INDEX 



697 



mother-of-pearl, 484, 485 

 motor-unit, 384 

 moult — 

 crustaceans, 641 



accelerating hormone, 644 



inhibiting hormone, 644 

 Mucronalia variabilis, 596 

 mucus, 256, 270 

 mucus-traps, 207, 224 

 Mugil, 236 . 

 M. cephalus, 153 

 mullet, 236 



See Mugil, Mulloides, Mullus 

 Mulloides, 236, 256 

 Mullus, 506 

 M. barbatus, 510 

 M. surmuletus, 510 

 Munida, 423 



Murex, 100, 308, 311, 351, 443, 481, 664 

 M. brandaris, 152 

 murre, 186 



See also Uria, guillemot 

 muscle, 377 



effect of pressure, 24 

 muscle receptor organs, 337 

 muscle spindles, 336 

 muscle twitch, 383 

 musculo-epithelial cells, 379 

 mussel. See Mytilus 

 Mustelus, 313, 317, 318. 342, 355, 520 

 M. canis, 124, 179, 186, 287, 301, 342, 510, 



519, 520 

 mutualism, 583 

 Mya, 95, 320, 391 

 M. arenaria, 30, 101, 124, 165, 166, 285, 



286, 327, 328 

 Myctophum, 554, 564 

 M. punetatum, 570 

 myelin-sheath, 420 

 Myliobatis, 313, 319 

 myocytes, 376 

 myofibrils, 378 

 myogenic heart, 107 

 myoglobin (myohaemoglobin), 173, 478 

 Myoxocephalus, 301 

 M. octodecimspinosus, 287 

 M. quadricornis hexacornis, 162 

 Myriocladus, 605 

 Mysella bidentata, 588 

 mysids, feeding, 226, 239 

 Mysis, 341,421 

 Mystacoceti, 230 

 Mytilicola, 610 

 M. intestinal is, 610 

 Mytilus, 24, 100, 153, 218, 219, 260, 275, 



295, 297, 298. 366, 367, 368, 369. 370, 



378, 379, 381, 382, 391, 392, 393, 481, 



593, 648, 649 

 M. californianus, 86, 160, 169, 219, 423, 



474, 486 

 M. crassitesta, 383 

 M. edulis, 30, 35, 86, 88, 152, 155, 161, 165, 



169 3 216, 229, 286, 383, 423, 610 



Myxicola, 137, 148. 384, 434, 437, 656 

 M. infundibulum, 139, 420, 422, 434, 469, 



478 

 Myxine, 142, 320, 327 

 M. glutinosa, 328 ; 518 ; 678 

 Myzostoma cirriferum, 596 

 M. pulvinar, 596 

 Myzostomaria, 596 



naphthoquinones, 174, 480 

 Narcine, 400 

 N. brasiliensis, 397 

 Nassarius : 293, 646 

 Natica, 235 

 N. millepunctata . 234 

 Naucrates due tor, 584 

 nauplius, 602, 606 

 Nautilus, 17, 309, 650, 651 

 N. pompilius, 633 

 Neanthes, 93, 96 



Neanthes (= Nereis) virens, 43, 101, 124, 

 152, 169, 238, 351, 422, 434, 438, 459 

 Nebalia, 227 

 nekton, 2 



nematocysts, 237, 372, 373, 585, 587, 664 

 nematodes, 593 

 Nematodinium, 372 

 Nemertesia, 412 

 nemertines — 



blood vessels, 90 



commensalism, 590 



feeding, 238 

 Neothyris, 211 

 N. lenticularis, 213 

 nephridia, 292, 296, 365 

 Nephrops, 239, 257, 258, 274 

 N. norvegicus, 474, 642 

 Nephthvs, 184, 422 

 N. hombergi, 185, 186 

 Nereis, 23, 99, 117, 138, 330, 418, 434, 435, 

 445, 449, 454 



See also Neanthes 

 N. diversicolor, 42, 165, 183, 224, 478, 485 

 N. fucata, 589 

 N.pelagica, 35,42, 284 

 N. virens. See Neanthes virens 

 Nerita, 149 



nerve, effect of pressure, 24 

 nerve-fibres, 417 



nerve-net, 420, 421, 447, 451, 567 

 nervous system, 415 

 nervous transmission, 417, 421 

 neurogenic hearts, 113 

 neuroid transmission, 416 

 neuromotor system, Protozoa, 416 

 neuromuscular transmission, 380 

 neurones, 417, 418 

 neuropile, 420 



neurosecretion, 116, 315, 444, 445. 516 

 nicotine, 112, 113, 442 

 nitrogen excretion, 281, 618 

 nitrogenous pigments, excretion, 283 

 Noctilio, 247 



