INDEX 



427 



of Chelydra, 236; of Aromochdys, 238; 

 of Chrysemys, 238; of Aspidonectes, 

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

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

 296; of hombill, 306; of birds, 323; 

 of Omiihorhynchus, 352 



Neural groove, 32, 45 * 



Neuraltube, 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- 

 phiojois, 38, 45 *; development of, 

 45 *; of Cyclostomata, 88 



Notodanidae, 112 



Notoryctes typhlops, 355 *, 356 



NotoryclidcB, 356 



Nototrema marsupium, 200 *, 201 



Nuttall, 304 



Nyclicebus tardigradus, 380 



Nythosaurus larvalus, 334 * 



Odontoceta;, 346, 400, 402 



Odontolcse (see Neornithes Odon- 



tolcae) 

 Ogilvie-Grant, 299 

 Oikopleura, 59 * 



Olfactory, funnel of Amphioxus, 38 

 Olfactory lobes, of Squalus, 118 

 Olfactory nerves, of Amphioxus, 38 

 OKactory organs, of fishes, 101; of 



Squalus, 118 

 Obns (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 * 

 Oreo 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 



Ornithorhynohidse, 345, 350-352 



Ornithorhynchus anatinus, 157; pectoral 

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



Orycteropus capensis, 375 *, 377 



Osbom, 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 



Osieolepis, 156 



Osteostraci, 170, 171 



Ostrachion schlemmeri, 152 * 



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



Ostrich Dinosaur (see Struthiomimus) 



Ostriches, 283, 284 



Otariida;, 368, 369 



Otter, 367 *, 368 



Owen, R., 7 



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

 306 



Oxen, 392 



Paddle-fish, 111 



Psedogenesis, 14, 22; in Larvacea, 59; 

 in Ammocoetes, 96; in fishes, 163; in 

 urodeles, 189, 194, 195 



Pair wing theory of origin of flight, 273 



Palseogeography in relation to evolu- 

 tion, 28 



Palceohatteria, 232 



Pal(Bomaslodon, 396, 397 * 



PalBBOspondylidae, 112 



Palingenetic character, 24 



Pallas, 33 



Pan pygmceus, 379 *, 384 



Pangolins, 377 



Papio leucophceus, 379 



Paradisea minor, 311 * 



Parapsida, 215 



Parasuohia, 216 



Parent stream theory, 138 



Parrots, 303 *, 305, 306 



Partridges, 299 



Passer domesticus, 311 * 



