INDEX 637 



Proboscis sheath, of Buccinum, 492 ; 



of Nemertea, 205; of Rhyncho- 



bdellidae, 263 

 Probuds, 606 

 Procerebrum, 274, 305 n. 

 Procerodes lohata, 189 

 Prociliata (Opalinidae), 99 ; 21, 22, 28 

 Proctodaeum, 121; of Arthropoda, 



278; of Crustacea, 307; of tro- 



chosphere, 250 

 Proepipodites, 299; 300, 311, 317, 



320, 328 

 Progressive feeding, 434 n. 

 Proliferating region, of Syllidae, 246 ; 



of Tapeworms (neck), 199 

 Proostracum, 524 

 Propodite, 300 

 Prorodon, 100 

 P. teres, 103 



Prosobranchiata, see Streptoneura 

 Prosoma(" Cephalothorax "of Arach- 



nida), 271, 443, 449, 452, 454, 



458, 461, 465 

 Prosopyles, 112 

 Prostate glands, of Oligochaeta, 254, 



259 ; of Sepia, 522 

 Prostomium, of Annelida, 228; of 



Chaetopoda, 229, 231, 235, 238, 



251, 258; of Gephyrea, 268; of 



Hirudinea, 263 

 Protaspis larva, 288, 289 

 Proteolepas, 343 

 Protephemeroptera, 404 

 Protobranchiata, 507; 501, 504, 505 

 Protocerebrum, 274, 303 

 Protochordata, 583 

 Protoclypeastroida, 571 

 Protococcaceae, 43 

 Protoconch, 525 

 Protodonata, 404 

 Protodriliis, 261 

 P. chaetifer, 261 

 Protohymenoptera, 405 

 Protomerite, 90 

 Protomonadina, 56 

 Protoplasm of Protozoa, 7 

 Protopodite, 298; 288, 333, 340 

 Prototroch, of Cyphonautes, 535; of 



Pilidium, 207; of trochosphere, 



250 

 Protozoa, 3 ; i 

 Protozoa and Metazoa, Connection 



between, 39 

 Protura, 409 



Proventriculus, of Carcinus, 368; of 

 Earthworms, see Gizzard ; of In- 

 secta, 388; of Ga?nmarus, 359; of 

 Ligta, 355 



Pseudocolonies of Protozoa, 7 



Pseudonavicellae, 90 



Pseudopodia, 11; of Amoebina, 63, 

 64; of Foraminifera, 67, 68, 69; of 

 Heliozoa, 78 ; oiMastigamoeba, 56 ; 

 of Mycetozoa, 81 ; of Radiolaria, 71 



Pseudopodiospores, see Amoebulae 



Pseudotracheae, 436 



Pseudotransverse fission, 24; 25, 40 



Pseudovelum, 154 



Psocoptera, 415 



Pterobranchia, 585 



Pteropods, 494 



Pterostichiis ^ 401, 435 



Pterotrachea, 492 ; 490 



Pterygota, 409 



Pterygotus, 454 ; 453 



P. osiliensis, 453 



Pulex irritans, 442 



Pulmonata, 495 ; 481 



Pulvillus, 385 



Pupa, 399; 336, 431, 557 



"Pupa" of Holothuroidea, 557 



Pupae, Coarctate, 440 ; 402 ; Exarate, 

 402 ; Obtect, 402 



Puparium, 402 



Pure lines, 30 



Purpura, 489 



Pycnogonum littorale, 467 



Pygidium, 287 



Pyloric caeca, of Asteroidea, 560; of 

 Insecta, 389 



Pyloric chamber, 307 



Pyloric sac, 560 



Pyrenoids, 41 ; 50, 51 



Pyriform organ, 535 



Pyrosoma, 607; 599, 603, 604, 605 



Pyrosomatida, 604; 601 



Quadrant, 248 

 Quartan ague, 88 

 Quartettes, 248 



Rachiglossa, 489 



Radial" blood vessel", 553 ;56i, 567, 



575, 580 

 Radial fission, 24; 25, 53 

 Radial nerve, Aboral, 580; Ecto- 



neural, 554; 567, 570 

 Radial ossicles, 580 



