286 



THE LIFE OF CRUSTACEA 



Natantia, 58; used for food, 



243 



Nauplius of Penceus, 73; of 

 Crayfish, 79; of Opossum 

 Shrimp, 79 ; of Branchio- 

 poda, 80; of Cyclops, 82 ; of 

 Ostracoda, 82 ; of Barnacles, 

 83 ; of Lepas, 148; of Lepto- 

 dora, 170; of Sacculina,2^; 

 eye, 40 



Nebalia, 44; fossil allies, 261 



Nebaliacea, 44 



Necton, 138 



Nematocarcinidae, 128 



Nephrops, 33 ; larva, 71 ; dis- 

 tribution, 132 ; fishery, 240 



Nephropsidea, 33, 60 



Nephropsis, 121 



Neptunus, 156 ; used for food, 



249 



Neritic plankton, 141 

 Nervous system of Lobster, 



20 



Niphargus, 184 

 Northern Crayfishes, 176 

 Norway Lobster, 33; larva, 



7 1 ; fishery, 240 

 Norwegian Prawn, 246 

 Notostraca, 36 ; habits, 162 



Oceanic plankton, 141 



Octopus preying on Crustacea, 

 89 



Ocypode, 188; habits, 104; car- 

 nivorous, 195 



Olfactory filaments of Lobster, 

 25 



Oniscns, 51 ; structure and 

 habits, 201 



Operculata, 43 



Opossum Shrimps, 46 ; de- 

 velopment of, 79 



Orchestia, 107 



Orientation, organs of, 24 



Ostracoda, 38; development, 

 81 ; luminosity, 127, 151; 

 plankton, 144 ; fresh-water, 

 172; of Tanganyika, 184; 

 fossil, 261 



Ovary of Lobster, 27 



Oxyrhyncha, 64 ; masking 

 habits, 96; fossil, 270 



Oxystomata, 63 ; habits, 101 ; 

 protective resemblance, 109 ; 

 deep-sea, 128; fossil, 269 



Oxyuropoda, 266 



Oyster Crab, 249 



03 sters and Pea Crab, 217 



Paguridea, 61 



Paguropsis and Sea-anemones, 



214 

 Palcemon, 1 79 ; used for food, 



248 



Paltzemonetes, 174 

 Palinura, 59 



Palinuridae, 241 ; fossil, 269 

 Palinurus,\arva of, 72; fishery, 



240 



Palp, 14 

 Pandalus, 59, 1 37 ; used for 



food, 245 

 Panulirus, 241 

 Paracyamus, 55 

 Paranaspides, 264 

 Paranephrops, 177 

 Parapagurus, 124; and Sea- 

 anemones, 213 

 Parasitism, 208 

 Parastacidae, 176 

 Parastacus, 178 

 Partan, 248 

 Parthenogenesis, 163; ofCla- 



docera, 166 ; of Ostracoda, 172 

 Pea Crab, 217 

 Pedunculata, 43 

 Peltogaster, 232 

 Penseidea, 59; fossil, 267 

 Penceus, 59 ; larvse, 73 ; used 



for food, 247 ; fossil, 268 

 Peracarida, 46 ; development, 



78 



Pericardium, 17 



Peripatus, tracheae of, 204 



Peter's stone, 220 



Philomedes, 38 



Phosphorescence. See Lumin- 

 osity 



Photophoresof Euphausiacea, 

 125 



