INDEX 



545 



Striate muscle, 60 



Strobila, 197 



Struggle for existence, 103 



Struthio, 411 



Sturgeon, 372 



Sunfish, 372 



Supplementary studies protozoa, 163; 

 porifera, 172; ccelenterata, 189; un- 

 segmented worms, 205; echinoderms, 

 220 ; annulata, 238; mollusca, 263; 

 arthropods, 309; fishes, 374; reptiles, 

 396; birds, 436; mammals, 463 



Supportive tissue (see connective) . 



Suture, 442 



Swallow-tailed butterfly, 305 



Sweat glands, 326 



Swifts, 418 



Swine, 453 



Symbiosis, 122 



Symmetry, 3, 91, 371 



Sympathetic system, 353 



Syrinx, 405, 431 



Tcenia, 197 



Tail, 361 



Tape- worn (see Tcenia), 198 



Tapir, 454 



Tarso-metatarsus, 404 



Tarsus, 272, 332 



Teeth, 442 



Teleostei, 372 



Telophase, 26 



Tent caterpillars, 303 



Teredo, 258 



Tergum, 266 



Termites, 298 



Testis, 75, 232 



Tetrabranchiata, 262 



Thread- worms, 199 



Thrips, 299 



Thrushes, 427, 430 



Thymus, 341 



Thyroid, 341 



Thysanura, 298 



Tibia, 272 



Ticks, 309 



Tiger, 454 



Tissues definition, 47; differentiation, 



41 ; classification, 48 

 Toad, 381 



Tortoises, 392 

 Tortoise-shell, 386 

 Toucans, 428 

 'Touch, 80 

 Trachea, 337 

 Tracheae, 69, 281 

 Transverse section, 91 

 Tree-toads, 383 

 Trematodes, 195 

 Trichinella, 199 

 Trichoptera, 299 

 Trivium, 212 

 Trochanter, 272 

 Trochophore, 201, 234, 254 ; 

 Troglodytidae, 430 

 Trophoblast, 447, 448 

 Tube-feet, 214 

 Tubifex, 238 

 Tunicates, 312 

 Turbellaria, 193, 194 

 Turdidae, 430 

 Turkey, 416 

 Turtles, 392 



Tympanic membrane, 354 

 Typhlosole, 230 



Ungulata, 450, 452 



Unit characters, 492 



Unio, 239, 258 



Univalent chromosomes, 33, 34, 35 



Unsegmented worms, 146, 190 



Upupa, 402 



Urea, 71, 344 



Ureter, 344, 447 



Urethra, 344, 437 



Uric acid, 71 



Urinary bladder, 344, 447 



Urodela, 383 



Uterus, 192, 345, 447 



Vagus (nerve), 352 



Variability, 101, 477, 487 



Varieties, 109 



Vas deferens, 252, 286, 344 



Veins, 71 



Veliger, 254 



Venomous snakes, 389 



Ventriculus (stomach), 280 



Vermes, 203 



Vermiform appendix (caecum), 445 



