558 



INDEX 



nelid worms, 193; of leech, 205; 



ascidian, 365; of mammals, 505; 



of vertebrates, 344. 

 Phascolomyidae, 529. 

 Phocidae, 540. 

 Phragmocone, 301. 

 Phylogenes, n. 

 Phylum, 7, 74, 75. 

 Physalia arethusa, 105. 

 Physiology, 12. 

 Pieris rapas, 244. 

 Pig. 526, 537- 



Pigeon, domestic, structure of, 457. 

 Pigeon's milk, 483. 

 Pigment cells of molluscs, 303. 

 Pineal body, 354, 380; eye, 364, 450. 

 Pleurophyllidia, 291. 

 Ploughshare, 465. 

 Pneumatic duct, 403. 

 Pneumatophore, 105. 

 Podobranchise, 224. 

 Podomeres, 214. 

 Podophrya, 51. 



Poison apparatus of reptiles, 454. 

 Poison fang of reptiles, 447, 453, 454. 

 Poison glands, of scorpion, 255 ; 



of spider, 259 ; of reptiles, 453. 

 Poison, of reptiles, 454; immunity 



against, 454. 

 Polar bodies, 60. 

 Polian vesicles, 165. 

 Polychaeta, 199. 

 Polykrikos, 40. 

 Polyoeca, 39. 

 Polype, 90. 



Polypterus birchir, 399. 

 Polyzoa, 181. 

 Pons Varolii, 517. 

 Porcupine, 526, 541. 

 Pore, excretory, of fluke-worms, 130 ; 



of round-worms, 149. 

 Porifera, 76. 

 Porpoise, 526, 536. 

 Portuguese man-of-war, 105. 

 Post-abdomen, 255. 

 Potamobia pallipes, 213, 221. 

 Prae-abdomen, of scorpions, 255. 



| Pre-maxillae, 499. 

 j Pre-hallux, 417. 

 Premaxilla of frog, 414. 

 Prepuce of mammals, 520. 

 Pre-sphenoid, 498. 

 Presternum, 495. 

 Primates, 527, 543. 

 Pristiphorus, 387. 

 Pristis, 387. 

 Proboscis, of annelid worms, 193; of 



Balanoglossus, 311; of gastropod 



molluscs, 289, 293; of leech, 211 ; 



of nemertean worms, 145; sheath 



of, 146. 

 Process, articulating, 334; odontoid, 



464. 



Procoracoid bone of frog, 414. 

 Proglottis, 140. 

 Pro-ostracum, 301. 

 Pro-otic bones of frog, 411. 

 Propodium, 290. 

 Prorocentrum, 40. 

 Prorodon, 49. 

 Prosencephalon, 380. 

 Prosimii, 543. 

 Prosopyle, 81. 



Prostomium of annelids, 189. 

 Proterospongia, 39. 

 Proteus, 433. 

 Protobranchia, 279. 

 Protomerite, 58. 

 Protoplasm, 16. 

 Protopodite, 216. 

 Protopterus, 405. 

 Prototheria, 524. 

 Prototroch, 295. 

 Protozoa, 14. 

 Proventriculus of birds, 474, 488. 

 Pseudocoele, 515. 



Pseudopleuronectes americanus, 398. 

 Pseudopodia, 15. 

 Pteropoda, 288, 291, 296. 

 Pterygiophores, 372. 

 Pterygodia, 388. 

 Pterygoid, bones, 414, 499. 

 Pterygoid process, 498. 

 Pterylae, 462. 



