846 



INDEX. 



PAGE 



Pigeon's milk . . .641 

 Pigments . . . .788 



Pigs 732 



Pilema 152 



Pilidium larva . . . 186 

 Pineal body .... 468 



,, in Hatteria . . 468 



,, in Iguana . . 468 

 Pinnipedia .... 755 

 Pinnotheres .... 294 



Pipa 586 



Pipe-fishes .... 553 

 Pipistrelle . . . . j6i 

 Piroplasma . . . .118 

 Pisces (see Fishes) . . 5, 508 

 Pisiform . . . .681 

 Pithecanthropus . . . 770 

 Pituitary body . . . 468 



,, Hypotheses re- 

 garding .... 468 

 Placenta, Hints of a, before 



Mammalia . 621 



, , of Mammals . . 703 

 Placentation, classification of. 710 

 Placoid scales . . 5 11 

 Plakina . . . -125 



Planaria . . . .170 

 Plankton .... 794 

 Planorbis .... 402 

 Plantigrade .... 753 

 Plants and Animals . 22-24 

 Planula larva . . . 1 50 

 Plasmodium .... 104 

 Plasticity of organisms . . 85 

 Plastron .... 594 

 Platanista .... 747 

 Platydactylus . . . 606 

 Platyhelminthes . . .170 

 Platyrrhini . . . 765, 766 

 Plecoptera .... 345 

 Plesiosauria .... 622 

 Pleura of crayfish . . . 270 

 Pleuracanthus . . . 549 

 Pleural membrane . . 689 



Pleurobranchs of crayfish . 277 

 Pleurodont teeth . . . 602 

 Pleuronectidae . . . 545 

 Pliosaurus .... 620 

 Ploughshare bone . . . 636 

 Plumularia . . . .163 



PAGE 



Pluteus larva .... 249 



Pneumatic bones . . . 650 



Pneumoderma . . . 402 



Pneumogastric nerve . . 472 



Podical plate of cockroach . 311 



Podobranchs of crayfish . 276 



Podophthalmata . . . 292 



Podura .... 322 

 Poison gland of snakes . .610 

 Polar globules . . .61 



,, ,, in earthworm . 207 



,, ,, in Vertebrates 493 



Polecat .... 755 



Polian vesicle (Holothuria) . 256 



Polychreta 

 Polycladida . 

 Polyclinum . 

 Polygordius . 

 Polymeniscous eyes 

 Polyodon 

 Polyphemus . 

 Polyplacophora 

 Polypodium . 

 Polyprotodontia . 

 Polypterus . 

 Polyspermy . 

 Polystomum . 

 Polyzoa 

 Pond snail 

 Pons Varolii . 

 Pontobdella . 

 Porcellenastei 

 Porcellio 

 Porcupine 

 Porifera 

 Porpita 

 Porpoise 

 Portal vein 



210, 219-221 



. 172 



438 



. 222 



327 



550 

 . 284 



399 

 . 144, 167 



. 722 



550 



63 

 . 178 



235, 236 



375 

 . 684 



. 232 



. 247 



. 291 



749 



. 121 



. 163 



747 

 . 689 



Portuguese man-of-war . .163 

 Portunus . . . 282, 294 

 Post-anal gut . . . 482 

 ,, caval vein . . . 643 

 Potamogale . . . 75 2 , 757 

 Pnecoces . . . -655 

 Prairie-dog .... 749 



Prawn 293 



Precaval veins . . 643 

 Preen gland of pigeon . . 629 

 Priapulidae .... 234 

 Priapulus .... 234 



