554 



INDEX 



Pomatoceros, habitat, 300, 340 



Pompholyx, 201, 203, 225 



Pontobdella, 393, 401, 404, 406 



Pontodora, 314 



Pontodrilus, 366, 370, 383 



Pontoscolex, 350, 366, 387 f. ; chaeta, 

 351 



Pore, in Polyzoa, 471, 482, 522, 524 ; 

 median, 484, 524 ; dorsal, 348 



Porella, 516, 518, 522, 527, 529 



Porina, 518, 527, 529 



Potamilla, 338 



Praeoral lobe ( = Prostomium), 245, 439 



Predaceous worms, 304 



Priapnloidea, l t 446 ; anatomy, 430 ; 

 classification, 432 ; habits, 433 



Priapulus, 430, 431, 432 ; anatomy, 430 f. 



Pristina, 377 



Proales, 204, 224, 226, 227 



Proboscidae, 49 ', occurrence, 44 



Proboscis, of Nemertinea, 100, 101 f., 103 

 f. ; of Hoplonemertea, 104, 110 ; open- 

 ing by mouth, 117, 119 ; severance of, 

 116 ; of Acanthocephala, 174 f . ; of 

 Kotifers, 203 ; of Kinorhyncha, 237 ; 

 of Echiuroidea, 434 



Proboscis-pore of Nemertinea, 102, 103 



Proboscis-sheath of Nemertinea, 103, 103 f. 



Procerodes, 42 



Procerodidae, J/2 



Procerus, host of Gordius, 172 



Procotylea, 36, 42 



Proglottis, 5, 74, 75, 79, 85 



Promesostoma, occurrence, 44 ; British 

 species, 49 



Proporidae, 49 



Proporus venenosus, 49 



Prorhynchidae, 49 



Prorhynchus sphyrocephalus, terrestrial 

 habit, 44 ; P. stagnalis, 49 



Prosorhochmus claparedii, 110, 114, 117 



Prostate - gland, of Leptoplana, 16; of 

 Polyclads, 30 ; of Planaria, 39 ; of 

 Ehabdocoela, 47 ; of Oligochaeta, 361 



Prostheceraeus, 19, 22 ; spermatophores, 

 27 



Prosthiostomatidae, 19 



Prosthiostomum, 17, 18, 19, 24 



Prostomial tentacles, 248, 262 



Prostomium, 241 ; of Dinophilus, 243 ; of 

 Polygordius, 244 ; of Trochosphere, 245 ; 

 of Nereis, 248 ; of Polychaeta, 259 ; of 

 Glyceridae, 320 ; of Terebellidae, 327 ; 

 of Oligochaeta, 348 



Protodrilus, 242, 244 



Protonemertini, 112 



Protida, 341 ', genital organs, 273, 274 ; 

 eggs, 275 



Prouho, on Polyzoa, 489, 507 f. 



Provisional chaetae, 274 



Provortex, British species, 50 



Proxenetes, 44 ; British species, 49 



Pruvot, on Polychaeta, 261 



Psamathe, 300, 808 



Psammolyce, 313 ; elytra, 294, 313 



Pseudalius, 135, 142, 163 



Pseudaxine, 73 



Pseudoceridae, 19, 20 



Pseudoceros, 19, 20 



Pseudocotyle, 73 



Pseudorhynchus bifidus, 49 



Psygmobranchus, 341 



Pterobranchia, 461 



Pterodina, 200, 201, 203, 206, 211, 215, 



216, 225, 226, 230 

 Pterodinidae, 201, 225 

 Pteroessa, 224 

 Pteronella, 73 

 Pterostichus niger, infested by Oordius, 



170, 170, 172 

 Pterosyllis, ciliated lappets, 273 n. 

 Pyriform organ, 509, 511 



Quatrefages, on Gephyrea, 411, 445 



Rabbit, parasites of, 141, 145 



Ragworrn, 322 



Railliet, on Cestodes, 91 



Rami, in Rotifers, 210 



Rasping plate, of Eunicidae, 270 



Rattulidae, 210, 225 



Rattulus, 212, 225, 226 



Ratzel, on Earthworms, 350 



Red Cat, 316 



Regeneration of lost parts, in Polyclads, 

 26 ; in Triclads, 40 ; in Cestodes, 77 

 in Nemertinea, 115 ; in Polychaeta, 

 278, 282 ; in Oligochaeta, 348, 379 ; in 

 Polyzoa, 471, 488 



Repetition of parts, 249 



Replacement of species, 300 



Reproduction (and Reproductive organs), of 

 Leptoplana, 14 f. ; of Polyclads, 26, 30 : 

 of Triclads, 31, 38, 39 ; of Rhabdocoe- 

 lida, 45, 47 f. ; of Temnocephala, 54 ; of 

 Polystomatidae, 57 f. ; of Dipluzoon, 

 60 ; of Digenea, 65 ; of CaUiobothrium, 

 75 ; of Schistocephcdus, 86 ; of Mesozoa, 

 93 f. ; of Nemertinea, 102, 103, 104, 

 109 ; of Nematoda, 134 ; of Nemato- 

 morpha, 166, 169 ; of Acanthocephala, 

 178 ; of Chaetognatha, 188 ; of Roti- 

 fera, etc., 216, 234, 238 ; of Archianne- 

 lida, 243 f. ; of Polychaeta, 253, 254, 

 256, 269, 273 ; of Myzostorna, 343 ; of 

 Oligochaeta, 360 ; of Leeches, 401 ; of 

 Gephyrea, 418, 431, 437 ; of Phoronis, 

 457 ; of Polyzoa, 471, 490, 501, 506 

 see also Ovary and Asexual reproduction 



Reptiles, parasites of, 163 



Respiration, in Nereis, 252 ; in Chaetopoda, 

 272 ; in Gephyrea, 416 



Retepora, 479, 515, 518, 527 



Rhabdites (rods), of Leptoplana, 11, 12 ; in 



