INDEX 



773 



Plasmodiuin, 28* 



Platomn isfwo'r<,um, 51 



Platyhelmmthes, 221, 237": General 

 external features, 239 : Integument 

 and muscular layers, 248 : Parenchyma, 

 249 : Alimentary systems, 250, 251, 

 252 : Nervous system, 252 : Water 

 vascular system, 253 ; Reproductive 

 organs, 254, 256 : Development, 256, 

 257 



Platypoda, 684*, 7<5 



Pleopod, 500* 



P/t urobrOchiadce, 208 



Pleurobranchia, 508* 



Pleuron, 498* 



Pttnrophyllidia, 691 



Ploima, 304 , 305, 306 



PlnriKitftri'.t, 138 



Phi-nmtdla, 320, 322 



Pluteus, 397, 398 



Pneumatophore, 149'* 



Podobranchia, 508 



Podomere. 484* 



Podophrya, 90, 91 



Poditra, 584 



Polar body, 18*, 19 



Polian vesicle, 354*, 393 



Pollicipes, 534 



Polyarthra, 304, 305, 306 



Polycdis, 240 



Polycercus, 260 



Polychseta, 427*, 432, 433, 435, 436, 438, 

 440, 443, 444, 446, 447, 44S 



Polycladida, 237*, 240, 242, 248, 251, 252, 

 253, 255, 25G, 257 



Polydora, 447 



Polygordiidce, 462 



Polyyordius lactettx, 463 



Polygordiu* neapolitanttfy 462, 463, 464, 

 482 



Polykriko*, 73, 74 



Polymorphism, 131* 



PolynGe, 440 



Poly not exfeimata, 432 



Poly not setoxissinia, 429, 431 



Polynoidcs, 429 



Polyceca, 72, 73 



Poiyophthalmua, 438 



Polype, 118*, 119 



Polyphemus, 527 



Polyphylitic, 266 



P&lypodiuin, 155 



Polyatometv, 243 



Polyefomum, 243, 264 



Polytrochal, 445* 



Polyzoa, 313 : Example, 314, 319* : See 

 Eftoprocta and Endoprocta 



Polyzoa (Cestoda), 238* 



Pontdlina mediterranta, 554 



Pontobdella, 475, 477, 478, 479, 481 



Pore -membrane, 100* 



Pores, inhalant, 97* 



Porifera, Example, 9(5, 102* : General 

 form and mode of growth, 105 : Leading 

 modifications of structure, 107 : Skele- 

 ton, 111 : Reproduction, 112: Develop- 

 ment, 113 : Distribution, affinities, &c. , 

 115, 215 



Poromya, 647, 655, 656 



Porpita, 153, 154 



Port-hole See Cinclis 



Portuguese Man-of-War, 151 



Port tiling 541, 554 



Post-abdomen of Scorpion, 606 



PotamobiidcK, 525 



Poterion, 106 



Prte- abdomen of Scorpion, 605 



Prawns, 537, 538 



Priapulidce, 455 



Priapiilus, 456, 457 



Primary axis, iO* 



Prffneomenia, 663, 664, 667 



Pronucleus, active and stationary, 82 



Pronucleus, male and female, 18*, 19 



Pro-ostracum, 742* 



Prorocentrum, 73, 74 



Prorodon, 85, 86 



Proscolea, 237 



Prosiphon, 741* 



Prosobranchia See Streptoneura 



Prosopyle, 100*, 108 



Prostomium, 404*, 417, 432 



Protamctba, 47 



Protandrous, 285 



Protective characters, 555 



Proteid, 15* 



Proteolepas, 534 



Proterosponyia, 72, 73, 116 



Protobranchia, 646*, 648, 649, 653, 656, 

 662, 752 



Protoconch, 725*, 741 



Protodrilii*, 463, 482 



Protohydra, 137 



Protomerite, 77* 



Protomyxa, 63 



Protoplasm, 11*, 14, 15* 



Protopodite, 496*, 500 



Prototroch, 416*, 701 



Protozoa, 43 



Protozoan, 553 



Proventriculus, 593 



Px<immo<-l<'ina, 106 



Pseudo-lamellibranchia, 646*, 662 



Pseudopod, 10* 



Pseudo-scorpionida, (ill*, 613, 619, 

 621 



Pool-it*, 390 



Pteropoda, 684, 687, 688, 689, 705 



Pterotrachea, 690 



Pulex, 586 



Pulmonary sac, 691*, 692 



Pulmonata, 684*, 689, 691, 705 



Pulsellum, 705 



Pupa (of Cirripedia), 552 



