714 



Index 



Mouth parts of insects, 527-530 



Movement, 24, 93, 114, 118 



Mucin, 138, 142 



Mucosa, 135 



Mucous gland, 54, 135 



Mucus, 81 



feeding 454, 464, 467, 483, 484, 485, 

 562, 566, 573 

 Mud minnow, 590 

 Mudpuppy {see Necturus), 596, 598, 



601 

 Mudskipping goby, 592, 593 

 Mule, 639 



Multihybrid cross, 341 

 Multiple alleles, 307 



fission, 252, 351 

 Multipolar nerve, 384 

 Muridae, 44, 636 

 Mus, 636, 637 

 Muscle, arrangement, 119 



attachment, 93, 105, 109, 110 



belly, 117 



cardiac, 58, 117, 124 



ciliary, 218 



contraction, 121 



insertion, 117 



origin, 117 



skeletal, 58, 116, 122-126, 190 



smooth, 58, 115-116, 124, 173, 189, 

 206, 234 



twitch, 122, 123, 124, 232 

 Muscular system, 40, 58-60, 114-126 

 Muskellunge, 590 

 Muskrat, 637 

 Mussel, 468, 476 

 Mustek, 630 

 Mutation, 311-312, 328 

 Myctophum, 590 

 Myelencephalon, 201 

 Myelin sheath, 194, 195, 209 

 Alvocyte, 2)76 

 Myofibrils, 115, 116, 126 

 Myoneme, 2)72> 

 Myosin, 121 

 Myotis, 630. 632 

 Myotome, 119, 564 

 Myrientomata, 536 

 Myrmecophaga, 630 

 Myrmecophile, 336 

 Mysis, 507, 508 

 Mytilus, 476 

 Myxedema, 230 

 Myxine, 567, 571, 574 

 Myxinoidea, 571 



N 



Nacre, 472 

 Nail, 83, 85, 86 

 Nais, 449, 461 

 Naja, 610 



Nares, 52, 62-63, 120, 149 

 Narrow-mouthed toad {see Gastro- 



phryne), 596, 599 

 Narwhale, 630 

 Nasal bone, 56, 102 



cavity, 104, 214 



mucosa, 214 



region, 196 



septum, 150, 205 

 Nasolacrimal duct, 216 

 Nasutes, 532 

 Natrix, 609 

 Nauplius, 508, 510 

 Nausea, 224 



Nautilus, chambered, 468, 477, 481, 482 

 Neanderthal man, 642 

 Neanthes, 449, 450-453 

 Nearsightedness, 219 

 Nebalia, 507 

 Necator, 432, 433 

 Neck, of rib, 107 



of tooth, 86 

 Necturus, 596, 598, 601 

 Nekton, 660 

 Nemathelminthes, 45, 347, 423-445 



characteristics of, 424-426 



classes, 426 

 Nematocyst, 384, 385, 387 

 Nematoda, 426 



Nematode {see Nemathelminthes) 

 Nematomorpha, 347, 438, 442-443 

 Nemertina, 347, 421-422 

 Neo-Darwinism, 328-330 

 Neognathae, 625 

 Neornithes, 617, 623-624 

 Nephridiopore, 448, 458 

 Nephridium, 448, 458 

 Nephron {see kidney tubules), 184, 



185, 186, 188, 189 

 Nephrostomy 185, 448, 458 

 Nereis {sec Neanthes), 449, 450-453 

 Neritic province, 664, 666 

 Nerve, afferent, 203 



bipolar, 384 



cell, 192, 194, 195, 199 



center, 174, 201 



cervical, 204 



cord, 192, 193, 196 



cranial, 71, 194, 204-205 



efferent, 203, 205 



excitatory, 174 



impulse, 195, 207-209 



inhibitory, 174 



mixed, 203 



multipolar, 384 



myelinated, 195 



pathway, 195 



physiology, 207, 211 



process. 198, 207 



ring, 543, 547 



