552 



INDEX 



Paludicola, 30, Jf.2 



Panthalis, 313 



Paragnaths, 248, 250, 316 



Parapodium, of Nereis, 246, 247 ; of Poly- 



cliaeta, 264 f. ; of Heterouereid, 276, 



277 ; muscles of, 247 ; glands of, 249, 



314 ; of Myzostoma, 342 

 Paraseison, 212, 225, 226 

 Parasitic, Turbellaria, 51 ; Polyclads, 22 ; 



Triclads, 32 ; Rhabdocoela, 45, 51 ; 



Nemertinea, 101, 119 ; Rotifers, 204, 



227 ; Polychaeta, 297 ; Leeches, 406 

 Parasitism, effect on the parasite, 161, 177; 



effects on the host, 162 

 Parenchyma, in Leptoplana, 11, 12 ; of 



Midler's larva, 29 ; in Triclads, 41 ; in 



Acoela, 42 ; in Cestodes, 85, 86 

 Parovaria, of Phagocata, 38 n. 

 Parthenogenesis, amongst Rotifers, 200 

 Pectinaria, 330 ; body, 259 ; tube, 285, 



287 ; P. auricoma, tube, 288 ; P. belgica, 



330 

 Pectinatella, 496, 497, 505, 512, 518 ; 



statoblast, 502 

 Pedalion, 200, 201, 206, 211, 216, 223, 



224, 225, 228, 230 

 Pedalionidae, 223 

 Pedetes, 221/. 

 Pedicellina, 487, 488, 490, 506, 507, 518 ; 



larva, 510, 513 ; budding, 514 ; on 



Polychaeta, 299 

 Pelagic, Nemertinea, 101, 114; Chaeto- 



gnatha, 189 ; Rotifera, 226 ; Polychaeta, 



291, 294, 314 ; larvae of Polychaeta, 



300, of Polyzoa, 520 

 Pelagobia, 314 

 Pelagonemertes, 101, 114 

 Pelodera, 129, 131, 133 

 Pelodrilus, 369, 377 

 Pelodytes, 134 

 Penis, of Leptoplana, 14, 15 ; of Polyclads, 



27 ; of Planaria, 38, 39 ; of Rhabdo- 



coelida, 47 ; of Temnocephala, 54 ; of 



Calliobothrium, 75 ; of Schistocephahis 



(cirrus-sac), 86 

 Pennant, on Hirudinea, 406 n. 

 Pereyaslawzewa, on Acoela, 44 n. 

 Pergens, on Polyzoa, 500 

 Perichaeta, 351, 357, 358, 372, 381, 381 f., 



388, 394, 403 

 Perichaetidae, 357, 362, 380 

 Perienteric, blood-sinus, 252 

 Perionyx, 381 

 Perissog aster, 383 

 Peristome, 481, 482, 522, 524 

 Peristomial (tentacular) cirri, of Nereis, 



248 ; of Polychaeta, 263 ; nerves to, 254 

 Peristomium, of Nereis, 248 ; of Poly- 

 chaeta, 263 ; of Sabellidae, 336 

 Perrier, on Oligochaeta, 367, 385 

 Petalostoma, 422, 426, 430, 447 

 Petromyzon, host of Gordius, 173 



Petta, intestine of, 271 



Phagocata, 31, 32 



Phalacrophorus, 314 



Phanerocephala, 258, 303 



Pharynx, 4 ; of Leptoplana, 8, 9, 12, 14 ; 

 of Polyclads, 17, 24 ; of Liscocelis, 23 ; 

 development of, in Polyclads, 29, 30 ; of 

 Triclads, 31, 37, 39 ; of TeywocepJuxla, 

 53, 54 ; of Polystomatidae, 56 ; of 

 Digenea, 62, 64 ; of Nereis, 249, 250, 

 251 ; of Polychaeta, 269 



Phascolion, 423, 425, 428 



Phascolosoma, 416, 420, 423, 425, 428, 

 447 ; as host of Loxosoma,, 489 



Philippi, on Hirudinea, 406 



Philodina, 208, 222, 227 



Philodinidae, 222 



Phoronis, 450 f., 451, 452, 453, 455 ; 

 habits, 451 ; anatomy, 453 f., 457 ; 

 development, 458; 458 ; species, 460 ; 

 affinities, 461, 512 



Phosphorescence (and light - producing 

 organs), in Rotifers, 226 ; in Poly- 

 chaeta, 272, 295, 296 ; in Oligochaeta, 

 368 ; in Polyzoa, 478 



PhotodHlus, 368, 383 



Photogen (light - producing organ), of 

 Polyophtliahnus, 272 ; of Tomopteris, 

 296, 315 



Phreodrilus, 369, 379 



Phreoryctes, 367, 377 



Phreoryctidae, 376 



Phylactella, 528, 530 



Phylactolaemata, 476, 493 f., 518 ; lopho- 

 phore, 476, 495 ; occurrence, 493 ; 

 movements, 494, 496 f. ; reproduction, 

 501, 506, 507 ; larva, 511, 512 ; distri- 

 bution, 493, 504 ; affinities, 512 



Phyllacanthinae, 91 



Phyllobothrinae, 91 



Phyllobothrium, 76 n., 91 



Phyllocotyle, 73 



Phyllodoce, 313, 314 ; head, 262, 263 ; 

 eggs, 275, 314 n. ; colours, 291, 292 ; 

 parapodium, 264 ; chaeta, 267 



Phyllodocidae, 258, 313 ; parapodial cirri, 

 266 ; as food, 297 ; eggs, 314 ; colours, 

 292, 293 



Phyllodocites, 302 



Phyllonella, 73 



Phymosoma, 413, 420, 421, 423 f., 425, 

 426 



Physaloptera, 163 



Pig, parasites of, 68, 79, 139, 147, 184 



Pigments, of Polychaeta, 291 f.; of Gephy- 

 rea, 435 



Pike, Trematode of, 62 ; Cestode of, 81, 84 



Pilidium larva, 113, 113, 229, 230 



Pionosyllis, 308 



Piscicola, 393, 406 



Pista, 328 ; gill of, 329 



Pits, ciliated, of Polychaeta, 272, 273 



