INDEX 



555 



Quadrate bone, 388, 443 



Quail, 422 



Quill (see feather). 



Rabbit, 458 . 



Rachis (see feather). 



Radial symmetry, 94 



Radiolaria, 162 



Radula, 248 



Rail, 418 



Rana, 382 



Raptores, 420 



Rat, 456, 462 



Ratitas, 411 



Rattle-snake, 388 



Rays, 373 



Razor-clam, 254 



Reason, 470 



Receptaculum seminis, 233, 287 



Rectrices (see feathers), 400 



Redia, 197 



Reduction divisions, 32, 33, 34 



Reference books, 540 



Regeneration, 97 



Reintegration of parts, 85 



Relationships of animals, 488-491 



Remiges (see feathers), 400 



Renal portal circulation, 365 



Reproduction, 14; of cells, 23; asexual, 

 74; sexual, 75, 117 



Reproduction organs of — protozoa, 157; 

 porifera, I7o;coelenterata, i84;unseg- 

 mented worms, 192, 195, 197; echino- 

 derms, 21S; annulata, 234; mollusks, 

 2S3i 254; arthropods, 287 ; vertebrates, 

 345, fishes, 370; amphibia, 380; 

 reptiles, 391 ; birds, 408 ; mammals, 448 



Reproductive epithelium, s^t 53> 54 



Reptiles, 144, 385; age of, 386 



Reptilian birds, 410 



Resemblance, general and special, 121 



Respiration, 69 ; internal, 337 ; coelenter- 

 ata., 182; annulata, 231 ; echinoderms, 

 216; mollusks, 250; arthropods, 282 

 vertebrates, 337; fishes, 337; am- 

 phibians, 378; reptiles, 388; birds, 

 405, mammals, 447 



Respiratory tree, 216 



Retina, 83, 84, 356. 357 



Khamphorhynchus, 391 



Rhinoceros, 454 

 Rhinoderma, 380 

 Rhizopoda, 162 

 Rhodosiethia, 414 

 Right-left axis (see symmetry). 

 Rodentia, 451, 456 

 Rotifers, 201, 202 

 Round worms, 200 

 Rudimentary organs, 487 

 Rumen, 444 

 Ruminant, 454 

 stomach, 444 



Sacral vertebrae, 330 

 Sagittal section, 92 

 Salamander, 384 

 Salientia, 384 

 Salmo, 369 (salmon) 

 Sahelimus, 369 

 Sarcolemma, 60 

 Sauria, 393 

 Saurarae, 411 

 Scale insects, 300 

 Scales, 363 

 Scallop, 260 

 Scarabeids, 305 

 Sceloporus, 394 

 Schwann's sheath, 63 

 Sciurus, 457 

 Scolopendra, 298 

 Scorpionida, 308 

 Scyphistoma, i85 

 Scyphozoa, 186 

 Sea-cow, 453 



cucumber, 221 



lilies, 220 



squirts, 313 



urchins, 221 

 Seals, 455 

 Secretion, 17, 70 

 Sections, defined, 92 

 Segment, 279 (see metamere, somite). 

 Segmentation (see cleavage, metamer- 

 ism). 



■cavity, 38, 39 

 Segmented worms (see annelida). 

 Segregation of characters, 501 

 of germ cells 43, 

 Semi-circular canals, 355 

 Seminal vesicles, 233 



