528 



MOLLUSCA BRACHIOPODA 



Pahda, 297, 298, 318-338, 340, Ul 

 Paxillus, 413 

 Pearl oysters, 100 



Peclen, 446, 450, 4^0 ; organs of touch, 

 178 ; ocelli, 191 ; flight, 192 ; nervous 

 system, 206 ; genital oritice, 242 ; liga- 

 ment, 271 

 Pectinodunta, 405 ; radula, 227 

 Pectunculus, 44^ 



Pedicularia, 75, 41^ \ radula, 224 

 Pedinogyra, 319, 322, 44^2 

 Pedipes, 18, 199, 439, 439 

 Pedum, 430 

 Pelagic Mollusca, 360 

 Pelecypotla, 7, 44^ ; development, 145 ; 

 generative organs, 145 ; branchiae, 166- 

 169 ; organs of touch, 178 ; eyes, 189 f. ; 

 foot. 201 ; nervous system, 205 

 Pella, 333 

 Pellicula, 352, 442 

 Peltoceras, 399 

 Pentadactylus, 4^3 

 Peraclis, 436 

 Pereiraea, 418 

 Perideris, 328-330, 443 

 Periodicity in breeding, 129 

 Periojihthalmus, 187 



Periostracuni, 275 



Periploma, 459 



Perisphinctes, 399 



Perissodonta, 4IS 



Perisnolax, 4^4 



Peristernia, 4^4 



Perna, 449 ; ligament, 271 



Pernostrea, 449 



Peronaeus, 358, 44'^ 



Peronia, 443 



Perrieria, 319, 44" 



Perrinia, 4OS 



Persicula, 4~5 



Persona ( = Distortio), 4^0 



Petenia, 353, 440 



Petersia^ 420 



Petraeus, 295, 331, 442 



Petricola, 454 



Phacellopleura, 403 



Phanerophthalmus, 430 



Phaneta, 4O8 



Phcmia, 312, 44I 



Pharella, 457 



Pharus, 457 



Pharynx, 210 



Phasianella, 409 



Phasis, 333 



Phenomena of distribution, 362 



Philine, 245, 428, 430 ; protective colora- 

 tion, 73 ; radula, 229, 230 



PMlomycus, 245, 318, 44O 



Philonexis, 138 



Pfuhpotamis, 304, 417 



Phoenicobius, 315, 441 



Pholadacea, 457 



Pholadidea, 457 



Pholadomya, 459 



Pholas, 245, 274, 447, 457 ; in fresh 



water, 15 

 Phos, 424 

 Photinula, 4O8 

 Phragmophora, 386 

 PhylUdiii, 434 ; breathing organs, 159 

 Phi/lUrrhoe, 360, 428, 433 

 PhtjUohranchus, 432 

 Phyllocems, 398, 398 ; suture, 396 

 Phylloteuthis, 390 



Physa, 439 ; aestivating out of water, 27 ; 

 spinning threads, 29 ; sudden appear- 

 ance, 46 ; osphradiuni, 195 ; nervous 

 system, 205 ; radula, 235 ; P. hyp- 

 norum, 23, 27 

 Pdeolus, 410 

 Pileopsis, 76 

 Pdoceras, 394 

 Pinaxia, 423 

 Pineria, 44^ 

 Pinna, 449 ; shell, 254 

 Pirmoctopus, 385 

 Pinnotheres, 62 

 Pinoceras, 398 

 Pirena, 417 

 Pireneila, 4I6 

 Pirot>sis, 4^4 

 Pirula — see Pyrula 

 Pisania, 4^4 

 Pisidium, 453; smell, 195; ova, 146; 



P. ptisillum, distribution, 282 

 Pitys, 327 

 Placobranclins, 432 

 Placostylus, 322, 323-325, 359, 442; 



radula, 233 

 Placuna, 448 ; P. placenta, used for 



windows, 101 

 PlacunanOmia, 448 



Placunopisis, 448 



Plagioptycha, 347-351, 441 



Plagioptychus, 456 



Planaxis, 417 



Planisjjira, 311, 312, 319, 441 



Planorbis, 27, 247, 439 ; monstrosity, 93 ; 

 eye, 181 ; P. albus, distribution, 282 



Platyceras, 76, 41^ 



PI at y den- is, 434 



Platypoda, 4II 



Platyschisma, 413 



Plaxiphiyr'a, 403 



Plecochihis, 44^ 



Plecotrema, 439 



Plectambonites, 505 



Plectomya, 459 



Plectopylis, 303, 305, 314, 316 ; aperture, 

 63 



Plectostylus, 358, 442 



Plectotropis, 305, 306, 310, 311, 314-318, 



441 



Plectrcphorus, 298 



