Peripsocus pliaepterus, 415 



Peripylaea, 71 



Perisarc, 134 



Perisomatic cavity, 345 



Peristome, of Ciliata, 97 ; of Echi- 

 noidea, 564 



Peristomial cirri, 232 



Peristomium, 232; 235, 237 



Peritoneum, 121, 229, 244 



Peritricha, 104; 97, 98 



Peritrophic membrane, of Crustacea, 

 309; of Insecta, 390 



Perivisceral cavity, 122; oi Acantho- 

 bdella, 267 ; of Arthropoda, 279 ; of 

 Chaetopoda, 229 ; of Ciona, 596 ; 

 of Echinodermata, 550; of Mol- 

 lusca, 470; of Rotifera, 209. See 

 also Coelom, Haemocoele 



Perla maxima, 414 



Pernicious malaria, 88 



Perradial, 152 



Petrohius maritimiis, 407 



Phaenoserphus viator, 435 



Phaeococcus, 46 



Phaeodaria, see Tripylaea 



Phaeodium, 76 



Phalangida, 465 



Phalera hucephala, 393 



Pharynx, see Alimentary canal 



Phascolosoma, 269 



Pheretima, 256 



Philodinidae, 212 



Phlehotomiis, 58 



Phobotaxis, 33 



Pholas, 511 



Phoronidea, 545 



Phoronis, 546; 545, 546 



Phorozooids, 608 



Phosphorescent Protozoa, 16 



Photogenic organs of Insecta, 391 



Photosynthesis, see Holophytic nutri- 

 tion 



Phoxichilidiiim femoratum, 467 



Phragmocone, 524 



Phryganea, 427 ; 426 



Phylactolaemata, 536; 532 



Phyllohiiis urticae, 401 



Phyllobranchiae, 366 



Phylloceras heterophyllum, 528 



Phyllopoda, 318 



Phyllopodium, 300; 298 



Phylloxhra vastatrix, 420 



Physalia, 145 ; 147 



Phytomastigina, 41 ; 40, 54, 56 



NDEX • 635 



Pieris rapae, 403 



Pigments, Blood, see Chlorocruorin, 

 Haemocyanin, Haemoglobin ; of 

 Crustacea, 307; of Haemospori- 

 dia, 85; of Lepidoptera, 429; of 

 Phytomastigina, 41. See also 

 Chromatophores, Melanins 



Pilema, 156; 157 



Pilidiiim larva, 207; 205, 208 



Pinnate tentacles, 157, 573, 577 



Pinnulary ossicles, 580 



Pinnules, 578 



Piroplasma, 88, 465 



Placenta, of Onychophora, 285 ; of 

 Salpida, 604; of Scorpionidea, 

 452 



Placocystis, 582 



Plagiostomum lefnani, 189 



Planaria, 180 



P. alpina, 176, 183, 187 



P. lugubris, 189 



P. torva, 176 



Planorbis, 267, 495 



Planula, 131 ; i, 125 



Plasmodia, 7, 82 



Plasmodiophora, 82 



Plasmodium, 31 



Plasmodium, 86; 33, 38, 88 



P . falciparum , 88 



P. malariae, 88 



P. vivax, 87, 88 



Plasmodroma, 39 



Plasmogamy, 26 n. 



Plasmotomy, 24, 78, 93, 100 



Plastin, 19 



Plastogamy, 31 ; 26 n. 



Platyctenea, 173 



Platyhedra gossypiella, 429 ; 428 



Platyhelminthes, 174; 2, 121 



Plecoptera, 414; 393 



Pleodorina, 52 



P. calif ornica, 6 



P. illinoiensis, 6 



Pleopods, 348. See also Abdoininal 

 limbs of Crustacea 



Plesiocaris vagicollis, 400 



Pleurohrachia, 173 



P. pileus, 171 



Pleurobranchiae, 311 ; 361 



Pleuron, 295 



Pleuropodite, see Precoxa 



Plicate canals, 506 



Plumatella, 530, 536, 546 



P.fungosa, 531 



