Mantis shrimps, 240 (91 ) 

 Many-mouthed jellyfishes, 97'' 

 Margaropus, 252 

 "Marine silk," 187 

 Marlesia. 190 

 Mastax, 139 

 Mastigophora. 21 

 Mastigoproctiis. 248 (105), 



(106) 

 Mediaster. 218 

 Medusa, 68, 70 (6) 

 Megalotractiis, 111 

 Megascolides. 207 

 Megalhiira (48) 

 Mekimpus, 177 

 Meleagrina, 188 

 MeUita. 284. 285* 

 Meloidogyne, 136 

 Memhranipora (33) 

 Mermis, 135* 



Mermithid nematodes, 135* 

 Merostomata, 242 



Mertensia. 1 17 



Mesothuria, 275 



Mesozoa, 15, 133 



Metargiope (114) 



Metazoa, 15 



Metridiiim. 104, 105*, 108 (18) 



(22) 

 Microciona. 64 

 Micron. 18 

 Microstomiim. 121 

 Millepora. 1 13 

 Millepores, 74 

 Millipedes, 241*, 242 (116) 

 Milne-Edwardsia. 105 

 Minyads, 104 

 Mites, 249 (115) 

 Mnemiopsis, 117* 

 Modiolus. 187 

 Molgula. 287 

 Moliusca, 15, 158, 177* 

 Molpadonias, 275 

 Monas. 26 



Monaxonida. 62 

 Moniliformis, 142 

 Monogenetic flukes, 124 

 Monogononta, 140 

 Monoplacophora, 159 

 Monoraphis, 61 

 Monosiga, 26 

 Montastrea. 65*, 113* 

 Moon snail. 179, 183* (55) 

 Mopalia (38) 

 Moss animals, 150* 

 "Mother-of-pearl," 186 

 Multiple fission, 20 

 Miirex. 1 8 1 

 Musculium. 191 

 My a, 190 

 Mycale, 63 

 Mycetozoa, 18 

 Mysidacea, 235 

 Mytilns. 190* (40) 



JY 



Nagana, 26 



Nauplius stage, 231, 232, 233 



Nausitho'e, 80 



Nautilus. 194, 195, 198* (74) 



Necator. 137 



Nematoda, 15, 134* 



Nematomorpha, 15, 141 



Nemertea, 15, 129, 131* 



Neopilina. 159 



Neothyris. 155 



Nephila. 244*, 245 



Nephridia, 156, 159, 200, 208, 



228 

 Neptune's goblet, 62 

 Nereis, 20 1 * 

 Night crawler, 206 



Noctiluca. 24* 

 Notochord, 286 

 Nucleus, 21 

 Nuda, 118 



Nudibranchs. 177, 182 

 Nuinmulites. 30 

 Nuttallina, 160 



o 



Obelia. 71 



Octocorallians, 98 



Octopus. 158*, 194, 197, 199* 



(76-80) 

 Ocypoda. 239 (99) 

 Odontosyllis. 202 

 Oikomonas, 26 



Okenia (61 ) 

 Old-maid's curl, 180 

 Oligochaeta. 204 

 OlivanciUaria (53) 

 Oncicola. 142 

 One-celled animals, 15 

 Oniscus, 234, 236* 



Onychophora, 227 

 Ooperipatus, 119 

 Opalina. 52 

 Opalinids, 52 

 "Opelet," 106 

 Operculina. 30 

 Operculum, 160 



[299 



