Mermis, 268 

 Meroblastic, 142 

 Merogamy, 137 

 ]\Ieropodite, 97 

 Merozoites, 186 

 Meryhippus, 569 

 Mesectoderm, 202 

 Mesencephalon, 468 

 Mesenchyme, 74, 147 

 Mesenterial filaments, 226 

 Mesenteries, 99, 480 

 Mesenteron, 94 

 Mesethmoid, 458 

 Mesoblast, 147 

 Mesoderm, 94, 146 

 Mesoglcea, 208 

 Mesohippus, 569 

 Mesonemertini, 258 

 Mesonephros, 106, 487 

 Mesonotum, 404 

 Mesopleuron, 404 

 Mesopterygium, 464 

 Mesorchium, 480 

 Mesosternum, 404 

 Mesothelium, 147 

 Mesothorax, 404 

 Mesotroche, 273 

 Mesovarium, 480 

 Metabola, 191 

 Metacarpals, 465 

 Metagenesis, 131 

 Metamere, 126, 269 

 Metamerism, 126 

 Metamorphosis, 150, 414 

 Metanemertini, 258 

 Metanephros, 488 

 Metanotum, 404 

 Metapleuron, 404 

 Metapodium, 325, 53:5 

 Metapterygium, 464 

 Metasternum, 404 

 Metastoma, 377 

 Metatarsals, 465 

 Metathorax, 404 

 Metuzoa, 201 

 Metencephalon, 468 

 Methona, 39 

 Metridium, 231 

 Miastor, 414, 430 

 Mice, 566 

 Microcentrum, 421 

 Microchiroptera, 565 

 Microconodon, 559 

 Microcotyle, 244 

 Microdrili, 279 



INDEX 



Microgametes, 169 

 Microlepidoptera, 432 

 Microlestes, 559 

 Micronucleus, 192 

 Micropylar apparatus, 134, 



A T > 



Microthelyphonidse, 393 

 MiiTiira, 258 

 Midas, 574 

 Midbrain, 468 

 Mid-gut, 94 



Miescher's corpuscles, igi 

 Migration theory, 45 

 Miliola, 179, 180 

 Milk glands, 546 



teet h, 553 



Millepora, 211, 217 

 Mimicry, 37 

 Mink, 565 

 Miohippus, 569 

 Miracidium, 246 

 Mites, 396 

 Mitochondria, ^8 

 Mitosis, 60 

 Mitrocoma, 214 

 Mixipterygium, 505 

 Mnemiopsis, 235 

 Moccasin, 531 

 Mole cricket, 421 

 Moles, 564 

 Molgula, 446 

 Molpadia, 308 

 Molting, 350 

 Mollusca, 310 

 Molluscoida, 166 

 Monactinellidse, 205 

 Monascidia;, 445 

 Monaster, 60 

 Monaxial symmetry, 123 

 Monera, 172 

 Monezia, 248 

 Monitor, 530 

 Monkeys, 573 

 Monocaulis, 217 

 Monocystis, 187 

 Monodelphia, 561 

 Monodon, 572 

 Monogenea, 244 

 Monogony, 128 

 Monohybrid, 140 

 Monomyaria, 323 

 Monophyodont, 553 

 Monopneumonia, 513 

 Monops, 242 

 Monoscelis, 242 



595 



Monospermy, 134 

 Monothalamia, ijcj 

 Monotocardia, 333 

 Monotremata, 55S 

 Moose, 569 



Morphological limits, 50 

 Morphology, animal. 50 

 Mosaic theory of vision, 



357 



Mosasaurus, 530 

 Moschidas, 569 

 Mosquito, 430 

 Mother-of-pearl, 319 

 Moths, 432 

 Motor roots, 468 

 Mud crab, 382 

 Mudpuppy, 520 

 M tiller's duct, 487 

 Multicellularity, 62 

 Multinuclearity, 62 

 Multipolar cells, 84 

 Multituberculata, 559 

 Murex, 327 

 Muricidas, 334 

 Mus, 566 

 Muscarias, 431 

 Muscidas, 431 

 Muscle corpuscles, So 



cross-striated, Si 



epaxial, 454 



fibres, 80 



fibrils, 63, So 



hypaxial, 454 



smooth, 8 1 



visceral, 472 



of vertebrates, 466 

 Muscular tissue, So 

 Mushroom coral, 232 

 Musk deer, 569 

 Musk ox, 569 

 Musk rat, 566 

 Mussels, 323, 324 

 Mustela, 565 

 Mustelus, 506 

 Mutations, 43 

 Mya, 324 

 Mycetozoa, 180 

 Myelencephalon, 469 

 Mygale, 396 

 Mygnimia, 40 

 Mylodon, 563 

 Myocoele, 466 

 Myomeric, 460 

 Myomorpha, 566 

 Myopsidae, 347 



