556 



INDEX 



Scutum, 525 



Seals, parasites of, 142, 183 



Sea-mat, 466, 477 



Sea-mouse, 312 



Secondary orifice, 522, 524 



Sedentaria, 285 



Segment, 241 ; of Nereis, 246, 247 



Seison, 226 



Seisonaceae, 204, 216, 220 n., 225, 227 



Seisonidae, 226 



Selenaria, 518 ; vibracula, 487 



Selenka, on Sipunculids, 424 n., 447 



Self- fertilisation, in certain Mesostoma, 48 ; 

 in Trematodes, 52, 58 ; in Cestodes, 86 



Semper, on excretory system of Nemer- 

 tinea, 108 ; on Geonemertes palaensis, 

 101 n., 117 ; on mimicry in Polychaeta, 

 294 



Sense-organs, of Leptoplana, 13 : of Poly- 

 clads, 26 ; of Triclads, 36 ; of Trema- 

 todes, 56, 86 ; of Cestodes, 86 ; of 

 Nemertinea, 106 ; of Nematoda, 128 ; 

 of Gordius, 166 ; of Acanthocephala, 

 178 ; of Chaetognatha, 188 ; of Rotifera, 

 etc., 215, 233, 234 ; of Polychaeta, 255, 

 272 ; of Oligochaeta, 354 ; of Leeches, 

 395 ; of Gephyrea, 417 ; of Phoronis, 

 457 



Septum, of Archiannelida, 244 ; of Nereis, 

 249, 251 ; of Polychaeta, 269 ; of Chlor- 

 haemidae, 334 ; of Oligochaeta, 355 ; of 

 Gephyrea, 440 



Serpula, 300, 339, 340 ; fossil, 301 ; tubes, 

 290, 301 ; commensal with Polynoid, 

 298 ; colour, 292 



Serpulidae, 258, 339 ; nerve cords, 255 ; 

 gills, 261 ; operculum, 261 ; cirri, 265 ; 

 thoracic membrane, 266 ; uncinus, 267 ; 

 fission, 281 ; tube, 290 ; colour, 292, 

 293 ; from great depth, 300 ; fossil, 301 



Serpulite chalk,' 301 



Seta, of vibraculum, 484, 485, 486, 517, 

 524 



Setosella, 530 



Sharks, Trematodes of, 62, 72 ; Cestodes 

 of, 78 



Sheep, parasites of, 67, 81, 82, 83 



Sheldon, Miss, on Nemertinea, 99 f. 



Shell-gland, of Leptoplana, 8, 9, 14, 16 ; 

 of Polyclads, 28 ; of Trematodes, 59 ; 

 of Cestodes, 86 



Shield, cuticular, of Polychaeta, 259 ; of 

 Stemaspis, 335 ; glandular see Gland 

 shields. 



Shipley, on Bipalium, 37 ; on Nema- 

 thelminthes, 123 f . ; on Chaetognatha, 

 186 f., 534 ; on Gephyrea, 411 f . ; on 

 Phoronis, 450 f. 



Sialis lutaria, host of Gordius, 171, 172 ; 

 host of Acanthocephala, 185 



Side organs, of Carinellidae, 107 



Siebold, von, on Tape-worms, 76 



Sigalion, 313 



Silliman, on Nemertinea, 101, 109 118 



Silurian, Polychaeta, 301 



Sinus, in Polyzoa, 482, 484, 525 



Siphon, of Capitelliformia, 272, 305 ; 

 Gephyrea, 436 



Siphonogaster, 353, 368 



Siphonostoma, 334 '> commensal, 298 



Sipunculoidea, Jf.12, 420, 446 ; species, 

 426 



Sipunculus, 425 ; history, 411 ; species, 

 426 ; anatomy, 412 f., 413, 415 ; de- 

 velopment, 419, 419 ; food, 422 ; habits, 

 426 



Size, of Cestodes, 5 ; of Polyclads, 20 ; of 

 Land Planarians, 33 ; of Cestodes, 75 ; of 

 Nemertinea, 100 



Slavina, 377 



Sluiter, oh Gephyrea, 429, 447 



Smitt, on Polyzoa, 516 



Smittia, 518, 527, 529 ; zooecium and 

 avicularium, 482 



Snakes, parasites of, 142 



Solenopharyngidae, 50 



Solenopharynx, 50 



Solenophorinae, 91 



Solenophorus, 91 



Sorocelis, 42 



Spadella, 186, 189, 192 ; anatomy, 186 f. ; 

 eggs, 189 ; habits, 190 ; species, 192, 

 194 ; American species, 534 



Spallanzani, on Oligochaeta, 348 



Sparganophilus, 366, 386 ; anatomy, 355 



Spatangus, as host, 298 



Spencer, on Land - Planarians, 34 ; on 

 earthworms, 349, 380 



Spengel, on Gephyrea, 440 



Spermatheca, of Dinophilus, 243 ; of Oli- 

 gochaeta, 362, 363, 364 



Spermatophores, 27, 402 



Spermiducal gland, 361 



Sphaerodoridae, 320 



Sphaerodorum, 321 



Sphaerosyllis, 308 



Sphaendaria, 150, 153, 160, 161 



Sphyranura, 73 ; setae in, 56 



Spine, of Polyzoa, 481, 523 f., 524 



Spinther, 318 



Spio, 322 



Spionidae, 258, 321 ; larva, 274, 275 



Spioniformia, 258, 304, 321 ; peristomial 

 cirri, 263 ; gill, 265 ; chaetae, 266, 267 ; 

 eyes, 272 ; food, 296 



Spirographin, 290 



Spirographs, 338 ; substance of tube, 290 



Spiroptera, 147, 163 ; S. reticulata, 149 ; 

 S. obtusa, 161 ; S. alata, 163 



Spirorbis, 340, 341; operculum, 261, 341; 

 genital organs, 273, 274 ; brood-pouch, 

 261, 276 ; fossil, 301 ; shell, 341 



Spirosperma, 378 ; chaeta, 350 



Spirulaea, 301 



