962 



INDEX 



Pneumatic bones, 757. 

 Pneumoderma, 474. 

 Pneumogastric nerve, 545. 

 Podical plate of cockroach, 372. 

 Podobranchs of crayfish, 331. 

 Podosomata, 431. 

 Podura, 384, 407. 

 Poikilothermal, 78 r. 

 Poison gland of snakes, 706, 707. 

 Polar bodies, 70. 



in Vertebrates, 571. 



Polecat, 873. 



PoUan vesicle (Holothuria^, 308. 



— vesicles of sea-urchin, 304. 



— — ^ of starfish, 295. 

 Polycelis, 214. 

 Polychffit, free-living, 268. 

 Polychaeta, 257, 264, 266. 

 Polycladida, 206, 214. 

 Polyclinum, 514. 

 Polydora, 498. 

 Polygordius, 264, 270, 498, 



— development of, 265. 

 Polymeniscous eyes, 389. 

 Polymorphism, 170, 512. 

 Polyodon, 638. 

 Polyphemus, 340. 

 Polyplacophora, 472. 

 Polypodium, 180, 209. 

 Polyprotodontia, 839. 

 Polypterus, 632, 636, 637. 



— larva of, 637. 

 Polyspermy, 72. 

 Polystomel'la, 114, 114, 115. 

 Polystomum, 222. 

 Polyxenus, 369. 

 Polyzoa, II, 244, 286. 



Polyzoon, diagram of ectoproctous, 286. 



Pond snail, 446. 



Pons Varolii, 799. 



Pontobdella, 279. 



Porania, 292, 298. 



Porcellenaster, 298. 



Porcellio, 350. 



Porcupine, 867. 



Porifera, 13, 153. 



Porocytes, 155. 



Porpita, 205. 



Porpoise, 864. 



Portal vein, 807. 



Portuguese man-of-war, 205. 



Portunus, 337, 353- 



Post-anal gut, 558. 



— caval vein, 700. 

 Postural tension of muscle, 29. 

 Potamogale, 869, 874. 

 Potorous, 842. 



Potosia, 391. 

 Powder-down, 734. 

 Praecoces, 761. 

 Praestemum, 780, 789. 

 Prairie-dog, 867. 

 Prawn, 353. 

 Precaval veins, 700. 

 Preen gland of pigeon, 736. 

 Prepuce, 811. 



Priapulidae, 282. 



Priapulus, 282, 284. 



Primary vesicles of brain, 539. 



Primates, 882. 



Primitive groove, 717, 765. 



— streak, 717, 765. 

 Pristis, 634. 

 Pro-amnion, 718. 

 Proboscidea, 857. 

 Proboscis of Nemerteans, 234. 

 Procavia, 856. 



Processus falciformis, 552. 



Procoelous, 653. 



Proctodaeum, 558. 



Procyon, 873. 



Proechidna, 3, 776, 833, 837. 



Proglottides, 224. 



Proneomenia, 478, 478. 



Pronephros, 565. 



Prongbuck, 852. 



Propter>'gium, 595. 



Prosadenophorus, 234, 



Proscolex, 223, 225. 



Prosencephalon, 539. 



Prosimiae, 880. 



Prosobranchs, 476. 



Prosorhochmus, 234. 



Prostate gland, 811. 



Prostoma, 235. 



Prostoraium, 266. 



Protandrous, 575. 



Protective adaptation in insects, 403. 



— colouring of Insects, 403. 



of Mammals, 829. 



Proteins, 21. 



— digestion of, 30, 31. 

 Proteles, 872. 

 Proteomyxa, 130. 

 Proterosauria, 686. 

 Proterospongia, 151, 152, 166. 



— haeckelii, 151. 

 Proteus, 551, 679, 680. 



— animalcule {see Amoeba), no, 

 Protists, 23. 

 Protobranchia, 480. 

 Protocercal, 630. 

 Protodrilus, 270. 

 Protogynous, 511. 

 Protohippus, 856. 

 Protohydra, 180, 202. 

 Protomyxa, 131, 131, 303- 

 Protonemertini, 235. 

 Protoncphridia, 262. 

 Protoplasm, 36, 52, 58. 

 Protopodite of Crustaceans, 322. 

 Protopteron, 408. 

 Protopterus, 632, 641, 643, 644- 



— larva of, 643. 

 Protospongia, 164. 

 Prototheria, 3, 833. 

 Prototracheata, 361. 



ProtovertebraB = Mesoblasticsegments,r)72. 

 Protozoa, 47, 109. 



— and Disease, 145. 



— and Metazoa, 13. 142, 151. 



— classification of, 14, 129, 130. 



