720 



INDEX 



Metathcria, 642. 



Metathorax, 314. 



Metazoa, 24, 25, 73-91. 



Metridium, 134, 135, 136, 141. 



Mice, 658, 660, 698. 



Micracidium, 159. 



Microcentrum, 344. 



Microdrili, 236. 



Micromere, 507, 508. 



Micronodon, 685. 



MicropodidoE, 591, 613. 



Micro pterus, 467. 



Microsauria, 525, 526. 



Microstoma, 156. 



Micrura, 177. 



Midas, 663. 



Midges, 357. 



Migration, of birds, 622 ; of mammals, 683. 



Millepora, 129. 



Millipedes, 309-310. 



Mimida, 591 ; Mimus, 615. 



Mink, 655. 



Minnows, 443, 456. 



Miocene period, 697. 



Mites, 381. 



Mitosis, 14, 15, 16. 



Mniotiltidcz, 593. 



Moa, 589, 597. 



Modiola, 262. 



Molar, 636, 679. 



Moles, 642, 649, 650. 



Molgula, 393. 



Molluscoidea, 183. 



Molossidce, 651. 



Molting, 288, 324, 578. 



Mollusca, 24, 25, 242-273 ; classification, 

 243, 272; metabolism, 270; mor- 

 phology, 269; reproduction, 271. 



Monaxonida, 105. 



Monitors, 537. 



Monkeys, 644, 662, 663, 664, 696. 



Monocystis, 48, 49, 50. 



Monodelphia, 632, 642. 



Monodon, 675. 



Monoecious, 80. 



Monogamous, 653. 



Monogenea, 161. 



Monopeltis, 538. 



Mono ps, 156. 



Monoscelis, 156. 



Monosiga, 47. 



Monostomum, 162. 



Monotremata, 642, 645-676, 694, 695, 696. 



Moose, 644, 669. 



Mordacia, 420. 



Morphology, 26. 



Mosquitoes, 50, 356, 357, 371. 



Motacillidce, 591. 



Moths, 328, 337, 338, 352-356. 



Motmot, 610. 



Mouse, 643. 



Mouth, 53 (see digestive system). 



Mouth parts of insects, 313, 331. 



Mucosa, 481. 



Mud-puppy, 477, 510, 513. 



Mugiliformes, 444. 



Mullet, 444. 



M idtituberculata, 685. 



Mungoose, 653. > 



Muridce, 658, 660. 



Murre, 609. 



Mus, 643, 660. 



Musca, 358; Muscida, 358. 



Muscular system, 78; of Ascaris, 172; 



crayfish, 287 ; frog, 497, 498-501 ; 



lamprey, 416, 417; liver fluke, 157; 



Metridium, 135, 136; perch, 437; 



pigeon, 582; Planaria, 153; starfish, 



192; vertebrates, 405. 

 Muscular tissue, 74, 75. 

 Muskallunge, 462. 

 Musk-ox, 669, 670, 671. 

 Muskrat, 660. 

 Mussel, 243. 

 Mustang, 701. 

 Mustdida, 652, 655, 688. 

 Mustclis, 431. 

 M Htabilia, 511, 514-517. 

 My a, 262. 

 Myodes, 660. 

 My otis, 643, 651. 

 Myotome, 394, 416, 417. 

 Myriapoda, 275, 308-311 

 Myrmecobiidce, 649. 

 Myrmecocystus, 369. 

 Myrmecophaga, 643, 66 1 ; Myrmecopha- 



gidce, 66 1. 

 Mysidacea, 294. 

 Mysis, 294, 296, 304. 

 Mystacoceti, 645, 675-676. 

 Mytilus, 262. 

 Myxine, 414, 420; Myxinidce, 420; 



Myxinoidea, 420. 

 Myxosporidia, 52. 



