INDEX 



543 



Protopodite, 267 

 Protopterus, 374 

 Proto-vertebrata, 311 

 Protozoa, 147, 149 

 Proventriculus, 280, 404 

 Pseudopodia, 154 

 Psychology, 469 

 Ptarmigan, 418 

 Pteropus, 457 



Pulp- cavity (see teeth), 442 

 Pupa, 288 (see metamorphosis). 

 Purity of gametes, 494 

 Pygopodes, 413 

 Pyloric caeca, 281, 316 



Quadrate bone, 387, 442 



Quail, 416 



Quill (see feather). 



Rabbit, 457 



Rachis (see feather). 



Radial symmetry, 93 



Radiolaria, 161 



Radula, 247 



Rail, 417 



Rana, 381 



Raptores, 419 



Rat, 455, 461 



Ratitae, 410 



Rattle-snake, 387 



Rays, 372 



Razor-clam, 253 



Receptaculum seminis, 232, 286 



Rectrices (see feathers), 399 



Redia, 196 



Reduction divisions, 32, 33, 34 



.Reference books, 530 



Regeneration, 96 



Reintegration of parts, 84 



Relationships of animals, 485 



Remiges (see feathers), 399 



Renal portal circulation, 364 



Reproduction, 14; of cells, 23; asexual, 



73; sexual, 74, 115 

 Reproduction, organs of protozoa, 



156; porifera, 169; ccelenterata, 183; 



unsegmented worms, 191, 194, 196; 



echinoderms, 217; annulata, 233 ; mol- 



lusks, 252, 253; arthropods, 286; ver- 



tebrates, 344, fishes, 369; amphibia, 

 379; reptiles, 390; birds, 407; mam- 

 mals, 447 



Reproductive epithelium, 51, 52, 53 



Reptiles, 142, 384; age of, 385 



Reptilian birds, 409 



Resemblance, general and special, 119 



Respiration, 68; internal, 336; ccelenter- 

 ata, 181 ; annulata, 230; echinoderms, 

 215; mollusks, 249; arthropods, 281; 

 vertebrates, 336; fishes, 336; am- 

 phibians, 377; reptiles, 387; birds, 

 404, mammals, 446 



Respiratory tree, 215 



Retina, 82, 83, 355, 35$ 



Rhamphorhynchus, 390 



Rhinoceros, 453 



Rhinoderma, 379 



Rhizopoda, 161 



Rhodostethia, 413 



Right-left axis (see symmetry). 



Rodentia, 450, 455 



Rotifers, 200, 201 



Round worms, 199 



Rudimentary organs, 481 



Rumen, 443 



Ruminant, 453 



Ruminant stomach, 443 



Sacral vertebrae, 329 

 Sagittal section, 91 

 Salamander, 383 

 Salmo, 368 (salmon) 

 Salvelimus, 368 

 Sarcolemma, 59 

 Saururae, 410 

 Scale insects, 299 

 Scales, 362 

 Scallop, 259 

 Scarabeids, 304 

 Sceloporus, 393 

 Schwann's sheath, 62 

 Sciurus, 456 

 Scolopendra, 297 

 Scorpionida, 307 

 Scyphistoma, 185 

 Scyphozoa, 185 

 Sea-cow, 452 

 Sea cucumber, 220 



