944 



INDEX 



Scutigera, 290 

 Scypha, 121, 122 



anatomy of, 123 

 Scyphomedusa, 137 

 Scyphozoa, class, 137 

 Sea butterflies, 258 

 cows, 634 

 cucumber, 223 

 eg-gs, 235 

 horse, 443, 451 

 lion, 629 

 robins, 454 

 slug, 241 

 walnuts, 26, 157 

 Seal, 629 



Seasonal changes, 733 

 Sebaceous glands, 616 

 Secondary sexual characters, amphibia, 



480 

 Secretin, 385, 501 

 Sedge-musk ox biome, 724 

 Segregation, 824 

 Selachii, subclass, 422 

 Self, J. Teague, 194 

 Semicircular canals, 437, 529, 608 

 Semilunar valves, 459, 510 

 Seminal groove, 200, 209 

 receptacles, 202 

 vesicle, 437, 614 



frog, 531 

 vesicles, 202 

 Sense organs of frog, 528 

 Septae, 201 

 Serial homology, 271 

 Serosa, 818 



Serous membrane, 649 

 Serpentes, 556 



suborder, 548 

 Serranidae, family, 454 

 Serum, 393 



antihuman, 884 

 Sesamoid bones, 641 

 Setae, 195, 196, 200, 201 

 Sex hormones, 675 



inheritance of, 831 

 Sexual reproduction, 408 



development of. 111 

 Shagreen, 425 



Shark, nervous system, 436 

 pilots, 454 

 skeleton, 427 

 urinogenital system, 437 

 visceral skeleton, 428 

 Shark-liver oil, 456 

 Sharks, 411, 422 

 Sheep, 630 



Rocky Mountain, 630 

 Shikepoke, 587, 588 

 Ship worm, 241 

 Shore animals of Pacific, 774 

 Shovelnose shark, 422 

 Shrews, 619 

 Shrimps, 265 

 Siamese twins, 659 

 Sibbaldus musculus, whale, 634 

 Silphidae, 324 

 Silver moth, 265, 310 

 Silverfish, 310 

 Silversides, 452 



Simia satyrus, orangutan, 637 

 Simiidae, family, 637 

 Simulium vittatum, 332 

 Sinistral, 240 

 Sinu-atrial valve, 490 

 Sinus venosus, 459 

 Siphlurus occidentalis, 321 

 Siphonaptera, order, 266, 329 



Siphonoglyphe, 141, 142. 143 

 Siphonophora, order, 136 

 Siphonophore colony, 135 

 Siphons, 222, 365 

 excurrent, 250 

 exhalant, 252 

 Siphuncle, 259 

 Sipunculoidea, 27, 194, 215 

 Siren lacertina, 473, 485 

 Sirenia, order, 634 

 Sirenidae, family, 485 

 Sistrurus, 559 

 Skates, 424 

 Skeletal system, 108 

 chicken, 609 

 fish, 464 

 frog, 517 

 phrynosoma, 574 

 Skeleton, appendicular, of fish. 465 

 of Ameiurus, 466 

 of cat, 640 

 of chicken, 610 

 of shark, 427 

 of toad. 543 

 of turile, 580, 581 

 Skin, frog, 475 



human, 376 

 Skinks, 555 

 Skull, frog, 517 

 perch, 467 

 phrynosoma, 575 

 Skunk, 638 



Sleeping sickness, African, 78 

 "Sliders," 549 

 Slimy salamander, 479 

 Sloths, 621 

 Slug, 323 

 Smelts, 448 



Sminthuridae, family, 312 

 Snail, 237 



egg masses, 247 

 Snails, 257 



pulmonate, 238 

 terrestrial, 240 

 Snake eels, 449 

 Snake, harlequin, 558 



pit vipers, 559 

 Snakes, 411, 548, 556 

 coral color bands, 558 

 lyre, 556 

 worm, 557 

 Snappers, 454 

 Snipes, 591 

 Social life, insects, 334 



relations of animals. 735 

 Sol state, 54 

 Solaster, 218 



Solenogiypha, 556 ^ 



Soles, 451 



Solitary wasp, digestive tract, 358 

 Solpugida, order, 298 

 Somatic cells, 104 



mesoderm, 53 6 

 Somatoplasm, 105 

 Somatopleure, 815, 817 

 Sonoran zone, lower, 716 

 Sorex personatus. long-tailed shrew 619 

 Sound production in mammals. 616 

 Sow bugs, 265 

 Spadefoot toad, 475 

 "Spanish fly." 341 

 Sparrows, 595 

 English, 596 

 Speotyto cunicularia, 592 



hypogaea, 593 

 Spermatid, 114, 115 

 Spermatogenesis, 113 

 Spermatogonia, 799 



