INDEX 



r,4i 



Sand dollars, 359 



Sanders, Ottys, 64 



Santonin, 341 



Sarcode, 39 



Saroodina, 270, 285 



Sarcolemma, 121 



Sa re op] asm, 121 



Sarcosporidia, 275 



Scallops, 374 



Scaphognathite, 399 



Scapliopoda, 373 



Scapula, 86 



Schistosoma haematobium, 437, 447 



Schizogony, 274 



Schizont stage, 441 



Schizopod, 413 



Schleiden, 35, 40 



Schneider, 50 



Schneiderian membrane, 184 



Schwann, 35, 40 



Sciatic plexus, 93 



Sclera, 185, 219 



Sclerite, 417 



Scolex, 324, 454 



Scorpions, 23 



Scrotum, 109, 143 



Scurvy, 175 



Scyphozoa, 308 



Sea cucumber, 23, 361 



eggs, 371 



urchin, 23, 359 



walnuts, 23 

 Secretin, 69 



Sedge-musk ox biome, 462 

 Segregation, principle of, 238 

 Self, Dr. J. Teague, 342 

 Semicircular canals, 94, 164 

 Semilunar valves, 73, 77, 126 

 Seminal receptacles, 347 



vesicle, 145, 347 

 of frog, 95 

 Seminiferous tubules, 144 

 Sense organs, development, 218 

 function of, 183 

 of frog, 93 

 of rat, 139 

 of vertebrates, 164 

 Septa, 343, 346 

 Serial homology, 399 

 Serous membrane, 132 

 Serum, 162 



and evolution, 505 



antihuman, 506 

 Setae of earthworm, 346 



penial, 340 

 Sex, inheritance of, 245 



linkage, 246 

 Sexual reproduction, development of, 61 

 Sharks, 148 

 Sheep tapeworm, 455, 456 



Shipworm, 392 

 Shrimp fisheries, 410 

 Siamese twins, 230 

 Sinanthropus pekinensis, 494 

 Sinu-auricular aperture, 76 

 Sinus venosus, 74 

 Siphon, atrial, 151 



branchial, 151 

 Siphonoglyphe, 310 

 Siphonophora, 308 

 Sipunculoidea, 24, 356 

 Size, family, 253 

 Skeleton, appendicular, 114, 159 



human, 158 

 Skull, 159 



Sleeping sickness, 280 

 Slugs, 23 

 Snails, 373, 380 

 Social relations of animals, 428 

 Sol state, 42 

 Solastar, 359 

 Somatic cells, 54 



mesoderm, 100 

 Somatoplasm, 55 

 Somites, 216 

 Sonoran zone, lower, 477 



upper, 476 

 Sparrow, English, 26 

 Spermatheca, 427 

 Spermatic cord, 145 

 Spermatids, 210, 211 

 Spermatocytes, 210, 211 

 Spermatogenesis, 210, 211 

 Spermatophores, 331 

 Spermatozoa, 55, 142, 209, 211 

 Sphaeriidae, 378 

 Sphenodon, 486 

 Spheroid colony, 277 

 Spicules, 339 

 Spinal cord, functions of, 183 



ganglion, 93 



nerves of frog, 92 

 Spiny-headed worms, 337 

 Spiracles of grasshopper, 423 

 Spiral valve, 77 

 Spireme, 50 

 Spleen of frog, 69 

 "Bponges, 22 

 Sporoblasts, 276 

 Sporocyst, 448, 449 

 Sporogony, 274 

 Sporont stage, 441 

 Sporozoa, 274 

 Sporozoites, 62, 276 

 Sporulation, 276, 291 

 Spruce-moose biome, 463 

 Stalk, optic, 219 

 Starfish, 23, 358 



reproduction, 368 

 Starling, 479 



