INDEX 



835 



Reptilia, 666. 713-728. 799 



ancient. 116-11^ 

 Respiration, 4, 11A-1A\, 375, 379 



bird, 232, 233, 744, 745 



crayfish, 582 



earthworm. 561 



fish, 228-233, 675 



frog, 232, 233. 702. 703 



insect. 608. 609, 618 



in invertebrates, air tubes. 228. 233 

 blood gills. 228 

 tracheal gills of mayfly, 229 



man, 233, 237, 238 



mollusk, 637 



planaria. 502 



plants. 59. 61 



reptile. 232, 233, 714, 725, 726 



salamander, 230 

 Responsiveness, 66 

 Reticulum. 183. 184 

 Retina, 321, 324, 326, 327, 328, 329, 373, 



374 

 Rh factor. 204. 382, 416, 417 

 Rhabdocoela, 507 

 Rhinoceros, 765 

 Rhinoceros beetle. 592 

 Rhodesian man, 773 

 Rhynchocephalia, 717 

 Ribbon worms, 534-538 

 Riboflavin, 171 

 Ribs, 149, 721 

 Richards. A. N.. 253 

 Rickets, 118 

 Rickettsia, 629 

 Robertson, J. D.. 559 

 Rocky Mountain spotted fever. 629 

 Rod and cone cells. 326. 328, 329, 330 

 Rodentia, 759 

 Roger of Palermo, 261 

 Rolando, L., 307 

 Root hairs, 60. 62, 63 



functions, 63 



and root pressure, 64 



system, 62 

 Rotifer, 78, 176, 227, 533, 538-543, 797 

 Roudabush. R. L., 478 

 Rouleaux formation, 202 

 Round window, 320, 321 

 Roundworms, 100, 519-532 

 Ruflini ending, 310 

 Rumen, 183, 184 

 Rutherford, 12 



Sahella pavonia, 553 



Saccule, 316, 317, 320 



Sacculus, 678 



Sagitta hexaptera. 550 



Salamander, 71, 666, 681, 683-685 



Saliva, 179 



Salivary glands. 180 

 Salveliniis fontimilis. 260 

 Sand dollar, 652, 654 

 Sarcodina, 432, 437, 441, 443 

 Scales, 126. 129, 130, 669-672 



bird, 730, 737 



snake, 716 



turtle, 725 

 Scallops, 633, 640, 642, 798 

 Scaphopoda, 631, 633, 634, 635 

 Scapula, 148, 150. 158, 673. 693, 725, 740 

 Scavengers, 580, 598 

 Sceloporus, 714 

 Schistosoma haeniatohiitm, 511 

 Sciatic nerve, 704 

 Sclerites, 600, 602, 604 

 Sclerotic coat, 327 

 Scorpion, 623 

 Scrotal sac, 340, 341 

 Scutes, 716 



Scyphozoa, 467, 468, 482 

 Sea, 3, 74 

 Sea anemones, 70. 71, 465-467, 480, 486, 



487. 797 

 Sea cucumber. 652-654, 664, 798 

 Sea hares, 644 

 Sea horse. 670, 756 

 Sea lily. 652, 653 

 Sea mouse. 567 

 Sea scorpion. 574 

 Sea star. 652, 653 

 Sea turtle, 724 

 Sea urchin, 652, 653, 654 

 Sebaceous gland, 128, 310 

 Secondary sex characters, 275, 276, 689, 



711 

 Secretin, 192, 267, 268, 696 

 Seed, 65 



Segmentation, 71, 552, 573, 574, 578, 622 

 Segregation of characters, 392 

 Self-fertihzation, 390 

 Semicircular canals, 316, 317, 320 

 Semilunar valves, 700 

 Seminal vesicle, 340, 343, 563 

 Seminiferous tubules, 341, 342, 343, 710 

 Sensation, threshold of, 309 

 Sense organs, 309-330, 708, 745, 748 

 Sensory nerve fibers, 161 

 Sepals, 54, 64 

 Sepia, 647, 648 

 Septa, 486 

 Serosa, 613 

 Serpent stars, 653 

 Serum, 197, 210, 211 

 Setae, 555, 561, 604 

 Sex determination, 396 

 Sexual coloration. 90 

 Shark. 666. 668, 669, 783 

 Shrew, common, 761 



pigmy, 69 

 Shrimp, 577, 578 



