390 



INDEX 



Neopallium, 288 

 Nephridia, 250 

 Nephrotome, 175, 251 

 Nerve cells, 275 

 Nerve tissues, 104 

 Nerve tracts, 281 

 Nervous system 



Brain, 285 



Development, 271 



Sympathetic, 282 

 Neural groove, 271 



Amphioxus, 22 



Frog, 53 



Reptile, 66 

 Neurocoel, 274 

 Neurone, 275 

 Notochord, Def., 4 



Oculomotor nerve, 296 

 Olfactory nerve, 295 

 Olfactory organs, 302, 304 

 Omentum, 197 

 Operculum, 133, 208 

 Ophidia, 63 

 Opossum skull, 131 

 Optic capsule, 126, 127, 306 

 Optic chiasma, 296, 308 

 Optic lobes, 291 

 Optic nerve, 295 

 Optic vesicle, 305 

 Organ formation, 105 

 Organizators, 314 

 Origin of vertebrates, 340 

 Ornithorhynchus, 77, 78 

 Osteoblasts, 172 

 Osteoclasts, 172 

 Ostracodermi, 30, 32 

 Ostrich, 72 

 Ovary, 260, 319 

 Oviparous, 37, 61 

 Ovo-viviparous, 37, 61, 260 

 Owen, 299 



Paedogenesis, 52 

 Palaeospondylus, 30, 148, 337 

 Pallium, 288 

 Pancreas, 194, 318 

 Parapsida, 60 



Parathyroid glands, 207, 317 

 Parietal eye, 290 

 Pectoral girdle, 158 

 Pelvic girdle, 163, 164 



Penis, 262, 264 

 Perameles, 95 

 Pericardium, 229 

 Periosteum, 172 

 Perissodactj'la, 89 

 Peritoneum, 195 

 Petrifaction, 333 

 Petromyzon, 31, 32 

 Pharynx, structure, 198 

 Pia mater, 274 

 Pigment, 115 

 Piltdown man, 353 



Pineal gland, 291, 316 



Pithecanthropus, 137, 352 



Pituitary gland, 139, 291, 316 



Placenta, 80, 93 



Placentals, embryology, 80, 92 



Plantigrade, 169 



Polypterus, 44 



Porpoise, 90 



Primates, 81 



Primitive, Def., 6 



Proboscidea, 89 



Pronephros, 251 



Prototheria, 76 



Pterodactyl, wing, 170 



Pterygo-quadrate, 128 



Pyloric sphincter, 201 



Ramus communicans, 283 

 Ratites, 72 



Rattlesnake, 62, 63, 122 

 Rays, 37, 38 

 Receptors, 300 

 Rectum, 202 

 Renal portal vein, 240 

 Replacement bone, 110 

 Reptiles 



Age of, 347 



Embrj-ology, 64 



Evolution, 346 

 Reptilia, 56 

 Respiration, Def., 205 

 Retina, 306, 307 

 Rhinoceros, 89, 122 

 Rhynchocephalia, 60 

 Ribs, 154 

 Rodentia, 85 



Sacculus, 310 

 Salivary glands, 199 

 Sauripterus, 159, 345 



