636 



INDEX 



Plwnularia, 142; 141 

 Pluteus, 556; 556 

 Pneumatophore, 144 

 Pneumostome, of Arachnida, 446 ; of 



Pulmonata*, 482, 496 

 Podia, see Tube feet 

 Podical plates, 386 

 Podobranchiae, 361 

 Podocoryne, 142 

 Podocyrtis schojnbiirgki, 75 

 Podophrya, 107 

 Podura aqiiatica, 409 

 Pole capsules, 93 



Polian vesicles, 560; 563, 567, 574 

 Poly cells nigra, 189 

 Polychaeta, 230; 229 

 Poly cirrus, 230 

 Polycladida, 190 

 Polyclinum, 603 

 Polydisc strobilization, 157 

 Polyembryony, of Hymenoptera, 



396 ; of Polyzoa, 535 

 Polyenergid nuclei, 20 

 Polygordius, 261 ; 248, 250, 252, 287 

 Polykrikos, 49 ; 6, 50 

 P. schwarsi, 50 

 Polymastigina, 60 

 Polyp, 129; 130, 131, 132 

 Polypide, 530 

 Polyplacophora, 474 

 Polyps, 133, 135, 136, 137, 142, 143, 



157-70 

 Polystomella, 71 ; 26, 33, 35, 63, 70, 



74 



P. crispa, 18, 73 



Polystomum, 191; 192, 193, 194 



P. integerrimum, 152 



Polythalamia, 69 ; 67, 68 



Polytoma, 50; 15, 24, 29, 35, 40, 41 



P. uvella, 18, 25 



Polytricha, 102 



Polyzoa, 530; 2 



Pomatoceros , 230; 231, 234 



P. triqueter, 238 



Pontohdella, 267 



Porcellana, 374 



Pore plate of Radiolaria, 71 



Pore-rhombs, 582 



Pores, Collar, see Collar pores; 

 Dorsal, see Dorsal pores ; of Pori- 

 fera, no; Proboscis, see Proboscis 

 pores; Water, 582. See also Mad- 

 reporite 



Porifera, no; i, 117 



Porites, 168; 169 



Porocytes, in 



Poromya, 504 



Porthetria dispar, 429 



Portuguese man-of-war, see Physalia 



Posterior aorta, of Araneida, 458; of 

 Carcifius, 370; of Helix, 484; of 

 Lamellibranchiata, 505 ; of Scor- 

 pionidea, 450; of Sepia, 51S 



Posterior interradius of Echinoidea, 

 570 



Posterolateral arms of Plutei, 556 



Posterolateral edge of Carcinus, 365 



Postsegmental region of Crustacea, 



295 

 Preantennae, 282; 272 

 Prebranchial zone, 592 

 Precheliceral segment, 443 ; 444 

 Precoxa, 298 

 Pregenital segment of Arachnida, 



443 ; 444 

 Preischiopodite (Preischium), 298, 



299, 300 

 Preoral lobe of Echinodermata, 556 

 Preoral region, of Annelida, 228 ; see 



also Prostomium; of Arthropoda, 



271; of Crustacea, 295, 296; of 



Echinodermata, see Preoral lobe; 



of Enteropneusta, see Proboscis. 



See also Presegmental region, 



Preoral somites 

 Preoral somites, of Arachnida, 443 ; 



of Arthropoda, 271 ; of Crustacea, 



296 ; of Myriapoda, 377, 379 ; of 



Onychophora, 283 

 Presegmental region of Crustacea, 



295 



Primary body cavity, see Haemocoele 



Primary embryo, 535 



Prismatic layer, of Brachiopoda, 537 ; 

 of Mollusca, 472 



Probasipodite, 298 



Proboscis, of Acarina, 462, 465 ; of 

 Bonellia, 268 ; of Buccinum, 492 ; 

 of Chaetopoda, 231; of Entero- 

 pneusta, 585; of Nemertea, 205; 

 of Pantopoda, 466, 467 ; of Rhyn- 

 chobdellidae, 263 ; of Suctorial 

 Copepoda, 334, 335, 338 



Proboscis cavity, of Balanoglossus, 

 585, 588; of Chordata, 583 



Proboscis complex of Balanoglossus, 



587 

 Proboscis pore oi Balanoglossus, 585 



