634 



INDEX 



Paramecium, 102 and n.; 8, 10, 11, 

 13, 16, 17, 23, 24, 29, 37, 38, 97, 

 99, 108 



P. aurelia, 3 1 



P. caudatum, 17, 29, 35 



Paramitoses, 19 



Paranehalia, 350 



Paraoesophageal (Circumoesopha- 

 geal) connectives, see Nervous 

 system 



Parapodia, of Aplysia, 494 ; of Poly- 

 chaeta, 229, 231-40 



Parasitic castration, by Isopoda, 357 ; 

 by Rhizocephala, 344 



Parasitic habits, of Acarina, 441, 445 ; 

 of Anoplura, 424; of Aphani- 

 ptera, 441 ; of Ciliata, 99, 100, 102, 

 104, 105 ; of Cirripedia, 343-7 ; of 

 Copepoda, 334-8 ; of Crustacea, 

 295; of Cyamtis, 360; of Dino- 

 flagellata, 49 ; of Diptera, 434, 435 ; 

 of Enta?noeba, 64; of Hemiptera, 

 419 ; of Hirudinea, 267 ; oiHistrio- 

 bdella, 263 ; of Hymenoptera, 434 ; 

 of Isopoda, 356-8 ; of Mallophaga, 

 423 ; of Nematoda, 214-27 ; of Pen- 

 tastomida, 469 ; oi Plasmodiophora, 

 82; of Platyhelminthes, 174, 190- 

 204; of Polymastigina, 61-3; of 

 Protozoa, 38 ; of Sporozoa, 82-95 > 

 of Trypanosomidae, 56-9 



Parazoa, see Porifera 



Parenchyma, 181; 174, 191, 198 



Parenchymatous tissue, see Paren- 

 chyma 



Parthenogenesis, of Crustacea*, 314, 

 324,329,331,419; oflnsecta, 394, 

 419, 424; of Protozoa, 28; of 

 Rotifera, 213 



Parthenogonidia, 53 



Patella, 490; 473, 478, 480, 488, 489 



P. coerulea, 473 



Peachia, 164; 165 



Pecten, 5og; 504, 507, 510, 523 



P. tnaximus, 509, 509 



P. opercularis, 509 



P. tenuicostatiis , 510 



Pectines, 450, 453 



Pectinibranchiata, see Monotocardia 



Pedal cords of Amphineura, 474 



Pedalioji, 213 



Pedicellariae, 550; Crossed, 558; of 

 Echinoidea, 566 ; Gemmiform, 

 566, 566; Ophiocephalous, 566, 



566; of Asteroidea, 558; of Echi- 

 nodermata, 566; Tridactyle, 566, 

 566; Trifoliate, 566, 566; Un- 

 crossed, of Asteroidea, 558 



Pedicellina, 536 



Pedicidiis hiimanus, 424 ; 423 



Pedipalpi, 442, 467 



Pedipalps, 442, 448, 449, 452, 458, 

 460, 461, 462 



Peduncle, see Stalk 



Pelagia, 157 



Pelagothuria, 577 ; 576 



Pelagothurida, 577 



Pellicle, 8 ; 44, 98, 99 



Pelmatozoa, 582; 581 



Pelornyxa, 65 



P. pal us tr is, 66 



Pen of Loligo, 525 



Penaeidea, 362 



Penaeus, 312, 316, 372 



Penis, see Generative organs 



Pennaria, 142 ; 141 



Pennatula, 161, 162 



Pennatulacea, 161 



Pentacrinus, 582 



Pentastomida, 469 ; 467 



Pentremites , 582 



Peptonephridia, 256 



Peracarida, 352; 300, 349 



Peraneftia, 48; 12, 15, 16, 41 



P. trichophoriim, 47 



Perforate shells, 69 



Peribranchial cavities, 595 



Pericardial sinus, see Pericardium 



Pericardium, of Arthropoda, 279 ; of 

 Cephalopoda, 518; of Ciona, 596, 

 598 ; of Crustacea, 3 1 1 ; of Entero- 

 pneusta, 588; of Insecta, 391; of 

 Mollusca, 470 ; of Snail, 482 



Perichaetine, 254 



Perihaemal coelom of Enteropneu- 

 sta, 585 



Perihaemal system of Echinoder- 

 mata*, 550; 561, 563, 567, 580 



Periostracum, of Brachiopoda, 537 ; 

 of Mollusca, 472 



Peripatiis, 281 ; 121 n., 270, 277, 283, 

 284, 285, 467, 468 



P. capensis, 282, 283, 285, 286 



P. edwardsi, 283 



Peripharyngeal band, 592 



Periplaneta, 409 



Peripneustic larva, 439 



Periproct, 564 



