Index 



721 



Ray, 42, 567, 568 

 Reaction, 651 



Recapitulation, law of, 647 

 Receptor, 78, 196, 209, 210 

 chemical, 214-215 

 light, 217, 218 

 sense, 211-224 

 Recessive, 298 

 Recipient, 181, 182 

 Rectal gland, 577 

 Rectum, 61, 135, 142, 144, 519, 523 

 Rectus abdominis, 60 

 Red blood cell (see Erthyrocyte) 

 Red elf, 598 

 Red spider, 516 

 Red tide, 357 

 Redi, 319 

 Redia, 411, 413 

 Reflex, 174, 196 

 arc, 195, 196, 209-210 

 center, 203 

 conditioned, 210 

 inherited, 210 

 learned, 210 

 pupillary, 217, 218 

 unconditioned, 210 

 visual, 199 

 Refractory period, 208 

 Regeneration, 253, 390 

 crayfish, 505 

 earthworm, 461 

 echinoderm, 544, 548, 549, 553 

 hydra, 390 

 planaria, 408 

 Relaxin, 242 

 Remora, 589, 590 

 Renal artery, 168 

 portal system, 66 

 pvramid, 188 

 vein, 67, 168 

 Renette cell, 425 

 Rennin, 138 

 Reproduction, 24 

 asexual, 252, 253 

 binary fission, 351 

 Reproductive system, Acanthocephala, 

 444 

 annelids, 449. 

 Cambarus, 504 

 chordates, 560 

 echinoderm, 544 

 flatworm, 403 

 frog, 72-74 

 insect, 526-527 

 mammal, 629 

 mollusc, 568 

 perch, 586 



roundworm, 425-426 

 shark, 579 

 vertebrate, 40, 252-265 



Reptilia, 601-614 

 characteristics, 602-603 

 circulatory system, 162, 165, 166 

 classification, 46, 559, 561, 567 

 digestive system, 130 

 embryology, 284, 290-291 

 endocrines, 247 

 nervous system, 197, 199 

 respiratory system, 148, 149, 151, 154 

 urinary, 185, 186 



Reservoir, 353 

 Residual air, 156 



Respiration, 62, 77, 154, 156, 229, 230 

 cellular, 146 

 external, 154 

 internal, 154 

 mechanics, 154-155 

 physiology, 153 

 rate and control, 155-156 

 tissue, 146 

 Respiratory system, bird, 616 



chordates, 560 



crayfish, 501-502 



frog, 62-63 



insect, 525 



mollusc, 468 



perch, 586 



pigments, 177 



reptile, 602 



shark, 579 



tree, 543, 551, 552, 553 



vertebrate, 40, 147-158 

 Response, 196, 203, 210, 230 

 Rete testes, 257 

 Reticular layer, 80 

 Reticulum, 132 

 Retina, 217, 218, 219, 220 

 Retinula, 502, 503 

 Retractor, 472 

 Rhabdite, 404 

 Rhabdome, 502, 503 

 Rh factor, 181, 182 

 Rhea, 623 

 Rheiformes, 623 

 Rhesus monkey, 635 

 Rheumatism, 237 

 Rhincodon, 576, 580 

 Rhineura, 607 

 Rhinoceros, 88, 630, 640 

 Rhizome, 391 



Rhizopoda (see Sarcodina), 352, 359- 



362 

 Rhynchocephalia, 603, 611-612 

 Ribbon worm (see Nemertina), 347, 



421-422 

 Riboflavin, 146 

 Ribs, 106, 107, 108, 154, 155 



