716 



INDEX 



Rectal caecum, 269, 272 



Rectum, 225, 226, 311, 312 



Rectus abdominus, 304, 386 



Red blood cell (corpuscle). See Erythrocyte 



Redia, 167, 169 



Redifferentiate, 577 



Reefs, 157 



barrier, 157 



fringing, 157 

 Reflex, 415, 416, 417 



conditioned, 460 

 Refractory period, 413 



Regeneration, 145, 166, 216, 271, 575, 576-578 

 Regurgitation, 458 

 Relaxation, muscle, 388, 389 

 Renal corpuscle, 317, 318, 525 

 Renal portal system, 316 



vein, 315 

 Renal vein, 315 

 Renin, 460 

 Reproduction. 82 



asexual, 528, 530 



bisexual, 528, 530 



unisexual, 244 

 Reproductive pressure, 103 

 Reproductive systems, crayfish, 214 



earthworm, 196, 197 



frog, 317, 318, 319 



grasshopper, 228 



lobster, 214 



man, 529-547 



planaria, 165 



tapeworm, 172, 173 

 Reptile, 319-331 



early, 320 



flying, 321 



mammal-like, 321 



modern, 324 



stem, 321 

 Reptilia, 279 

 Respiration, 80, 81, 485 



external, 485-487 



internal, 485-489 

 Respiratory tree, 275 

 Retina, 308, 398, 399, 400 

 Retinene, 401 

 Retinula, 218, 219 

 Rhabdocoelida, 166 

 Rhesus (Rh) factor, 511, 512 

 Rhinoceros, 344 

 Rhizopoda, 128-130 

 Rhodopsin. See Visual purple 

 Rhomboideus, 386 

 Rib, 376, 380 

 Riboflavin, 471 

 Richards, A. N., 525 

 Ring canal, 269, 271 

 Rhodentia, 345 

 Rods, 308 



Romelea microptera, 223 

 Romer, 294, 335 

 Root, dorsal; 416, 417 



ventral, 416, 417 

 Ross, Ronald, 131 



Sacculus, 408, 409 



Sacrum, 376, 380 



Salamander, 296-298, 392, 393, 451, 452, 476, 491 



Saliva, 454, 455 



Salts, 40 



Sand dollar, 276, 277 



Sand fly, 125, 126 



Sarcodina, 128-130 



Sarcolcmma, 74 



Sarcoplasm, 72, 73, 387 



Sartorius, 304. 386 



Scale, 369, 370, 371 



Scaphopoda, 262 



Scapula, 303, 304, 376, 380 



Scavengers, 101 



Schistosoma haematobium, 169 



Schistosome dermititis, 170 



Schizophrenia, 615 



Schleiden, 57 



Schwann, 57 



Sciatic artery, 314 



nerve, 309 

 Science, 4 



what it has done, 11 



how it works, 12 



fields, 16 

 Scientific method, 12 

 Sclerotic coat, 398, 399 

 Scolex, 171, 172 

 Scorpion, 248, 250 

 Scrotum, 538, 540 

 Scurvy, 469, 471 

 Scyphozoa, 151 

 Sea anemone, 141, 154, 155, 156 



bat, 289, 291 



cucumber, 274, 275 



horse, 291, 292 



lily, 274, 277 



squirt, 283, 284 



urchin, 274, 275, 277 

 Seal, elephant, 343 

 Secondary sexual characteristics, 437 

 Secretin, 435, 463, 464 

 Segmentation, 79, 185 

 Semen, 560 



Semicircular canals, 307, 308, 403, 408, 409 

 Semilunar valve, 313 

 Semimembranosus, 304, 386 

 Seminal receptacle, 165, 191, 196, 197, 215 

 Seminal vesicle, 196, 197, 228, 234, 538, 540 

 Seminiferous tubules, 446, 555, 556 

 Semitendinosus, 386 

 Senescence, 84 

 ■ Sensations, 394-410 

 Sepia. See Cuttlefish 

 Serosa, 467 

 Serratus anterior, 386 

 Serum, 510 

 Setae, 186, 187, 192 

 Sex, inheritance of, 600-602 



cells. See Germ cells 



chromosome, 601 



linkage, 602, 603 

 Seymouria, 320, 321, 324 



