506 



IXDEX 



Myosepta, 466 

 Myotomt'S. 4, 

 !M\Tianida, 275, -77 

 Myriapoda, 40J, 4jj 

 ;Mvriotroihus, 30S 

 Myrmecophaga, 5OJ 

 IMyrmicuia', 4JO 

 jNIyrmecocystus, 427 

 Mysilla, 205 

 IMysis, 376 



stage, 3S0 

 jSIystaceti, 572 

 :Mytilida;, 323 

 !Myxicola, 277 

 Myxine, 403 

 Jilyxobolus, 100 

 jMyxom}'ccles, iSo 

 jNIyxospongia, 205 

 ilyxosporida, mo 

 Wyzobdella, 270 

 INIyzontes, 4113 



Nagana disease, 431 

 Nageli's j^rinciiile of 



gression, 4S 

 Naidida-, 270 

 Nails, 450, 545 

 Nais, 271 

 Naja, 531 

 Nanomia, 210 

 Narcomcdusa-, 21S 

 Naris, 475 

 Narwal, 572 

 Nasal bones, 4^1) 



eapsule, 4^7 

 Natatores, 543 

 Nalicida-, 334 

 Natural selection, 3^ 

 Nauplius, 2S, 3O2 



eye, 362 

 Nausithoe, 224 

 Nautilus, 34O 

 Nebalia, 37 s 

 Neetocalyces, 21S 

 Neetonema, 26,H 

 Ncetoncmertcs, 250 

 Nceturus, 520 

 Ncedhani's sac, 344 

 Ncmatoeysl, 207 

 Ncmatoda, 2O3 

 Nemathelnilnthes, 263 

 Neniatus, 425 

 Ncmerteans, 2^^ 

 Ncmertini, 255 

 Ncmoeera, 430 



Nemojisis, 217 

 Neueraniuni, 4^ ^ 

 Neoerinoida, 302 

 Ne ga-a, 1O2 

 Ni'o-Laniarekisiii, 47 

 Neomeiiia, 31O 

 Neos[)orida, 100 

 Neoteny, 150 

 Nephelis, 284 

 Nephridia, 105, 272 

 Nephridial tubules, 4S6 

 Nej^hrostonie, 105, 242, 4,6 

 Nepida\ 42S 

 Neplunus, 3S2 

 Nereis, 276 

 Neverila, 334 

 Nei"\"c-eord, Neutral, 113 

 Nerve-end buds, 474 

 Nerve libres, S5 



hillocks, 474 

 Ner\es cranial, 471 



eye-muscle, 472 



spinal, 4()S 



s\-mpatbetic, 473 

 Ner\c">us SNSteni, iii 



development of, 30 



of \'ertebrates, 4O7 

 Ner\'Ous tissue, S3 

 Neural arch, 453 



spine, 453 

 Neurapoph^'sis, 4^3 

 Neurenteric canal, 430, 467 

 Ncurites, 84 

 Neuroblasts, 86 

 Neuroglia, 114 

 Neuromasts, 474 

 Neurone, 86 

 Neuropodium, 276 

 Neuropore, 440, 4(18 

 Neuroptera, 421 

 Nettle bodies, 102 



cells, 207, 241 

 Niclilating memlirane, 477 

 Nidamcntal gland, 344 

 Night-hawks, 544 

 Nirmus, 420 

 Nocdluca, 184 

 Noctuina, 433 

 Noinarlhra, 563 

 Nosema, 101 

 Nolhria, 277 

 Noloihord, 438, 4:;2 

 Notochordal sheadi, 452 

 Notodelphida', 3O1) 

 Notoga-a, 1O2 



Notoncclida", 42S 

 Notopodiuni, 270 

 Noluui, 404 

 Nuclear fragmentation, 62 



sj)indle, 00 



substance, 5O 

 N'Lulein, 56 



Nucleoli, chromatic, 57 

 Nialeolus, 57 

 Nucleus, 35 



clea\age, 135 



function of, 58 

 Nacula, 323 

 Nuda, 235 

 Nudibranchia, 335 

 Nummuliles, iSo 

 Nurse, 131 

 Nutrition, 55 

 Nyctotherus, 106 

 Nyraphon, 399 



Obelia, 21S 



Obisium, 304 



Obturator foramen, 522, 



550 

 Occipital bone, 45S 



condyles, 314 

 Occipitalia, 45S 

 Occiput, 405 

 Ocellata', 216 

 Ocellus, 354 

 Ocneria, 433 

 Octocoralla. 230 

 Octopoda, 347 

 Octopus, 330, 347 

 Ocular plate, 207, 304 

 Oculina, 23 r 

 Oculomotor nerve, 471 

 Oilonata, 420 

 Odonloholca-, 541 

 Odontophore, 320 

 Odontorina", 541 

 Odontornithes, 541 

 U'A'anthus, 421 

 U-colog\-, c;o 

 G'.dipoda, 421 

 G'.dogonium, 1 ()o 

 Q'.nothera, 44 



(I''.so]ihageal ner\e ring, 113 

 (Eso]ihagus, 04 

 Oigopsida, 347 

 C)ikopIeura, 443, 444 

 Oil bottles, 424 

 Oka|iia, 36Q 

 Olecranon, 465 



