526 



MOLLUSCA — BRACHIOPODA 



Myacea, 4^6 



Myalina^ 449 



Mycetopus, 307, 316, 344, 452 



Myochama, 458 



My odor a, 458 



Myophoria, 448 



Myopsidae, 389 



Myrina, 449 



Myristica, 4^4 



Mytilacea, 448 



Mytilimeria, 458 



Mytilops, 452 



Mytilopsis, 14 



Mytilus, 258, 449 ; gill filaments, 166, 

 285 ; M. edulis, 14, 165 ; attached to 

 crabs, 48, 78 ; pierced by Purpura, 

 60 ; Bideford Bridge and, 117 ; rate 

 of growth, 258 ; stylet, 240 



Myxostoma, 414 



Nacella, 405 



Naiadina, 449 



Nanina, 278, 300 f., 335, 440 ; radula, 



217, 232 

 Napaeus, 296-299, 316, 442 

 Naranio, 454 

 Narica^ 412 

 Nassa, 423 ; egg-capsules, 126 ; sense 



of smell, 193 

 Nassodonta, 423 

 Nassopsis, 332 

 Natica, 246, 263, 411 ; spawn, 126 ; 



operculum, 268 

 Naticopsis, 409 

 ' Native ' oysters, 106 

 Nausitora, 15 

 Nautiloidea, 393 

 Nautilus, 254, 392, 395 ; modified arms, 



140 ; eye, 183 ; nervous system, 206 ; 



radula, 236 ; kidneys, 242 

 Navicella, 267, 268, 324, 327, 410; 



origin, 17 

 Navicula, 358, 442 

 Navicula (Diatom), cause of greening 



in oysters, 108 

 MctoteiUhis, 389 

 Neda, 431 



Nematurella, 12, 297 

 Nembrotha, 434 

 Neobolus, 504 

 Neohuccinum^ 424 

 Neocyclotus, 357, 358 

 Neomenia, 8, 133, 216, 228, 404, 404 ; 



breathing organs, 154 ; nervous sys- 

 tem, 203 

 Neothauma, 332 

 Neotremata, 511 

 Neptunea, 252, 262, 423 ; egg-capsules, 



126 ; capture, 193 ; monstrosity, 251 

 Nerinea, 417 

 Nerita, 17, 41O; N. polita used as 



money, 97 



Neritidae, 260, 410 ; radula, 226 



Neritina, 256, 410 ; origin, 16, 17, 21 ; 

 egg-laying, 128 ; eye, 181 ; distribu- 

 tion, 285, 291 f., 324, 327; N. fluvia- 

 tilis, habitat, 12, 25 



JSferitoma, 410 



Neritopsis, 409 ; radula, 226 ; opercu- 

 lum, 269 



Nervous system, 201 f. 



Nesiotis, 357, 442 



New Zealanders, use of shells, 99 



Mcida, 41s 



Ninella, 409 



Niphonia, 4O8 



Mso, 422 



Mtidella, 423 



Nodulus, 415 



Notarchus, 431 



Nothus, 358, 442 



Notobranchaea, 438 



Notodoris, 434 



Notoplax, 403 



Novaculina, 305 



Nucula, 254, 269, 273, 447 



Nuculidae, otocyst, 197 ; foot, 201 



Nuculina, 448 



Nudibranchiata, 432 ; defined, 10 ; pro- 

 tective and warning colours, 71 f.; 

 breathing organs, 159 



Nummulina, 295 



Mtttallina, 403 



Obba, 311, 315, 441 



Obbina, 306, 311, 312, 314, 319 



Obeliscus, 442 



Obolella, 496, 504 ', stratigraphical dis- 

 tribution, 506, 508 



Obolidae, 496, 504, 508 



Obolus, 504, 508 ; embryonic shell, 509 



Ocinebra, 423 



Octopodidae, hectocotylised arm, 137, 

 139, 140 



Octopus, 379-386; egg-capsules, 127; 

 vision, 184 ; radula, 236 ; crop, 238 



Ocythoe, 384 ', hectocotylus, 138 



Odontomaria, 407 



Odontostomus, 358, 442 



Odostomia, 250, 422 ; parasitic, 78 



Oesophagus, 237 



Ohola, 434 



Oigopsidae, 390 



Oldhamina, 506, 508 



Oleacina, habits, 55 



Oliva, 199, 255, 275, 425, 4S6 



Olivancillaria, 426 



OUvella, 260, 267, 426 ; 0. UpUcata as 

 money, 97 



Olivia, 4O8 



Omalaxis, 413 



Omalonyx, habitat, 23 



0)nmastrephes, 6, 378, 390 



Ommatophores, 180, 187 



