INDEX 



439 



Telolecithal embryos, 223; gastrulation 



in, 221; of lamprey, 222 

 Telophases, 71, 75, 76 

 Telosporidia, classified, 268 

 Temperature, an environmental factor, 



283; in environments, 294, 305 

 Tendo- Achilles, 134 

 Tendons, 27, 41 

 Tentacles, 97, 103, 106, 116, 169; of 



Bryozoa, 100; of siphonophore, 99 

 Terrestrial animals, 283; adaptations of, 



275, 276 

 Tertiary, geography of, 318; in time 



scale, 315 

 Test, 103 



Testis, 120, 128, 129, 236 

 Test process, 169 

 Testudinata, classified, 271 

 Testudinidaj, range of, 290 

 Tetrabranchia, classified, 269 

 Tetrabranchiate Cephalopoda, 330, 331 

 Tetrad, 211, 212, 253 

 Tetraxonida, classified, 269 

 Thales, 8 



Thaliacea, classified, 270 

 Thamnophis sauritus, range of, 298, 299 

 Thamnophis sauritus proximus, range of, 



296, 299 



Thamnophis sauritus sackeni, range of, 



297, 299 

 Thermotropism, 285 

 Thigmotaxis, 285 

 Thigmotropism, 285 

 Third inter-glacial stage, 336 

 Thoracic region of vertebral column, 136 

 Three-chambered heart, 125 

 Three-toed woodpecker, range of, 292 

 Thricozoa, 263 



Thrips, 181 



Throat, 63 



Thymus, 154, 226 



Thyroid gland, secretion of, 154 



Thysanoptera, 181 ; classified, 270 



Tibia, 134, 138, 139 



Tibiale, 138 



Tinged eye color in Drosophila, 344, 361 



Tissues, 93, 95; contractile, 108, 112; epi- 

 thelial, 108; growth of, influenced by 

 secretions, 154; nervous, 108, 114; 

 sustentative, 108, 112; types of, 108 



Toads, birth stages in, 203; classified, 274; 

 disposition of eggs, 198; fat body of, 

 147 



Toluol, 187 



Tongue, 117, 120, 228 



Tonsils, 226 



Tooth pattern, indication of age in horses, 

 328 



Trachea, 63, 121, 123, 228, 229; in res- 

 piration, 148 



Trachelocerca, 31 



Trachj^medusiB, classified, 269 



Tracks, fossil, 313 



Tradescantia, 61 



Transverse processes, 136 



Tree frogs, habitat of, 281 



Trematoda, classified, 269, 272 



Trematodes, 184, 186 



Triassic, 331, 332; in time scale, 315 



Triceratops, 332, 334 



Trichoptera, classified, 270 



Tricladida, classified, 269 



Triclad turbellarian, figure of, 118 



Trilophodon, 319, 321, 322 



Tripalmitin, 52 



True solutions, 46 



Truncate wing in Drosophila, 345 



Trypsin, 56, 145, 146 



Trypsinogen, 145, 146 



Tryptic enzymes, 56 



Tubular glands. 111 



Tubulidentata, classified, 271 



Tunicata, 100, 101 ; classified, 270, 273 



Tunicates, classified, 273; hermaphrodi- 

 tism in, 190 



Turbellaria, 172; classified, 269, 272; 

 nervous system of, 139 



Turbellarians, 184 



Turkestan, 329 



Turtles, aquatic, disposition of eggs, 198; 

 classified, 274; range of, 290 



Tusks, in elephant, 320; of Mastodon, 

 322; of Trilophodon, 321, 322 



Tympanum, 227 



Tyndall, John, 167 



Type, in classification, 265 



Types of tissues, 108 



Types of vertebrae, figure of, 137 



Typhlosole, 117 



Ulna, 138, 139 



Ulnare, 138 



Ultra-microscope, 36, 41 



Umbilical cord, 195; in mammal, 196; 



in shark, 196, 197 

 Unguiculata, classified, 271 



