INDEX. 



697 



Motacillina', 526. 



Mother-of-pearl, 266. 



Moths, 285, 2S. 



Mud-fish, 397, 398, 403, 424. 



Mugilidce, 411. 



Mulleria, 327. 



Multivalve shells, 296, 334. 



Murcenidce, 408. 



Murchisonia, 340. 



Murex, 339. 



Muricidce, 335, 339. 



Muridoe, 620. 



Mus, 620. 



Musca, 285. 



Afuscicaptdce, 526. 



Musk-deer, 592. 



Musk-ox, 598. 509. 



Mustela, 611. 



Mustelidce, 611. 



Mutilata, 570. 



J/ya, 323, 326, 32. 



Myacidce, 327. 328. 



Mycetes, 633, 634. 



Myliobatis, 423. 



Mylodon, 643, 649. 



Myochama, 328. 



My odes, 621. 



Myopotamus, 620. 



Myoxida, 621. 



Myoxus, 622. 



Myriapoda, 218 ; general characters of, 



264 ; development of, 265 ; distribution 



of, in time, 267. 

 Myrmecobius, 563, 564. 

 Myrmecophaga, 545, 568. 

 Myrmecophagidce, 568. 

 Myrmeleo, 281. 

 Myrmica, 289. 

 3/ysts. 246. 

 Mytttidce, 326, 327. 

 Mytilus, S26, 327. 

 Myxine, 403, 405. 

 Myxinidie, 402, 405. 

 Myxinoids, 398, 403. 



NACREOUS shells, 296. 



Naididie, 209, 210. 



^Vcya, 457, 459. 



Narwhal, 579. 



.iVassa, 339. 



Nasua, 610. 



Natatores, 500 ; general characters of, 501. 



flatted, 339. 



Raticides, 335, 339. 



Nauplius, 228. 



Naukilidce, characters of, 356 ; sections of, 



358; distribution of, in time, 360. 

 Nautiloid Foramimfera, 61, 63. 

 Nautilus, Paper, 350; shell of, 351; 



Pearly, 353 ; anatomy of, 16. ; shell of, 



361, 355. 



Nebalia, 237, 253. 

 Nectocalyces, 103; structure of. 105; in 



C'alycophoridce, 105, 106; in Medusid<?, 



Ill ; distinguished from the umbrella of 



the Lucernarida, 114. 

 Nectosac, 105. 



Needham, moving filaments of, 347. '" 

 Nematelmia, 183; characters of, 193. 

 Nematocysts, 87. 

 Nematoda, 183, 184; characters of, 195; 



parasitic forms of, ib. ; free forms of, 197. 



Nematophores, 101. 



Nemertes, 192. 



Nemertida, 184, 192, 193 ; characters of. 



192 ; development of, 193. 

 Neolimulus, 254. 

 Neophron, 530. 

 Nephthys, 215. 

 Nereids, 215. 

 Nereidea, 212. 

 Nereis, 214. 

 Nerita, 340. 

 Neritina, 340. 

 NeritidcK, 336, 340. 

 Nervures, 269. 

 Neuropodium, 206. 

 Neuroptera, 270, 280, 292. 

 Newts, 437, 438. 

 Nidamental ribbon, 295. 

 Noctiluca, 83. 

 Nodosaria, 6J, 62. 

 Nothosaurus, 475. 

 Notidanus, 430. 

 Notochord, 371, 372. 

 Notommatina, 201. 

 Notonecta, 259. 

 Notopodium, 206. 

 Notornis, 508. 

 Nudeobranchiata, 335, 337, 341 (see 



Heteropoda) . 



N ucleolus of Paramcecium, 78, 79. 

 Nucleus, of Protozoa, 48 of Gregarina.5Q ; 



of Amoeba, 55 ; of Infusoria, 78; of For- 



^'ceWa, 80 ; of the shell of Mollusca, 29 *. 

 Nudibranchiata, 332 ; characters of, 336 ; 



divisions of, 341. 

 JVwmenms, 510. 

 Numida, 516. 

 Nummulites, 62, 65, 66. 

 Nummulitic limestone, 66. 

 Nuthetes, 467. 

 Nycticebidce, 632. 

 Nycticebus, 632. 

 Nycticorax, 510. 

 Nymph, 274. 

 Nymphon, 258. 



Obolus, 317. 



Oceanic Hydrozoa, 103 ; divisions of, i'6. e 

 se^. ; distribution of, in space, 123. 



Ocelli, of Medusa, 111; of Echinoidea, 

 ]60; ofAsteroidea, 167; of Planarida, 

 192 ; of Rotifera, 201 ; of Annelida, 207 ; 

 of Chatognatha, 217 ; of Limulus, 240 ; 

 ofArachnida, 257 ; of Myriapoda, 265 ; of 

 Insecta, 273 ; ofTunicaia, 2y5; ofLamel- 

 libranchiata, ib. ; of Gasteropoda, 330. 



Octopoda, 351, 357 



Octopodcdce, 351, 357. 



Octopus, 347, 357. 



Oculinida?, 152. 



Ocypoda, 251. 



Odontaspis, 430. 



Odontoceti, 573, 577. 



Odontophora, 320, 329. 



Odontophore, 330. 



Oedicnemus, 511. 



Oidemia, 506. 



Oldhamia, 123, 318. 



Ol>goch(eta, 210, 216. 



Ommasirephes, 357. 

 Omnivora (Ungulata], 5: 



