510 INDEX. 



Nerve-cord, see Nervous system 

 Nerve-ganglion buccal : Snail, 134 



cerebral: Mussel, 107 ; Snail, 134; Cockroach, 182 



cervical : Rabbit, 376 



coeliac : Babbit, 345 



frontal : Cockroach, 183 



mesenteric : Rabbit, 345 



optic : Crayfish, 164 



parieto-splanchnic, see Visceral 



pedal : Mussel, 107 ; Snail, 135 



post-cesophageal : Crayfish, 162 ; Cockroach, 182 



pre-cesophageal : Crayfish, 161 ; Cockroach, 182 



sub-cesopbageal : Leech, 59 ; Snail, 134 ; Cockroach, 182 



supra-cesophageal : Leech, 59 ; Earthworm, 83 ; Snai7, 134 ; Cockroach, 182 



sympathetic : #a&&, 345, 349, 376 



visceral : Mussel, 108, 116 



viscero-pleural : Snail, 135 

 Nerve-roots, cranial : Dog-fish, 274-282 ; Rabbit, 390, 391 



spinal : Amphioxus, 199, 200, 206, 208 ; Dog-fish, 286 ; Rabbit, 377 

 Nervous system : Hydra, 24, 28 ; Liver-fluke, 40 ; Leecft, 58, 65 ; Earthworm, 83, 88 ; 

 Mussel, 107 ; Snat7, 134 ; Crayfish, 163 ; Cockroach, 181-183 ; Amphi- 

 oxus, 198, 206, 208 ; Dog-fish, 271 ; Rabbit, 373, 380, 388 ; Pigeon, 457 

 Neural arch : Dog-fish, 224 ; see also Vertebra 

 Neural canal : see Vertebra 

 Neural plate : Dog-fish, 224 

 Neural process : Dog-fish, 224 

 Neural spine : Dog-fish, 225 ; see also Vertebra 

 Nictitating membrane : Rabbit, 337 ; Pigeon, 430, 464, 465 

 Nose, see Olfactory organ 



Nostril : Dog-fish, 220 ; Rabbit, 336 ; Pigeon, 433 



Notochord : Amphioxus, 190, 203, 206, 207 ; Dog-fish, 222, 223, 233 ; Chick, 474 

 Nucleus : Amoeba, 3 ; Paramecium, 6 ; Opalina, 8 ; Vorticella, 11 ; Monocystis, 15 ; 

 Trypanosoma, 17 ; Snail-shell, 120 



OBELIA, 30-33 



Oblique septum : Pigeon, 439 



Occipital condyle : Dog-fish, 233 ; Rabbit, 306 ; -FVwf, 411 

 Occipital segment : Rabbit, 304 

 Odontoid process : Rabbit, 297 ; Fowl, 405 

 Odontophore : Snail, 129, 136 

 Oesophageal pouches : Earthworm, 72 



CEsophagus : Liver-fluke, 37 ; ieec/i, 51 ; Earthworm, 70 ; Mussel, 109 ; Sram, 129 ; Cray- 

 fish, 160 ; Cockroach, 179 ; Dog-fish, 242 ; iJa&&&, 349 ; Pigeon, 440 

 Olecranon process : Rabbit, 326 ; -Fowtf, 423 

 Olfactory capsule : Dog-fish, 227 ; Rabbit, 310 , .FcwZ, 415 

 Olfactory lobe: Dog-fish, 273 ; iia&&&, 386, 388 ; Pigeon, 458 

 Olfactory organ : Crayfish, 167 ; Amphioxus, 201 ; Dog-fish, 286 

 Omentum : Rabbit, 342' ; Pigeon, 439 

 Opalina, 7, 8 

 Opisthotic : tfafc&ft, 311 



Optic chiasma : Z)o^ /Zsft, 283 ; Rabbit, 392, 393 ; Pigeon, 458 

 Optic foramen : Dog-fish, 229 ; jKo&fttY, 318 ; Fowl, 414 

 Optic lobe : Dog-fish, 274, 285 ; Rabbit, 390, 404 ; Pigeon, 458 

 Optic thalamus: Rabbit, 395 

 Optic tract : i?a&&tf, 388, 395 

 Oral groove : Paramecium, 6 

 Orbit : Dog-fish, 229-231, 274 ; Fowl, 414 

 Orbito-sphenoid : Rabbit, 307 ; Fowl, 414 

 Os innominatum : Rabbit, 330 ; Fowl, 425 

 Os orbiculare : Rabbit, 314 



Ossicle, auditory : Rabbit, 313 Fowl, 413, 425 ; Pigeon, 462 

 Ossicles of stomach ; Crayfish, 161 

 Otocyst : Mussel, 109 ; -Sraat'Z, 135 

 Ovarian duct : Liver-fluke, 39 

 Ovary : Hydra, 26, 27 ; Liver-fluke, 39 ; Z?cA, 58 ; Earthworm, 78, 82 ;" Mussel, 110; 



Crayfish, 159; Cockroach, 184; Amphioxus, 201, 203, 204, 214 ;j Dog-fish, 



241, 263; iJo6&ft,.369 ; Pigeon, 456 

 Oviduct: Liver-fluke, 40 ; Zeecft, 58 ; Earthworm, 77 ; Snatf, 133 ; Crayfish, 159 ; CocZ;- 

 roacft, 185 ; Dog-fish, 263 ; iZa&fcft, 369 ; Pigeon, 456 



