318 



INDEX. 



Maclurea, 267, 283 

 Macrobiotidce, 201 



Macrura, 177; cliaracters of, 

 192 



Mactra, 257 



Mactridce, 256, 257 



Afadrepoi-idee, 118, 120 



Madreporiform tubercle of 

 Echinodermata, 125, 130 



Afalacodermata (Zoa?itharia), 

 99 



Malacostraca. 177 ; characters 

 of, 189 



Maltophaga, 217 



Malpighian tubes of Insects, 

 212 



Mandibles, of Lobster, 176 ; of 

 Arachnida, 198 ; of Mi/ria- 

 poda, 207 ; of Insecta, 211, 

 212 ; of Cephalopoda, 271 ; 

 of Nautilus, 278 



Mantis, 219 



Mantle, of Tunicata, 241 ; of 

 Jirachiopoda, 245 ; of Ln- 

 mellibranchiata, 253 ; of 

 Oaderopoda,2t>8 ; of Cepha- 

 lopoda, 270 ; of Nautilus, 278 



Manubrium, 73, 85 



Marginal bodies of Medusae, 86 



Marginella. 205 



Marsupites. 139 



Mastax, 150 



Maxillje, of Lobster, 176; of 

 Arachnida, 198; of Insecta, 

 211, 212 



Maxillipedes of Lobster, 176 



Meandrina, 106, 118 



Measles, of pig, 146 ; of ox, 146 



Mednsidce, 84 ; structure of, 

 85 ; exact nature of, 86 



Megalotrocha, 155 



Melania, 26(5 



Melaniadce, 263, 266 



Melicerta, 157 



Men turn, 21 1 



Merostomata, 173, 177 : charac- 

 ters and divisions of, 1 87 



Mesenteries, of Actinia, 98, 100 



Mnsopodium, 259 



Mesothornx, 210 



Metamorphosis, 31 ; of Myria- 

 poda, 207 ; of Insecta, 213 ; 

 incomplete, 214; complete, 

 214 



Metapodium, 259 



Metasoma, 270, 278 



Metastoma, of Lobster, 176 ; 

 of Eurypterida, 189 



Metathorax, 210 



MicrocoHchus, 168 



Afi/iolida, 49 



Millepedes, 207 



Milleporidce, 118, 120 



Mites, 201 



Mitra, 265 



Afodiola, 256 



Mollusca, 227 ; general cha- 

 racters of, 227 ; digestive 

 system of, 227 ; circulatory 

 system of, 228 ; respiratory 

 organs of, 228 ; nervous sys- 

 tem of, 228 ; sense-organs of, 



229 ; reproduction of, 229 ; 

 shell of, 229-231 ; divisions 

 of, 231 ; distribution of, in 

 time, 249, 250, 282, 283, 284 



Mollusca, Proper, characters 

 of, 251 ; divisions of, 251 ; 

 distribution of, in time, 282- 

 284 



Molluscoida, 231 ; characters 

 and divisions of, 232; dis- 

 tribut ion of, in space, 248 ; 

 in time, 249 



Monads. 33 



Monomerosomata, 201 



Monomyaria, 255 



Monostega, 50 



Monothalamia, 47 



Mopsea, 1<>8, 119 



Morphology, 10 



Mother-of-pearl, 230 



Mtitleria, 256 



Multivalve shells, 230, 258, 262 



Murchisonia, 266 



Murex, 265 



Mi/ridden, 262, 265 



Musca, '2'2'2 



Mya, 255, 257 



Afyacidee, 256, 257 



Myochama, 257 



Myriapoda, 171 ; general cha- 

 racters of, 206 ; development 

 of, 207 ; distribution of, in 

 time, 208 



Myrmeleo, 219 



Mytilidce, 255, 256 



Mytilus, 255, 256 



Nacreous shells, 230 



Naididce, 163 ; gemmation of, 

 164 



Nais, 168 



Natsa, 265 



Natica, 266 



Naticidx, 263, 266 



Nautili da;, characters of, 279 ; 

 sections of, 282 ; distribu- 

 tion of, 284 



Nautilus, pearly, anatomy of, 

 278 ; shell of, 274, 278 ; 

 paper, 275 ; shell of, 274 



Nebalia, 196 



Nectocalyces, 78 : structure of 

 in Calyeopfioridae, 80 : in Me- 

 dusai, 85 ; distinguished from 

 umbrella of Lucet-narida, 87 



Nectosac, 80 



Needham, moving filaments 

 of, 272 



Nematelmia, 141 ; characters 

 of, 150 



Nematocysts, 67 



Nematoidea, 141 ; characters 

 of, 151 ; parasitic forms of, 

 152 ; free forms of, 153 



Nematophores, 78, 83 



Nemertes, 150 



Nemertidce, 142 ; characters of, 

 150 ; development of, 150 



Nereides, 168 



Nereidea, 166 



Nereit, 169 



Nerita, 266 



Jferitaia, 2fi6 



Neritidce, 263, 266 



Nervures, 210 



Neuropodium, 161 



Neuroptera, 219, 226 



Nidamental ribbon, 229 



Noctilttca, 64 



Nodosaria, 48 



Notommatina, 157 



Notonecta, 218 



Notopodium, 160 



A'ndeobranchiata, 262 (see He- 

 teropoda) 



Nucleolus of Paramaecium, 59, 

 60 



Nucleus, of Protozoa, 39 ; of 

 Amoeba, 44; of Paramce- 

 ciitm, 59, 60 ; of Yorticella, 

 61 ; of Echinodennata, 12~i, 

 130 (see Madreporiform tu- 

 bercle) ; of the sheU of Mol- 

 lusca, 230, 261 



Niidibranchiata, 229 ; charac- 

 ters of, 264 ; divisions of, 267 



Nummulites, 49, 51, 52 



Nummulitic Limestone, 52 



Nymph, 214 



Nymphoii, 201 



Obolus, 248 



Ocelli, of Medusa*, 86; of 

 Echinoidea, 12-5; of Axte- 

 roidea, 130; of Planariiln, 

 149; of Rot if era, I'n ; of 

 Annelida, 162 ; of Chcetonna- 

 tha, 169 ; of Limulus, 187 ; 

 of Arachnida, 200 ; of MII- 

 riapoda, 207 ; of Insttcta, 

 213 ; of Tunicata, 242 ; of 

 LameHibranchiata, 229 



Octopoda, 275. 281 



Odopodidce, 275, 281 



Octopus, 273 



Ocu tin idee, 120 



Odontophora, 251, 258 



Odontophore, 259 



Oligocha'ta, 163 

 Oliva, 265 

 Ommaxtrephet, 281 



Onchuna, 178 



O-ncidiadce, 265, 267 



Oncidium, 267 



Oniscus, 191 



Oiiychoteuthis, 271, 281 



Opercutata, 265, 268 



Operculum, of Balanidce, 180; 

 of Gasteropoda, 259 ; of He- 

 teropoda, 264 ; of Pteropoda, 

 268 



Ophiocoma, 140 



Ophioderma, 140 



Ophiolepis, 140 



Opfiittra. 132 



Ophiuridea, 132 



L'phiiiroidea, 122, 123 ; gene- 

 ral characters of, 131 ; fami- 

 lies of, 132; distribution of, 

 in space, 138 ; in time, 140 



Opisthobranchiata, 262, 263, 267 



