490 



GENERAL ZOOLOGY 



Neurenteric canal, 251 

 Neuromuscular spindle, 188, 190 

 Newport, G., 19 

 Nictitating membrane, 28 

 Nitrogen equilibrium, 116 

 Noctiluca, 368 



NoNCALCAREA, 388 



Notochord, 62, 63, 249, 252, 440 

 Nuclearia, 374 

 Nucleolus, 17 

 Nuda, 399 

 Nutrition, 368 



O 



Obelia, 393, 395 



Obliquus externus muscle, 76 



Obliquus internus muscle, 76 



Occipital condyle, 56 



Octopus, 435 



Oculomotor nerve, 177 



Odd chromosome, 232 



Odonata, 429 



Odontoblast, 90 



Oenothera lamarckiana, 319, 320 



Oikopleura, 442 



Oil gland, 47 



Olecranon, 69 



Olfactory epithelium, 191 



Olfactory nerve, 177 



Oligochaeta, 418 



Oligotrichida, 383 



Omasum, 98 



Ommatidium, 192 



Omosternum, 67 



Onchorhynchus, 449 



Ontogeny, 237 



Onychophora, 423 



Oocyte, 227, 228 



Oogenesis, 226 



Opalina, 381 



Ophiura, 438, 439 



Ophiuroidea, 439 



Opossum, 339, 357 



Optic cup, 257 



Optic nerve, 177 



Optic vesicle, 257 



Oral cavity, frog, 29 



mammal, 88 

 Oral glands, frog, 93 



mammal, 93 



man, 94 

 Organismal theory, 21 

 Ornithorhynchus, 454 

 Os innominatum, 68 

 Osphradium, 435 

 Ostrea, 434 

 Orthoptera, 429 

 Orthosympathetic nervous system, 



183 

 Otic pit, 256 

 Otoconia, 200 

 Otter, 334 

 Ovary, 39, 155 

 Overproduction, 313 

 Oviduct, earthworm, 158 



frog, 160 



man, 238 

 Oviparous, 154 

 Ovipositor, 330 

 Ovotestis, 153 

 Ovum, frog, 160 



Hydra, 155 



man, 238 

 Oxygen, 139 

 Oxyhemoglobin, 139 



Pacinian corpuscle, 188, 189 

 Paedogenesis, 421 

 Pain receptors, 187 

 Paired appendages, 68, 255 

 Palaemonetes, 422 

 Palatine, 57 

 Paleontology, 3, 301 

 Pancreas, 33, 103, 104, 215 

 Pancreatic secretin, 113 

 Papanicolaou, G. N., 267 

 Papilio, 431 

 Papirius, 428 

 Paracasein, 112 

 Parallel induction, 267 

 Paramecium, 381, 383 

 Parapodium, 417 



