INDEX 



713 



Ostia, of heart, 314, 349, 421. 437, 



522, 530; of sponges, 119 

 Ostracoda, 368; 327, 331, 333, 34^, 



349, 351, 353 

 Ostrea, 585; 579, 582; eduhs, 546, 



585, 586 

 Otocyst, see Statocysts 

 Otoplana, 214 

 Ova, 6. See also Eggs 

 Ovarian lamella, 379 

 Ovarioles, 448 



Ovary, see Generative organs 

 Ovicell, 612 



Oviducts, see Generative organs 

 Ovigerous frenum, 379; legs, 539 

 Ovipositor, of Insecta*, 431, 466, 



495, 502; of Phalangida, 538 

 Ovo testis of Helix, 560 

 Oxidation, 131; 140, 143 

 Oxyuris, see Enterobius vermicularis 



Pachytylus migratorius , 467 



Paedogamy, 83 



Paedogenesis, 446 



Paired limbs, see Limbs 



Palaeonemertini, 237 



Palaeophonus, 524 



Palinura, 404 



Palinurus, 415 ; 389 



Pallial arteries and circulation of 



Lamellibranchiata, 580 

 Pallial budding, 679 ; gills, 565 ; sinus, 



616 

 Palliovisceral cords, 547 

 Palmella, 47 



Palolo worm, see Leodice viridis 

 Palps, Labial, see Labial palps; 



Mandibular, see Mandibular palps ; 



of Acarina, see Pedipalps; of 



Polychaeta*, 265, 268 

 Paludicola, 214 

 Paludina, 566; 145, 543, 552, 563; 



vivipara, 551 

 Paniphilus, 501 

 Pancreatic tissue, 594 

 Pandalus, 336 

 Pandorina, 57; 46, 57 

 Panorpa, 429 ; communis, 486 

 Pansporoblasts, 100 

 Panthalis, 267 ; 264 

 Pantopoda, 538 

 Papilio, 492 

 Papilionina, 489, 492 

 Parabasal body, 17 



Paracordodes, 258, 258 



Paractinopoda, see Synaptida 



Paragaster, 117 



Paraglossae, 428 



Paragnatha, 339. See also Mouth parts 



Paramecium, 109; 12, 14, 15, 18, 21, 

 21, 27, 28, 34, 42, 43, 104 and n., 

 106, 116; aurelia, 35; caudatum, 

 21. 34, 42 



Paramitoses, 25 



Paranebalia, 391 



Paraoesophageal (Circumoesopha- 

 geal) connectives, see Nervous 

 system 



Parapodia, of Aplysia, 567 ; of Poly- 

 chaeta*, 261, 264-75 (passim) 



Parasites, 5. See also Parasitic habits 



Parasitic castration, by Isopoda, 398; 

 by Rhizocephala, 383 



Parasitic habits, of Acanthocephala,' 

 259 ; of Acarina*, 534, 537 ; of Ano- 

 plura, 484; of Aphaniptera, 512; 

 of Branchiobdellidae, 301 ; of Cili- 

 ata*, 106, 107, 109, no, in; of 

 Cirripedia, 382 ; of Copepoda, 374 ; 

 of Crustacea, 33 1 ; of Cyamus, 403 ; 

 of Dinoflagellata, 54; of Diptera, 

 512; of Entamoeba, 70; of Hemi- 

 ptera, 476 ; of Hirudinea, 300-1 ; of 

 Histriobdella, 296; of Hymeno- 

 ptera*, 498-502 (passim) ; of Iso- 

 poda, 398 ; of Mallophaga, 483 ; of 

 Nematoda*, 245-57 (passim); of 

 Nematomorpha, 257; of Penta- 

 stomida, 541 ; of Plasmodiophora, 

 86; of Platyhelminthes*, 198, 216; 

 of Polymastigina*, 66 ; of Proto- 

 zoa, 43 ; of Sporozoa*, 87 ; of 

 Trypanosomidae, 63 



Parazoa, see Porifera 



Parenchyma, Parenchymatous tissue, 

 205; 197, 198, 206, 225 



Parthenogenesis, 6 ; of Crustacea*, 

 351, 362, 367, 369; of Gastro- 

 tricha, 243 ; of Insecta*, 446, 479, 

 480, 485, 504 n. ; of Protozoa, 33; 

 of Rotifera, 241 



Parthenogonidia, 58 



Patella, 565 ; 547, 552, 553, 562, 563 ; 

 coeridea, 546 



Peachia, 187; 188 



Pecten, 584; 142, 579, 582, 599; 

 maximus, 584, 584; opercularis, 

 584, 585; tenuicostatus, 585 



