INDEX 



603 



Ovisac, 195, 523 



Ovum, 195, 546, sss ; and see 



under various types. 

 Ovum : alecithal, centrolecithal, and 



telolecithal, 556 

 Oxidation of protoplasm, 149, 248 



X^ alaeontology, 224 



Palate, 490 



Pallial line, 384 



Pallium, see Mantle 



Paiji : Crayfish, 353 ; Mussel, 386 



Pancreas, 22, 70, 134, 204, 431, 



499 ., 



Pancreatic juice, 70 



Papillae of tongue, 180, 492 



Parachordal, 577 



Paragnatha, 356 



Paramylum, 251 



Paramcecium : structure, 262 ; 

 mode of feeding, 266 ; reproduc- 

 tion, 268 ; conjugation, 268 ; 

 practical directions, 286 



Parasite, parasitism, 33, 153, 269, 

 271 



Parietal layer of peritoneum, 26, 

 322 ; see also Mesoderm 



Parthenogenesis, 552 

 ^ Patella, 487 



Pectoral ar^h, 20, 36, 46, 426, 483 

 ,, fin or limb, see Appendages 

 ■ Pedal ganglion, 392 



Pelecypoda, 396 



Pelvic arch, 20, 36, 50, 426, 486 

 „ fin or limb, see Appendages 



Pelvis of kidney, 521 



Penis, 470, 523 



Pepsin, peptoiie, 74 



Pericardial gland, 390 



Pericardial sinus, 362 



Pericardium, 20, 386, 418, 490, 



503 

 Perichondrmm, 55 

 Perilymph, 189 

 PeriniEum, 469 



Periosteum, 55 



Periostracum, 384 



Peristaltic movements, 75 



Peristome, 275 



Peristomium, 319' 



Peritoneum, 22, 26, 322, 418, 490 



Pes, 5, SI, 468, 488 



Peyer's patches, 498 



Phalanges, 50, 51, 485, 488 



Pharynx, 17, 327, 405, 408, 42W 



495 

 Phylogeny, 223, 224 

 Phylum, 219 

 Physiology, i, 217 

 ■ Pia mater, 155 

 Pigment-cells, 128 

 Pigment-layer of retina, 185 

 Pigment-spot, 2'54 

 Pineal body, 159, 443, 513, 566 

 Pineal eye, 159, 567 

 Pinna, 467, 469, 519 

 Pisces, 2 19, 403 ; general characters' , 



of, 414 _ 

 Pithing, directions for, 103 

 Pituitary body, 159, 443, 513, 566 

 Placenta, 467, 524, 583 

 Planula, 313 , 

 Plasma, 104 



Plastic products, 249, 551 

 Platyhelminthes, 397 

 Plecfpod, 350 



Pleura, pleural membrane, 490 

 Pleurobranch, 361 

 Pleuron, Crayfish, 347 

 Podobranch, 361 

 Podomere, 349 

 Polar cells, 552, 585 

 PoUex, 48s 

 Polychseta, 341 



Polymorphic, pplyinorphism, 310 

 Polyplast, 200, 558 ;'and see under 



various types 

 Polystomum, 33 

 Pons Varolii, 513 

 Pores, dorsal, 325 

 Portal system: hepatic, 85, 440, 510;. 



renal,-85, 438 

 Post-axial and pre-axial borders of 



limb, 484, 486 , 



