430 



INDEX. 



Mesogloea, 126, 162 

 Mesonephros, 18 

 Mesothorax, 77, 237 

 Mesozoic age, 414 

 Metacarpals, 297 

 Metacarpus, 38 

 Metameres, 67, 183, 215 

 Metamorphosis, 24, 408 

 Metatarsals, 297 

 Metathorax, 77, 237 

 Metazoa, 154 

 Metencephalon, 299 

 Metridium, 120, 173 

 Mice, 375 

 Microstomum, 179 

 Midbrain, 299 

 Milk dentition, 367 

 Milkweed-butterfly, 266 

 Mink, 388 

 Minnows, 328 

 Miocene period, 414 

 Mites, 234 

 Moccasin, 347 

 Mola, 334 

 Molars, 367 

 Moles, 376 

 Molgula, 289 

 Mollusca, 193 

 Molluscoidea, 189 

 Monkeys, 390 

 Monotocardia, 200 

 Monotremata, 369 

 Morphology, 403 

 Mosquitos, 269 

 Mother of pearl, 206 

 Moths, 261 

 Motor nerves, 298 

 Mourning-cloak, 266 

 Mouth-parts of Crustacea, 219 

 Mouth-parts of insects, 79 

 Mouth-parts of lobster, 68 

 Miiller's fluid, 8 

 Musca, 269 

 Muscle-plates, 17, 25 

 Muscle-plates of frog, 33 

 Muskalonge, 328 

 Muskrat, 376 

 Musk-ox, 387 

 Mussels, 206 



Mya, 207 



Myelencephalon, 299 

 Mylodon, 373 

 Myotomes, 17, 25, 33 

 Myriapoda, 236 

 Myrmeleon, 249 

 Mytilus, 206 



Naked molluscs, 200 



Nanda, 356 



Narwal, 379 



Nasal bones, 38 



Natatores, 358 



Nauplius, 221 



Nautilus, 209, 210 



Nearctic region, 409, 411 



Nebalia, 225 



Nemathelminthes, 182 



Neotropical region, 409, 410 



Nephridium, 95, 184, 220, 314 



Nephrostome, 185 



Neptunus, 228 



Nereis, 185 



Nettle-cells, 124, 162 



Neural arch, 20, 291 



Neural process, 27 



Neural spine, 27 



Neuroptera, 248 



Newts, 340 



Nictitating membrane, 44, 48, 



303 



Nidamental gland, 104 

 Notochord, 19, 42, 286, 290 

 Notochordal sheath, 19 

 Nototrema, 341 

 Nudibranchs, 200 

 Nucleolus, 126 

 Nucleus, 126, 133, 140 

 Nutria, 375 



Occipital condyle, 38 

 Ocelli, 79, 217 

 Octocoralla, 172 

 Octopoda, 211 

 Octopus, 212 

 Ocular plates, 116 

 Oculomotor nerve, 300 

 Odonata, 247 

 Odontophore, 136, 195 



