INDEX 



585 



Pelagial, 176, 177, 223 



geographic divisions, 270 



rich and poor sections, 239 

 Pelagic, 326 



Pelagic animals, distribution of, 238 

 Pelagic biotopes, 243 

 Pelagic life compared with bent hie, 238 

 Pelagonemertes, 262 

 Pelagothuria, 224, 238, 262, 264 

 P. nutans, 231 

 Pelecanus thagus, 787 

 Penaeus, 37 



Pendulation theory, 116 

 Penguins, 101, 485 



illustrating the Bergmann principle, 

 386 

 Pentacerasler mamilutus, multiformity, 82 

 Pentaceros lincki, 207 

 Pentatomids, 402 

 Perca volgenses, 60 

 Perdicella, 88 

 Perdix perdix, 411 

 Pericoma californica, 314 

 Peridinea, experimental introduction, 9 

 Periodicity, 139 



lack of, 405 

 Periophthahnus, 42, 197, 471, 478 

 P. koelreuteri, 198 

 Peripatus, 45, 47, 51, 113 

 Periphylla, 265, 278 

 Periplaneta, 547 

 Perkins, 526 11 

 Perkins and Forel, 96 s 9 

 Perkinsiella, 552 

 Permanence of barriers, 99 

 Perodipus, 450 

 Perspiration in man, 49 

 Pervinguiere, 376 23 

 Peschel, 96 52 , 525 1 

 Pessimum in the Arctic, 513 

 Pesta, 134", 287 59 

 Peters, 22" 



Petersen, 192, 205, 221", 222 3 ^ « 

 Petersen and Jensen, 22 1 4 

 Petrels, 397 

 Petricola, 199 

 Petroeca, 389 



Pfeffer, 119 29 , 120 61 , 279, 286 39 

 Phaeodaria, 266 

 Phaethon, 486 



Phalacrocorax atriceps, 486 



P. bougainvillii, 787 



Phalangopsis angulata, 534 



Pharyngella gastrula, 235 



Phascolosoma, 267 



P. margaritaceum, 277 



P. vulgare, 190 



Pheidole megaeephala, 524 



Phillips, 442 46 



Philodina, 355 



P. roseola, 353, 374, 498 



Philomedes brenda, 241 



Pfwca barbata, 480 



P. groenlandica, 480 



P. hispida, 346 



P. siberica, 346 



Pholas, 36, 199, 200, 250 



Pholeoteras, 94 



P. euthrix, 536 



Phoxinus, 306 



P. laevis, 306 



Phrynocephalus, 466, 501 



P. axillaris, 501 



P. erythrurus, 501 



P. forsythi, 501 



P. theobaldi, 501 



Phrynosonia, 466 



Phygas, 94 



P. colasi, 536 



Phylliroe, 255, 273 



Phyllobates, 355 



Phyllomedusa, 424, 432 



Phyllosoma, 227 



Phyllosoma larva of Palinurus, 228 



Phylloxera, 116, 539, 552 



Phymaturus palluma, 501 



P/u/sa, 85, 123, 311, 363, 518 



Physeter, 122 



wide range of, 14 

 P. macrocephalus, 243 

 Physical conditions in the ocean, 150 

 Physignathus mentager, 425 

 Physiological isolation, 74, 75 

 Physophora hydrostatica, 153, 244 

 Pirn's, 143, 396, 508 

 P. brassicae, 493 

 P. callidice, 493, 495, 496 

 Pilsbury, 72 M , 96 10 ' 38 - 57 , 119 7 , 300 14 , 525 2 

 Pilsbury and Bequaert, 358 59 

 Pingunis impennis, 485 



