TNDEX 



"£oJ 



Nervous system — 



of medusae; 178, > 186. 



of Nematoda, 300. 



of pigeon, 417. 

 ' of rabbit, 453. 



of skate, 378. 



of swan mussel, 322. 



of tapeworm, 209. 



physiology of, 76. 

 Nervures, 275. 

 Neurilemma, 94. 

 Neuropore, 480. 

 Neuropfera, 286, 515. 

 Newts, 383, 384. 

 Nodes of Ranvder, 94. 

 Notochord, 339. 



of AmpMoxus,'i$o, 480. 



of dogfish, 344. 



of tadpole, 344, 491. 

 Notopodium, 233. 

 Notum, 274. 

 Nucleoplasm, 83. 

 Nucleus, -83. 



Nutrition, holozoic, holophytic, 

 saprophytic, 168. 



in plants, 167, 531, ',533, 536. 

 See also Food. 

 Nymph, 285. 



of Acarina, 269. 



of insects, 285. 



Obelia geniculata, 174,' J75> Y]6. 



medusa of, 176, 177. 

 Obturator foramen, 39. 



of pigeon, 408. 



of rabbit, 434. 

 (Esophagus, 47. See also Gullet. 



of Amphioxus, 335. 



of cockroach, 277. 



of crayfish, 249. 



of dogfish, 353. 



of earthworm,'22i. 



of frog, 47. 



of pigeon, 410. 



of rabbit, 441. 



of swan mussel, ^317. 

 Offspring,- 8. 



Olfactory organs, ' of cockroach, 

 280. 



of crayfish, 264. 



of dogfish, 371. 



Olfactory organs — 



of frog, 82. 



of pigeon, 417. 



of rabbit, 458. 



of swan mussel, 323. 

 Oligochseta, 515. 



Omentum, hepatic; of dogfish, 354. 

 Ommatidia, 261. 

 Omosternum, 37. 

 Onchosphere, 211. 

 Oocytes, 106. 



of Hydra,lJo. 

 Oogenesis, 106. 

 Oosperm, 109. 

 Open circulatory system,257. 



of tadpole, 493. 



of Teleostomi, 380. 

 Operculum, 



of tadpole, 493, 494. 



of Teleostomi, 380. , 

 Ophidia, 392, 519. 

 Order, 513. 

 Organisation, 18. 

 Organised things, 547. 

 Organism, 18. 

 Organs, 1 18. 



Ornithorhynchus, 457, 45S. 

 Orthoptera, 286, 515. 

 Osphradium, 323. 

 Ossicles, auditory, 430. 



brachial, 577, 578. 



cardiac, prepyloric, pterocar- 

 diac, .pyloric, ilrocardiac, 

 and zygocardiac, 251. 

 Ostia, of cockroach, 278. 



of crayfish, 253. 

 Ovaries, 65. 



of Ascaris, 299. 



of cockroach, 280. 



of crayfish, 264. 



of earthworm, 227, 228. 



of frog, 65. 



of Hydra, I Jo. 



of leech, -238. 



of liver fluke, 2Q4. 



of lizard, 579, 580. 



of rabbit, 447. 



of whiting, 382. 

 Ovary, of pigeon, 414. 



of dogfish, 356. 

 Oviducts, of Ascaris, '299. 



