500 



INDEX 



Morula, 162 



Mosasauria, 321, 441 



Miillerian duct, 5s, 99, IIJ , J 3°, 



149, 349 



, devpt. of, 190, 222 



Muller's organ, 8, 170 

 Multituberculata, 453 

 Muscle-buds, 277, 311 

 Mustelus, placenta of, 248 

 Myelencephalon, 41 

 Myoccel, 2, 13, 34, 166, 270 

 Myodome, 285 

 Myotome, 2, 7> *3> 35, 53, 166, 181, 



270 

 Myxine, ear of, 395 

 — , hypophysial sac of, 341 

 — , kidney of, 33, 349 

 — , pituitary of, 400 



Nasal, 68, 72, 300 



— pit, 64, 193 

 Naso-lachrymal duct, 158 

 Navicular, 93, 301 

 Neognathae, 448 

 Neopallium, 380 

 Neossoptiles, 120 

 Nephridia, 15, 33, 170, 348 

 Nephroccel, 2, 31, 271 

 Nephrotome, 2, 31, 181, 188, 220, 



271 

 Nestling down, 224 

 Nestling feathers, 119 

 Neural arch, 50, 72, 302 



— crest, 181, 208 



— fold, 163, 180, 207 



— plate, 163, 180, 206 

 Neurenteric canal, 164, 180 

 Neurocranium, 28, 49, 279 

 Neuromast organs, 39, 396 

 Neuron, 363, 373 

 Neuropore, 17, 163, 208 

 Nictitating membrane, 103 

 Nose, devpt. of, 193 



" Nose-brain," 370 



Notharctus, 460 



Nothosaurus, 440 



Notochord, 1, 16, 28, 47,49,72,302 



— , devpt. of, 164, 177, 203 



Notoryctes, 456 



Oblique septum, 125, 274 

 Obturator fissure, 124 

 Occipital arch, 279, 358, 478 



— condyle, 90, 105, 120, 135, 286 

 Oculomotor nerve, 26, 46, 354, 368, 



37o 

 Odontoid peg, 106, 140, 307 



OEstrus, 227 

 Olfactory bulb, 41 



— lobe, 370 



— nerve, 45, 366 



— pit, 8 



— tract, 75 

 Omental bursa, 143 



— cavity, 115, 274 

 Omphaloidean placenta, 231 

 Opercular, 71, 73, 300 

 Operculum, of fish, 64, 338 

 — , of tadpole, 196 

 Ophidia, 441 



Ophthalmic profundus nerve, 45, 



355 



— superficialis nerve, 46, 367 

 Ophthalmosaurus , 441 

 Opisthotic, 68, 72, 300 

 Optic chiasma, 41, 393, 472 



— cup, 22, 190 



— foramen, 137 



— lobe, 25,41, 154, 37o 



— nerve, 45 



— thalamus, 41, 154, 376 



— vesicle, 22, 190 

 Oral hood, 8 



— plate, 233 

 Orang, 462 

 Orbit, 68 



Orbital cartilage, 279 



— sinus, 58 



Orbitosphenoid, 135, 300 

 Ornithischia, 442 

 Ornithorhynchiis , 454 



— , horny teeth of, 257 



— , skull of, 294 



— , temperature of, 406 



Orthogenesis, 4S1 



Osmotic pressure regulation, 407 



Osteichthyes, 428 



Osteolepis, 428, 431 



— , fins of, 312 



— , nostrils of, 340 



— , scales of, 258 



— , skull of, 284 



Osteoscutes, 103, 258 



Ostracoderma, 427 



Otic ganglion, 387 



— process, 82, 283 

 Oviducal gland, 57 

 Oviduct : see Mullerian duct 

 Ovisac, 350 



Ovo- viviparous, 249, 352 

 Ovulation, 227 



Palaeognathee, 448 

 Palceo7iiastodon, 458 



