634 



ANIMAL BIOLOGY 



Mammals, origin of, 429 



viviparous, 429 

 Mammary glands, 324, 424, 459, 491, 547 

 Mammoth, 535, 538, 543 



Man, 53, 116, 437, 448, 449-4o4. 485, 502-504, 

 545-547, 568-569 



arm, 63 



life cycle, 44 



(See also Human parasites) 

 Manatees, 441 



Mandibles, 255, 258, 277, 278, 325, 425 

 Mandibulate insects, 277, 282, 294 

 Mandrils, 439 

 Manganese, 20 

 Mantids, 279, 288 



Mantle, 193, 215, 216, 317, 318, 575 

 Mantle cavity, 215, 223 

 Mantle fibers, 49 

 Manubrium, 144, 145 

 Margaropus annulatus, 307 

 Marginal canal, 144, 145 

 Marginal lappets, 146 

 Marginal spines, 196, 196 

 Marine distribution, 531 

 Marine faunas, 510, 611 

 Marmosets, 534 

 Marmots, 535 

 Marrow, 106, 326 



red, 326 



yellow, 326 

 Marsh associations, 522 

 Marsh wren, 509 

 Marsupialia, 429 



Marsupials, 429-430, 445, 534, 549 

 Marsupium, 218, 430 

 Marten, pine, 537 

 Mass, 7, 15 



conservation, 15 

 Mast, S. O., 65 

 Mast cell, 101 

 Mastax, 189 

 Mastication, 496 

 Mastigophora, 78, 79, 80, 88 

 Mating, 521 

 Matter, 7-14 



living and nonliving, 17-18 

 Maturation, egg cell. 111, 112 



germ cells, 476 

 Maturation period, 109-112 

 Maturity, 44, 460-461 

 Maxillae, 255, 277, 278, 398 

 Maxillipeds, 255, 257, 274 

 Meadow mice, 509 

 Meandrina meandrites, 154 

 Meandrina sinuosa, 154 

 Mechanical energy, 38, 39, 458 

 Mechanism. 25 

 Medicinal leech, 245, 254 

 Medicine, 6, 520, 578, 583 



Medulla, 334, 343, 346, 375-377, 387, 408, 461 

 Medullary groove, 378, 378 

 Medullary sheath, 102 

 Medullary tube, 313, 379 

 MeduUated nerve fibers, 103 

 Medusae, 144-148, 149-152 



Megalops, 269 

 Megarhyssa lunator, 296 

 Meiosis, 110, 111 

 Melanoplus femur-rubrum, 286 

 Membrane of Reissner, 337 

 Membrane bones, 325 

 Membranelles, 86 

 Membranes, 11, 12 



basement, 99, 260, 261, 465 



cell, 29, 69 



egg, 383 



nuclear, 30, 47-50 



plasma, 29, 30 



semipermeable, 12, 22, 29 



tympanic, 336, 337 



undulating, 71 



vestibular, 337 

 Membranous labyrinth, 336, 360 

 Memory, 492, 497 

 Mendel, 657, 561, 583 

 Mendelism, 557 

 Meridional canals, 166, 157 

 Meroblastic egg cells, 120, 382, 383, 445, 477 

 Merriam, C. H., 535 

 Mesencephalon, 334 

 Mesenchyme, 100, 122, 464, 469, 478 

 Mesenchyme cells, 187, 469 

 Mesenteric artery, 345, 428 

 Mesenteric vein, 428 

 Mesenteries, 146-148, 323 



Mesoderm, 122, 124, 125, 129. 130, 157, 160, 

 166, 313, 444, 419, 477-478 



formation, 477 

 Mesodermal pouches, 478 

 Mesoglea, 137, 138, 144, 466 

 Mesomere, 478 



Mesonephric duct, 323, 331, 332 

 Mesonephric tubules, 331, 332 

 Mesonephros, 323, 331, 332, 347, 357, 370, 470 

 Mesopterygium, 367 

 Mesosoma, 306 

 Mesothelium, 122, 478 

 Mesothorax, 276, 277 

 Mesozoic era, 539, 541, 543 

 Metabolic gradient, 165, 242 



water, 483 

 Metabolism, 17, 18, 22, 33-40, 42, 43, 488-494, 

 515, 516 



ameba, 65 



annelids, 251 



coelenterates, 150 



earthworm, 235 



flatworms, 170 



hydra, 140 



mollusks, 229 



mussel, 216 



Paramecium, 71 



planaria, 163 



planes of, 483 



roundworms, 180 



spiders, 304 



sponges, 133 



starfish, 199-200 

 Metacarpals, 325, 327, 404 

 Metagenesis, 108, 152-153, 177, 320 



