), 316 



Nephrostome, 62, 66, 70, 116, 134, 136 



Nerve cell, 30 



Nerve commissures, cerebro-pedal and cerebro- 

 pleural, 120 ; circum-oasophageal, 84, 106, 

 108 ; circum-pharyngeal, 58, 68 ; post- 

 cesophageal, 108 



Nerve connectives, cerebro-pedal, 140 ; cerebro- 

 visceral, 140 



Nerve cord, sympathetic, 230, 274 ; ventral, 58, 

 62, 66, 68, 86, 106, 108 



Nerve cords, 50, 52. See Nervous system 



Nerve ganglia, 42, 58, 68, 106, 140 ; buccal, 120 

 cerebral, 84, 140 ; cerebro-pleural, 140 

 cervical sympathetic, superior and inferior, 

 274 ; coeliac, 278 ; Gasserian ganglion, 232 : 

 parieto-splanchnic. See Visceral ; pedal, 120, 

 140; pl^iral, 120; sub-oesophageal, 84, 106 

 sub-pharyngeal, 58, 68 ; supra-cesophageal, 84 

 106, 120 ; supra-pharyngeal, 58, 68 ; sym 

 pathetic, 230, 232; thoracic, 86, 108, 278 

 vagus ganglion, 274 ; visceral, 120, 140 



Nerves, 42, 58; abducent, 180, 184; antemiary, 

 84 ; auditory,' 180, 184 ; auricular, great, 278 

 brachial, 192, 228 ; branchial, 180, 184 

 buccal, 120, 180, 182, 184 (inner and outer) 

 chorda tjrmpani, 184 ; coccygeal, 230, 232 

 cranial, 178, 180, 186, 232, 278 ; cruralis, 228, 

 230; depressor, 278 ; facial, 120,180,182 184 

 recurrent facial, 184; genital, 120; glosso 

 pharyngeal, 180, 184, 202, 234; hyoidean, 182 

 184; hyo-mandibular, 180, 182, 184; hypoglos 

 sal, 202, 228, 232, 278 ; ileo-hypogastric, 228 

 labial, 120; laryngeal, inferior or recurrent, 

 278: superior, 274; lateral, 42, 44, 180, 184 

 mandibiilar, 180, 182, 232 ; external mandi' 

 bular, 182, 184 ; internal mandibular, 184 

 maxillary, 180, 182, 232 ; oculomotor, 180. 

 182 ; of neck (rabbit), 274, 278, 280 ; olfac 

 tory, 180, 184, 226, 232 ; ophthalmic, superior 

 and inferior, 180, 182, 232; optic, 84, 120, 

 180, 182, 232 ; palatine, 180, 184 ; paUial, 120 

 pathetic, 180, 182; pedal, 120; peripheral 

 148, 228 ; peroneal, 204, 228 ; phrenic, 278 

 pneumogastric. See Vagus ; post-spiracular. 

 184; pre-spiracular, 184 ; recurrent laryngeal 

 278 ; sciatic, 204, 206, 228 ; semimembranosus 

 204, 228, 230 ; sensory and motor, 148 ; spinal, 

 228, 230, 278 ; spinal accessory, 278 ; splanch 

 nic, 278 ; sympathetic, 230, 274 ; tibial, 204, 

 228 ; trigeminal, 180, 182, 232 ; vagus or 

 pneumogastric, 180, 184, 202, 234, 274 

 visceral, 108, 180, 184 



Nervous system : Liver-fluke, 42 ; tape -worm, 50 

 earth-worm, 58 ; leech, 68 ; cockroach, 84 

 crayfish, 106; snail, 120, 122; mussel, 140 

 AmpUoxus, 148; dogfish, 176; frog, 202 

 206, 226-234; Xenopus, 202, 206, 226-234 

 pigeon, 264 ; rabbit, 274, 278, 280, 282 



Nervous system, peripheral, 148, 228"; sym- 

 pathetic, 230, 232, 274 



Neural arch, 154, 220, 302. See Vertebra 



Neural canal, 300. See Vertebra 



Neural spine, 220, 300, 302. See Vertebra 



Nictitating membrane., 188, 236, 266 



Nose. See Olfactory organ 



Nostrils, 152, 154, 188, 236, 266 



Notochord, 144, 146, 148, 154, 316 



Nucleus, 2, 8 (macro- and micro-nucleus), 12, 16, 

 28, 30 



O 



Occipital condyle. See Condyle. Occipital 

 segment, 292 



Odontoid process, 260, 300 



Odontophore, 118, 124, 316 



(Esophageal pouches or calciferous glands, 56 



CEsophagus or gullet, 8, 34, 36, 40, 56, 66, 82, 

 104, 118, 138, 190, 238, 242, 268, 316 



Oil or preen gland, 238 



Olecranon process, 252, 306 ; fossa, 306 



Olfactory capsules, 176, 292, 294 



Olfactory lobes, 176, 226, 264 ; nerves. See 

 Nerves; organ, 180; pit, 148 



Omentum, 240, 270 



Omosternum, 194 



Opisthocoelous. See Vertebra 



Opisthonephros, 162 



Optic lobes, 178, 228, 264; nerve. See Nerves ; 

 thalami, 176, 228 



Oral groove (peristome), 8 ; cone (hypostome), 

 28 ; hood, 142, 144 



Orbit, 260, 262, 312 



Orbital process, 296 



Orbito-sphenoid, 224, 226, 294 



Organ of Bojanus, 134 



Oscarella, 24, 316 



Os eentrale, 308 



Osculum, 14, 18, 20 



Os innominatum, 256, 308 



Os magnum, 308 



Ossicles, 106 ; auditory, 296 



Ostia, 20, 24, 104, 132 



Ostium, 36, 38 



Otocyst. See Auditory organ 



Otoliths, 186 



Ova or eggs, 48, 52, 62, 162, 218,.250 



Ovary : Hydra, 28 ; liver-fluke, 40, 44 ; tape- 

 worm, 48, 52 ; earth-worm, 58, 62 ; leech, 68 ; 

 crayfish, 104, 106 ; mussel, 138 ; Amphioxus, 

 146; dogfish, 162; frog, 216, 218; Xenopus, 

 216, 218 ; pigeon, 242, 248, 250 ; rabbit, 290 



Oviduct, 40, 48, 52, 58, 68, 104, 106, 120, 162, 

 218, 242, 290 



Ovisacs, 218 



Ovo-testis or hermaphrodite gland, 120 



Paddle, swimming, 98 

 Palatal process, 296 

 Palate, 262, 296 

 Palatine bone, 226, 262, 296 



