INDEX 



631 



Mouth parts (cont.) 



Insecta*, 383, 384, 385, 406, 407, 

 408, 409, 411, 412, 415, 417, 420, 

 423, 424, 425, 426, 427, 428, 429, 

 430, 432, 433, 436, 438, 439, 441 ; 

 of Myriapoda*, 377, 379; of Ony- 

 chophora, 282 



Mucous glands of Helix, 486 



Muggiaea, 145, 146 



Multicilia, 56 



Multiple fission of Protozoa*, 24; 

 32, 48, 59, 64, 67, 82, 83, 85, 88, 90 



Musca, 439; 440 



M. domestica, 440 



Muscle(s), Alary, 391, 391; Ad- 

 ductor, see Adductor muscles ; 

 Columella, 481; Retractor, see 

 Retractor muscles. See also Mus- 

 culature 



Muscle fibres, of Arthropoda, 280; 

 of Chaetognatha, 542 ; of Coelen- 

 terata*, 125, 131, 153; of Nema- 

 toda, 214; of Pectin, 510; of 

 Peripatus, 280; of Platyhelmin- 

 thes, 177 



Muscular gland organ, 186 



Musculature, of Actinozoa*, 159, 164, 

 165; of Arthropoda, 270; of as- 

 cidian tadpole, 597 ; of Asteroidea, 

 558, 559; of Brachiopoda, 537; 

 of Cephalopoda, 515; of Chaeto- 

 gnatha, 542; of Chaetopoda, 229, 

 232, 240; of Ciona, 592; of Cri- 

 noidea, 580; of Ctenophora, 172; 

 of Echinoidea, 566, 567, 568; of 

 Gasteropoda, 481; of gill books 

 and lungs, 445, 446 ; of Hirudinea, 

 265; of Holothuroidea, 573; of 

 Medusae, 130, 135, 154, 155; of 

 Nematoda,2i4,2i6; of Nemertea, 

 207; of Onychophora, 270, 282; 

 of Ophiuroidea, 562, 563; of 

 Polyzoa, 532; of Rotifera, 289; 

 of Thaliacea, 603 ; of the trocho- 

 sphere, 251 ; of wings, 386 



Mutations, 30 



Mutual fertilization, by Ciliophora, 

 28; by Gasteropoda, 487, 494; by 

 Oligochaeta, 254; by Platyhelmin- 

 thes, 186 



Mya, 504 



Mycetozoa, 81 ; 4, 7 



My gale, 458 



Myoblast, 177 



Myonemes, 14 



Myophrisks, 76 



Myopsida, 513 



Myrianida, 235; 231, 246 



Myriapoda, 375 ; 271 



Mysidacea, 352; 348 



ikTy^V, 353; 296, 299, 353 



M. relicta, 348 



Mytilus, 508 ; 475, 499, 500, 501, 502, 



504, 505, 505, 507, 510 

 Myxobolus, 95 ; 38 

 Myxosporidia, 95 



Nacreous layer, 472 



Naegleria, 63 ; 20, 78 



N. bistadialis, 64 ; 18 



Narcomedusae, 143; 133, 154 



Nassa, 489 



Nassellaria, see Monopylaea 



Natica, 490 



Nautiloidea, 525, 528 



Nautilus, 525; 513, 514, 523 



N. macromphaliis , 528 



Nebalia, 349; 298, 299, 303, 3" 



N. bipes, 349, 350 



Neck of Cestoda Merozoa, 199 



Neck gland, see Dorsal organ 



Neck organ (Nuchal sense organ), 



307; 298, 318, 325 

 Nectocalyces, 144 

 Needham's sac, 522 

 Nematocyst, 127 

 Nematoda, 214; 2, 121 

 Nemertea, 205; 121 

 Neomenia, 474 

 Neosporidia, 93 ; 82 

 Neotermes, 412 

 Nepa, 417 



Nephridia, 123 ; 229, 242-4, 244, 265 

 Nephridial system, 123. See also 



Nephridia 

 Nephrocytes, 390; 391 

 Nephromixia, 229 ; 242 

 Nephrops, 372; 296, 373 

 Nephrostome, 229; 242, 256 

 Nereis, 235; 231, 232, 240, 243, 248, 



249 

 Nerilla, 261 ; 262 

 Nerve cord, see Nervous system 

 Nerve net, see Nerve plexus 

 Nerve plexus, 122; of Balanoglossus, 



587; of Coelenterata, 128, 154; of 



Echinodermata, 550, 554 ; of Platy- 



helminthes, 174, 190 



