INDEX 



meaum, 250-253; in pelecypods, 374; in 

 planarians, 318-320; in spone;es, 279; in 

 squid, 390; in stnrfish, 494; in vertebrates, 

 86-126 



Restitution phase, 1 12 



Retina, 31, 91, 103, 105, 167 



Rh factor, 199 



Rh substance, 164 



Rhahdws, 349 



Rhabdites, 323 



Rhabdilis, 349 



Rhabdoroel turbellarians, 417 



Rhabdocoela, 316, 324-326, 325 



Rhabdopleura, 541, 542, 544 



Rhamphorhynchus, 569 



Rhea, 578 



Rhinoceros, 580, 588; woolly, 642 



Rhizopoda, 230, 236; parasitic, 237-239; 

 shelled, 236-237 



Rhodnius, excretor\' mechanisms, 450 



Rhodopsin, 31, 107 



Rhomalea, 444 



Rhomboa;en, 270 



Rh\nchocephalia, 567, 571 



Ribbon worms, 340 



Riboflavin, 32 



Ribonucleic acid (RNA), 20, 21, 22, 28, 45 



Ribose, 28 



Ribs, 56. 92, 102 



Rickets, 31 



RNA, see Ribonucleic acid 



Robber fly, 474 



Rodentia, 580, 590 



Rodents, as herbivores, 608 



Rods, 106 



Rostellum, 335 



Rotifera, 216, 345 348; parthenogenesis in, 

 535 



Round window, 108 



Roundworms, 348 -353 



Roval jellv, 472 



SaccoolossiLu 539, 541, 542 



Sa^itla, 365, 366 



Saint-Hilairc, 648 



Salamander, 541, 564 



Salientia, 215, 217, 565, 566, 567 



Salinity, as environmental factor, 601 



Salinity variations, tolerance of, 602 



Saliva,' 48, 71, 100 



Salivary ducts, 48 



Salivary glands, 47, 48; of locust, 449 



Salmon, 559, 602 



Salpa, 550 



Salt-active compounds, 121 



Salt balance, in crayfish, 433 



Salts, as source of essential ions, 601 



Sand dollar, 486, 501, 502 



Sandia Cave, 644; Sandia man, 644 



Saprozoic nutrition, in pMs^lena, 242 



Sarcodina, 216, 229, 230 239; fossil, 230; 



skeleton, 527 

 Sargassum fish, 560 

 Scale insects, 477 

 Scallop, 375 

 Scalnpus, 584 



Scaphopoda, 216, 369, 387 

 Scaphyrhynchits, 588 

 Sceliphron, 470 

 Schulosoma, 332 

 Schizocoela, 219, 221, 368 

 Schleiden, 10, 12 

 Schwann, 10, 12 

 Science, 4, 7; method of, 4 

 Sclerites, 529 



Scleroblasts, 275, 277, 528 

 Scleroproteins, 430, 529 

 Scolex, 333, 335 

 Scorpion, 423, 480, 482 

 Scot opsin, 107 

 Scratch reflex, 98, 101 

 Screwworm fly, 476 

 Scrotum, 129 

 Scuddena, 461 

 Scuds, 440 

 Scurvv, 34 



Scypha, 272, 273, 276, 278, 282 

 Scvphistoma, 305 



Scyphomedusae, 216, 285, 304-305 

 Sea anemone, 306 

 Sea cucumlier, 486, 503, 504, 529 

 Sea fan, 308, 309, 528 

 Seahorse, 559 

 Sea lilies, 486, 507 

 Sea lions, 580, 586 

 Sea pen, 308 



Sea .scorpions, see Eurypterida 

 Sea spiders, see Pycnogonida 

 Sea squirts, 541, 545, 546 

 Sea stars, 486 

 Sea urchins, 486, 491, 500 

 Sea walnuts, 310 

 Seals, 580 



Second filial generation, 175 

 Second maturation division, 1 37 

 Second mitotic division, 137, 139, 148 

 Second polar body, 139 

 Secondary oocyte, 139 

 Secondary sex characters, 122, 208 

 Secondary somites, 401 

 Secondary spermatocyte, 137 

 Secretin, 117 

 Secretion granules, 20 

 Secretions, 60 

 Secretorv epithelium, 60 

 Sedimentary rock, 621 

 Sedentaria, 401 

 Segmentation, 71 

 Segregation, 184, 190 

 Selection, 174 



703 



