558 



INDEX 



nelid worms, 193; of leech, 205; 



ascidian, 365; of mammals, 505; 



of vertebrates, 344. 

 Pliascolomyidge, 529. 

 Piiocidse, 540. 

 Phragmocone, 301. 

 Piiylogenes, 11. 

 Phylum, 7, 74, 75. 

 Physalia arethusa, 105. 

 Physiology, 12. 

 Pieris rapa;, 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. 

 Ploughshaie, 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. 

 Polychseta, 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. 

 Prpe-abdomen, of scorpions, 255. 



Pre-maxillee, 499. 



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 an^ ggg yorms, 193; of 



Balanoglossus, 3T1 ; 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. 



Proven tri cuius 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. 

 Pterylse, 462. 



