INDEX 



809 



Polycladida, 248*, 251, 252, 253, 257, 

 258, 261, 262, 263, 265, 266, 268, 

 269, 270, 282, 283 



Polycolpa, 155 



Polydora, 477 . 



Polygordiidce, 491 



Polygordius lacteus, 491 



Polygordius neapolitanus, 491, 492, 493 



Polykrikos, 80, 81 



Polymorphism, 142* 



Polynesian region, 9* 



Polynoe, 457, 459, 460 



Polynoe extenuata, 459 



Polynoe setossima, 457 



Polynoidce, 457, 470 



Polyceca, 79, 80 



Polyophthalmus, 466, 470 



Polype, 130*, 149 



Polyphemus, 551, 558 



Polyphyletic group, 282* 



Poly podium, 166 



Polyspermy, 21* 



Polystomatous, 182* 



Polystomece, 253, 254 



Polystomella, 57 



Polystomum, 254, 273, 279 



Polytrochal larvse, 474* 



Polyzoa, 333*: Example, 334: Dis- 

 tinctive characters and classifica- 

 tion, 340 See Ectoprocta and Endo- 

 procta 



Polyzoa (Cestoda), 249* 



Pontellina msditerranea, 585 



Pontobdella, 504, 505, 506, 507 



Porcellana, 555 



Pore-membrane, 109, 110* 



Porifera, Example, 106 : Distinctive 

 characters and classification, 112 : 

 General form and mode of growth, 

 115 : Leading modifications of struc- 

 ture, 117 : Histology, 120 : Skeleton, 

 120 : Reproduction, 122 : Develop- 

 ment, 122 : Distribution, affinities, 

 &c., 125, 226 



Porocyte, 110*, 123 



Poromya, 678, 685, 686 



Porospora giyantea, 86 



Porpita, 164, 165 



Port-hole See Gin elides 



Portuguese Man-of-War, 163 



Portunus, 576 



Post-abdomen of Scorpion, 638 



Potamobiidce. 556* 



Potcrion, 116 



Prawns, 572, 573 



Pre-abdomen of Scorpion, 638 



Priapuloidce, 490 



Priapulus, 490 



Primary axis, 42*, 210* 



Primitive ectoderm, 304* 



Primordial eridoderm cell, 304* 



Primordial sexual cells, 304* 



Prismatic layer, 666 



Proboscis, 234 



Proglottides, 243* 



Progoneata, 598*, 602, 660, 661 



Pro -legs, 635 



Proneomenia, 694, 698 



Pronucleus, active and stationary, 93 : 



male and female, 21*, 22, 23 

 Pro-ostracum, 772* 

 Propodium, 706, 719 

 Prorocentrum, 80, 81 

 Prorodon, 96, 97 

 Proscolex, 247* 

 Prosiphon, 771* 



Prosobranchia See Streptoneura 

 Prosoma, 638 

 Prosopyle, 109, 1 10* 

 Prostate, 264, 266*, 471 

 Prostomium, 430*. 444, 460 

 Protamceba, 49 

 Protandrous, 302* 

 Protective characters, 586 

 Proteids, 16* 

 Proteolepas, 551, 565 

 Proterospongia, 79, 80, 127* 

 Proteus Animalcule, 10 

 Prothorax, 606 

 Protobranchia, 677*, 679, 686, 688, 



693, 781 



Protoconch, 755*, 771 

 Protodrilus, 491, 492, 512 

 Protohydra, 148, 149 

 Protomerite, 84, 85* 

 Protomyxa, 69 

 Protonemertini, 291* 

 Protonephridial system, 232*, 263 

 Protoplasm, 11*, 15, 16*, 17 

 Protopodite, 526*, 530, 531 

 Prototroch, 316*, 441 

 Protozoa, 45 

 Protozoaea stage, 584* 

 Protractor muscle, 666 

 Proventriculus, 609* 

 Psammoclema, 116 

 Pseudoblastopore, 216* 

 Pseudobonellia, 479, 482 

 Pseudogastrula, 125* 

 Pseudo-lamellibranchia, 678*, 680, 682, 



693, 694 



Pseudo-manubrium, 156* 

 Pseudo -metamerism, 251* 

 Pseudopod, 10*, 45*, 46*, 47 : of 



Amoeba, 10*, 46*, 47 

 Pseudo-scorpionida, 645*, 646, 652, 653 

 Psocidse, 617* 

 Psocus Jasciatus, 617 

 Psolus, 414 

 Psorosperms, 89 

 Pteropoda, 714*, 720, 721, 735 

 Pterotrachea, 721 

 Pterygota, 616* 

 Pulmonary sac, 724* 

 Pulmonata, 715*, 719, 722, 724, 726, 



728, 729, 730, 735, 736 



