INDEX 



427 



of Chelydra, 236; of Aromochelys, 238; 

 of Chrysemys, 238; of Aspidonectes, 

 242; of alligator, 245, 246; of croco- 

 dile, 247; of lizard, 249; of flamingo, 

 296; of hornbill, 306; of birds, 323; 

 of Ornithorhynchus, 352 



Neural groove, 32, 45 * 



Neural tube, 32, 45 * 



Neurenteric canal, 47 



Neuroccel, 32, 45 * 



Nictitating membrane, of turtle, 226 



Nidicolse, 323 



Nidifugae, 323 



Nopcsa, F., 272 



Northern diver, 293 * 



Nostril, median, of myxinoid, 90 



Notochord, definition of, 31; of Am- 

 phioxus, 38, 45 *; development of, 

 45 *; of Cyclostomata, 88 



Notodanidae, 112 



Notoryctes typhlops, 355 *, 356 



NotoryctidoR, 356 



Nototrema marsupium, 200 *, 201 



NuttaJl, 304 



Nycticebus tardigradus, 380 



Nythosaurus larvatus, 334 * 



Odontocetse, 346, 400, 402 



Odontplcse (see Neornithes Odon- 



tolcse) 



Ogilvie-Grant, 299 

 Oikopleura, 59 * 



Olfactory, funnel of Amphioxus, 38 

 Olfactory lobes, of Squalus, 118 

 Olfactory nerves, of Amphioxus, 38 

 Olfactory organs, of fishes, 101; of 



Squalus, 118 

 Olms (see Proteus} 

 Operculum, 107; of Holocephali, 126; 



of Teleostomi, 127; of frog larva, 



207 



Ophidia, 255-259 

 Opisthocomi, 300 

 Opisthoglyphs, 257 

 Opisthomi, 111, 150 

 Oral, funnel of Amphioxus, 38; of 



tunicate, 50, 51 *; of lamprey, 92 

 Oral hood (see oral funnel), 48 

 Orang-utang, 382, 383 * 

 Orca gladiator, 401 * 

 Orientation of embryo in bird's egg, 



317* 



Origin, of fishes, 72-75; of Amphibia, 

 174, 175; of reptiles, 213, 214; of 

 birds, 271-276; of flight, 272-276; of 

 mammals, 332-336; of modernized 

 mammals, 344; of Man, 387 



Oriole, Baltimore, 311* 



Ornithischia, 219, 221 



Ornithopoda, 221 



Ornithorhynchidse, 345, 350-352 



Ornithorhynchus anatinus, 157; pectoral 

 girdle of, 347 *; 349 *, 350, 351, 352 



Orycteropus capensis, 375 *, 377 



Osborn, H. F., viii, 16, 17, 19, 20, 25, 

 26, 27, 29, 71, 86, 97, 98, 99, 176, 

 210, 211, 212, 274, 340, 341, 345, 346 



Ostariophysi, 111, 140 



Osteolepida, 111, 129 



Osteolepis, 156 



Osteostraci, 170, 171 



Ostrachion schlemmeri, 152 * 



Ostrachodermi, 80 *, 82, 112, 168-171 



Ostrich Dinosaur (see Struthiomimus) 



Ostriches, 283, 284 



Otariidse, 368, 369 



Otter, 367 *, 368 



Owen, R., 7 



Owls, 306; great horned, 307 *; screech, 

 306 



Oxen, 392 



Paddle-fish, 111 



Paedogenesis, 14, 22; in Larvacea, 59; 

 in Ammoccetes, 96; in fishes, 163; in 

 urodeles, 189, 194, 195 



Pair wing theory of origin of flight, 



Palseogeography in relation to evolu- 

 tion, 28 



Palceohatteria, 232 



PalcBomastodon, 396, 397 * 



Palaeospondylidse, 112 



Palingenetic character, 24 



Pallas, 33 



Pan pygmceus, 379 *, 384 



Pangolins, 377 



Papio leucophceus, 379 



Paradisea minor, 311 * 



Parapsida, 215 



Parasuchia, 216 



Parent stream theory, 138 



Parrots, 303 *, 305, 306 



Partridges, 299 



Passer domesticus, 31 1 * 



