INDEX. 



337 



Meropodite, 174 



Mesenteries of sea-anemones, 66 



of Arenicola, 92 

 Millport, 35, 81 

 Moulting in crabs, 204 

 Mouth-papillse of Ophiura, 130, 



131 ; of AmpUura, 133 

 Mouth-shields of Ophiura, 130 

 Mysis stage of Norway lobster, 



'206 



Nauplius of Peneus, 327 

 Nematophores of Plumularidse, 57 

 Nephridia, or kidney tubes, 29, 



92, 93 



Nerve-cord of Arenicola, 92 

 North Berwick, 35 



Operculum of acorn-shell, 220 



of coal-fish, 298, 300 



of crabs, 194 



of sea-firs, 53 



of molluscs, 6, 244 



of Serpula, 117 

 Orbits of crab, 160 

 Oscula of sponges, 38 



Paignton, 35 



Pallial sinus of Tapes, 268 



Palps of Nereis pelagica, 84, 88, 



104; of Tapes pullastra, 269 

 Papillae of Doto, 259 



of Eolis, 260, 261 

 of Trophonia, 116 

 Paragnaths of Nereis pelagica, 104 

 Parapodium, 83, 84 



of Nephthys homier gii, 109 

 of Nereis pelagica, S6 

 Pectoral fin of coal-fish, 298, 300 

 Pedicellarise of Echinoderms, 127, 



135 

 Peduncle of crayfish's antenna, 



156 



Pelagic fauna, 2, 319, 325 et seq. 

 Pelvic fins of fish, 300 

 Pentamerous symmetry of sea- 

 urchin, 139 

 Penzance, 35, 63 

 Peristomium of worms, 84 

 of Nereis pelagica, 86 

 of Terebella, 112 



Peri visceral fluid of sea-urchin, 

 139 



Pharynx of fish, 300 

 of Nereis, 87 



Pinnse, or branches of Hydrall- 

 mania falcata, 56 



of Plumularia setacea, 57 



Pinnate tentacles of Alcyonium, 

 75 



Poly carps of sea -squirt, 294 



Polymorphism, 45 



Polype, a name applied to a mem- 

 ber of a Coelenterate colony, or 

 to a simple Ccelenterate, e.g. a 

 sea-anemone, 16, 41 



Poole, 35 



Portland, 35 



Preoperculum of Coitus, 301 



Proboscis of Arenicola, 30 

 of Nemerteans, 120 

 of Nereis pelagica, 87 



Propodite, 174 



Prostomium of Nereis pelagica, 84, 

 86 



Protective coloration, 14, 256 



Radial shield of Opkiothrix fra- 



gilis, 129, 130 

 Radial or radiate symmetry, 29, 



126, 143 

 Radula, 227 



of Chiton, 228 



of limpet, 226 

 Rostrum, 154 



of Decapods, 163 



of Galathea, 178 



of Hippolyte varians, 167 



of lobster, 173 



of Nephrops, 174 



of Palcemon, 165 



St. Andrews, 35, 63, 81, 127, 193 

 Scale of crayfish's antenna, 156 



of Mysis, 212 

 Scales of Polynoids, 95, 96, 97, 



98, 102, 107 

 Scarborough, 35 

 Segmentation, 85 



of Chiton, 229 

 Self-mutilation, 11, 126 

 Septa of bristle- worms, 91, 92 



