614 



INDEX. 



Mergulus, 445. 



Mcropidce, 463. 



Merostomata, 198 ; characters and divi- 

 sions of. 209: distribution of. in time. 

 220. 



Merulidce, 461, 462. 



Merycotherium, 569. 



Mesenteries (of Actinozod), 110, 112, 113, 

 115, 127. 



Mesopodium, 287, 293. 



Mesothorax, 234. 



Metamorphosis, 33 ; of Myriapoda, 231 ; 

 of Insecta, 239; incomplete, 239; com- 

 plete, 240. 



Metapodium, 287, 293, 297. 



Metasoma, 299, 307. 



Metastoma, of Lobster, 216 ; of Euryp- 

 terida, 210, 211. 



Metathorax, 234. 



Microconchus, 188. 



Microlestes, 559, 560. 



Milwla, 51. 



Miliolida, 54. 



MUleporidce, 134. 



Millipedes, 230, 232. 



Mites, 221. 



Mitra, 294. 



Modeeria, 97. 



Modiola, 284. 



Mole, 474, 477, 483, 550. 



Mollusca, 14 ; general characters of, 253- 

 257 ; digestive system of, 253 ; circula- 

 tory system of, 254 ; respiratory organs 

 of, 254 ; nervous system of, 255 ; sense- 

 organs of, 255 ; reproduction of, 255 ; 

 shell of, 255-257 ; divisions of, 257 ; dis- 

 tribution of, in time, 275, 312. 



Mollusca Proper, 257 ; characters of, 278 ; 

 divisions of, 278 ; distribution of, in time, 



2. 

 uscoida, 257 ; characters and divisions 



of, 258 ; distribution of, in space, 275 ; 



in time, 276. 

 Monads, 35, 36. 

 Monitor, 411. 



Monkeys, 475, 476, 482, 483. 

 Monodelphia, 485. 

 Monodon, 511. 

 Monomerosomata, 224, 225. 

 Monomyaria, 283. 

 Monostega, 54. 

 Monothalamia, 52. 

 Monotremata, 473, 474, 482, 484, 485, 486; 



general characters of, 489 ; distribution 



of, in space, 490 ; in time, 560. 

 Mopsea, 133. 

 Morphology, 11. 

 Morse, 533. 

 Mosasaurus, 413. 

 Moschidce, 520, 522. 

 Moschus, 522. 

 Motacillince, 462. 

 Mother-of-pearl, 256. 

 Moths, 247. 

 Mud-fish, 375. 

 Mugilidce, 363. 

 Mulleria, 284. 



Multivalve shells, 256, 286, 290. 

 Murchisonia, 295. 

 Murex, 294. 

 Muricidce, 291, 294. 

 Muridce, 544, 545. 



Mus, 545. 



Musca, 247. 



Muscicapidce, 461. 



Musk-deer, 520, 522. 



Musk-ox, 526. 



Mustela, 536. 



Mustelidce, 536. 



Mutilata, 503. 



Mya, 283, 285. 



Myacidce, 284, 285. 



Mycetes, 555. 



Mylodon, 563, 569. 



Myochama, 285. 



My odes, 545. 



Myopotamus, 543. 



My ox idee, 545. 



Myoxus, 545. 



Myriapoda, 191 ; general characters of, 



230 ; development of, 231 ; distribution 



of, in time, 232. 

 Myrmecobius, 495, 496. 

 Myrmecophaga, 479, 501. 

 Myrmecophagidce, 501. 

 Myrmeleo, 244. 

 Mytilidce, 283, 284. 

 Mytilus, 284. 

 Myxine, 356, 357. 

 Myxinidce, 355. 

 Myxinoids, 352, 356. 



NACREOUS shells, 256. 



Naididce, 182, 183. 



Nais, 183, 188. 



Naja, 406. 



Narwhal, 510, 511. 



Nassa, 294. 



Nasua, 535, 536. 



Natatores, 442; general characters of, 



443, 444. 

 Nathetes, 413. 

 Natica, 294. 

 Naticidce, 292, 294. 

 Nautilidce, characters of, 309 ; sections 



of, 312; distribution of, in time, 314. 

 Nautiloid shells (of Foraminifera), 53, 54. 

 Nautilus, Paper, 299; shell of, 303; 

 Pearly, 299 ; anatomy of, 307'; shell of, 

 304. 



Nebalia, 220. 



Nectocalyces, 89 ; structure of, 90 ; in 

 Calycophoridce, 90 ; in Medusidce, 96 ; 

 distinguished from the umbrella of 

 Lucernarida, 99. 

 Nectosac, 90. 



Needham, moving filaments of, 302. 

 Nematelmia, 158 ; characters of, 168. 

 Nematocysts, 76. 



Nematoda, 158, 168; characters of, 169 ; 

 parasitic forms of, 169-171 ; free forms 

 of, 171. 



Nematophores, 87. 

 Nemertes, 167. 



Nemertida, 159 ; characters of, 167 ; de- 

 velopment of, 167. 

 Nereidcn, 188. 

 Nereidea, 185. 

 Nereis, 189. 

 Nerita, 295. 

 Neritina, 295. 

 Neritidce, 292, 295. 

 Nervures, 234. 

 Neuropodium, 179. 



