INDEX. 



387 



Polystomeje, 194 

 Polystomella, 16 

 Polystomum, 195 

 Polyzoa, 230 

 Pomatiopsis, 339 

 Pompholyx, 308 

 Pond snails, 307, 340 

 Pontobdella, 235 

 Pontolimax, 298 

 Porcelain siiells, 348 

 Poroellanaster, 158 

 Poviferata. 49 

 Porocidaris, 166 

 Porospora, 24 

 Porpita, 107 



Portuguese man-of-war, 104 

 Potamides, 348 

 PotamospongiBe, 67 

 Poulpe, 371 

 Pourtalesia, 173 

 Praya, 103 

 PrayidsE, 106 

 Precious wentle trap, 326 

 Priapulidae, 218 

 Priapulus, 218 

 Primitive stomach, xi 

 Prionecliinus, 170 

 Proboscidifera, 324 

 ProductidEe, 247 

 Proglottids, 198 

 Proueomenia, 293 

 Pronucleus, xlv 

 Prophetic type, xviii 

 Prophysaon, 319 

 Propoclium, 249 

 Prosperpina, 324 

 Protamoeba, 25 

 Proteids, vi 

 Protista, 2 

 Protohydra, 77 

 Protomyxa, 3 

 Protoplasm, v 

 Protoplasta, 4, 14 

 Protospongia, 35, 71 

 Protozoa, 1 

 Psammobia, 280 

 Pseudodifflugia, 15 

 Pseudopodia, 5 

 Pseudospora, 34 

 Psolus, 181 

 Psorosperma, 25 

 Psychyology, xxxi 

 Ptenoglossa, 324 

 Pteraster, 139, 157 

 Pterasteridae, 157 . 

 Pterooera, 350 

 Pteropoda, 356 

 Pfcerotracliea, 356 

 Pterotracheidse, 355 

 Pullenia, 20 

 Pulmonata, 303 

 Pulmonifera, 303 

 Pupa, 316 

 Pupidffi, 316 

 Purple shell, 325 

 Purpura, 334 

 Pycnopodia, 160 

 Pyramidella, 342 

 Pyramidellidse, 342 

 Pyrazus, 348 

 Pyrula, 331 

 Pyxioola, 45 



Quahog, 276 

 Quin, 261 



Eadlal canal, 137 

 Radiata, 135 

 Badio-flagellata, 32 

 Badiolaria, 7 



Radiolarian ooze, 21 

 Ranella, 353 

 Kangia, 279 

 Rapana, 335 

 Rataria, 107, 108 

 Razor clams, 282 

 Reoluzia, 325 

 Red chiton, 294 

 Red coral, 122 

 Redia, 192 

 Renilla, 124 

 Reproduction, xliv 

 Respiration, xxiii 

 Respiratory tree, xx, 177 

 Retepora, 243 

 ReteporidEB, 243 

 Reticularia, 14 

 Rhabditis, 208 

 Ehabdocoela, 190 

 Rhabdogaster, 214 

 Rhabdopleura, 244 

 Rhabdostyla, 45 

 Rhachiglossa, 327 

 Rhaphidonemata, 65 

 Rhipidogorgia, 122 

 Rhizoohilus, 335 

 Rhizocrinus, 142, 146 

 Rhizo-iiagellata, 31 

 Rhizophysa, 104 

 Rhizopoda, 4 

 Rhombogens, 197 

 Rhopalodina, 183 

 Rhyncheta, 47 

 RhynchobdellidsE, 234 

 Rhynchonella, 247 

 Rhynchonellidse, 247 

 Rhyncopygus, 173 

 Ring canal, 137 

 Rissoa, 339 

 Rissoella, 339 

 Rissoidje, 339 

 Roman snail, 313 

 Rossia, 375 

 Rostellaria, 350 

 Rostrum, 373 

 Rotalia, 16, 21 

 Rotella, 323 

 Rotifer, 202 

 Rotifera, 202 

 Round clam, 276 

 Round worms, 212 

 Rudistes, 272 



Sagitta, 214 

 Salenia, 167 

 Salenidse, 167 

 Salpingoeca, 35 

 Sand dollar, 171 

 Sand saucers, 346 

 Sangainolaria, 280 

 Saroodictyon, 124 

 Saxicava, 281 

 Scalaridae, 326 

 Scallops, 260 

 Scapharoa, 268 

 Scaphopoda, 291 

 Scarabus, 306 

 Schizaster, 176 

 Schizosiphon, 46 

 Schizostoma, 342 

 Scorpion shells, 350 

 Scrobicularia, 280 

 Sourria, 321 

 ScutellldsE, 171 

 Scutibranchla, 322 

 Scyandra, 62 

 Scyllea, 299 

 Scyphistoma, 96 

 Scyphostoma, 96 

 Scytomonas, 33 



Searanemone, 113, 115 

 Sea^bluhs, 89 

 Sea-corn, 333 

 Searolam, 278 

 Sea-fans, 116, 121 

 Sea-hare, 303 

 Sea-cucumbers, 176 

 Sea-nettles, 89. 

 Sea-pens, 116 

 Sea-urchins, 161 



„ New England, 169 



Searwash-balls, 333 

 Sea-whips, 121 

 Segmental organs, xx 

 Segmentation, ix 



,, cavity, ix 



,1 nucleus xlvi 



Seison, 203 

 Semele, 280 

 Sensations, xxiv 

 Sense of touch, xxx 

 Sense organs, xxx 

 Sepia, 374 

 SepiadiE, 374 

 Sepiola, 375 

 Sepiolidee, 374 

 Sepioteuthis, 374 

 Septaria, 285 

 Serpent stars, 147 

 Serpula, 226 

 Serpulidae, 226 

 Serripes, 274 

 Sertularia, 86 

 Sertularidse, 86 

 Setae, 29 

 Shell, 249 



„ agate, 316 

 ,, apple, 344 

 „ carrier, 326 

 „ ear, 321 

 „ fig. 352 

 „ gold, 260 

 ,, hammer, 265 

 „ harp, 329 

 ,, helmet, 351 

 ,, idol, 345 

 „ ivory, 333 

 ,, mason, 326 

 „ olive, 328 

 ,, pear, 352 

 „ pelican's foot, 351 

 „ perspective, 326 

 ,, pheasant, 323 

 „ pilgrim's, 261 

 ,, porcelain, 348 

 „ purple, 325 

 „ scorpion, 350 

 ,, silver, 260 

 „ sun dial, 326 

 „ tooth, 291 

 „ top, 322 

 „ tun, 352 



„ weaver's shuttle, 349 

 ,, wing, 349 

 Ship-worm, 284 

 Sigaretus, 347 

 Sight, xxx 

 Silicoidea, 68 

 Siliqua, 283 

 Silver shell, 260 

 Sinistral, 304 

 Sinnespolster, 91 

 Sinupallialia, 257 

 Sipho, 331 

 Siphon, 253, 360 

 Siphonaridse, 305 

 Siphonida, 257 

 Siphonophora, 97 

 Siphonopoda, 291 

 Sipunculidee, 217 



