INDEX 



489 



Metencephalon, 175 

 Metridium, 396, 397 

 Micrometer, 18 

 Micron, 18 

 Microstomum, 400 

 Mictic female, 410 

 Middle ear, 202, 256 

 Millipedes, 423 

 Mimicry, 334-337 

 Miracidium, 402 

 Mitochondria, 16, 17 

 Mitosis, 19, 220, 221 

 Mnemiopsis, 398, 399 

 Moisture, 354 

 Molar teeth, 91 

 Mollusca, 432 

 Molting, 42 

 Monoecious, 153 



MONOGENEA, 400 



Monomorium, 432 

 Morphology, 2, 4 

 Mosquito, 431 

 Moths, 431 

 Motor end plate, 190 

 Motor neuron, 168 

 Mouth, frog, 254 



insect, 424 

 Mucilago, 375 

 Mucosa, 94, 101 

 Muller, H. J., 267 

 Musca, 431 

 Muscles, 75-84 



cardiac, 122 



eye, 197 



head and trunk, of frog, 75-78 



histology of, 83 



leg, of frog, 81 



plain, 95 



thigh, of frog, 78-81 

 Mustelus, 447 

 Mutation theory, 319 

 Mya, 434, 435 

 Mycetozoa, 375 

 Myelencephalon, 175 

 Myenteric plexus, 95 

 Myocyte, 387 

 Myofibril, 82, 83 

 Myoneme, 380 



Myriapoda, 423 

 Myxedema, 211 

 Myxine, 446 

 Myxobolus, 380 



N 



Nageli, Carl von, 19 

 Nails, 48 

 Nares, 29 

 Nasal bones, 57 

 Nasal cavity, 57 

 Natural affinities, 23 

 Natural selection, 313 

 Nautilus, 435 

 Navel, 163 

 Necator, 407 

 Necturus, 450 

 Nemathelminthes, 406 

 Nematoblast, 390 

 Nematocyst, 390 

 Nematoda, 406 

 Nematomorpha, 408 

 Nemertea, 404 

 Neoceratodus, 449 

 Neornithes, 454 

 Nephridia, 145 

 Nephridial tubule, 146 

 Nephridiopore, 146, 147 

 Nephrostome, 146, 147 

 Nereis, 24, 417, 418 



fertilization of, 241, 243 

 Nerves, cranial, 177-180 



spinal, 80 

 Nervous system, 165 



autonomic, 181-184 



central, 184 



diffuse, 169 



earthworm, 171-173 



flatworm, 86 



frog, 178 



functional significance of, 185 



ganglionic, 170 



integrative action of, 203 

 Nervus terminalis, 180 

 Neural arch, 60 

 Neural spine, 60 

 Neural tube, 250, 251 



