456 



INDEX TO GENERA. 



Spotidylus, 379 

 Stegodon, 85 

 Stenogyra, 393 

 Stenorhina, 141, 142 

 Stenostoma, 128 

 Strombina, 356 

 Strombus, 340, 360 

 Styliola, 331 

 Succinea, 401 

 Sus, Y3, 86 



Symborodon, 12, 76, 81, 88 

 Sympholis, 141 



Tachymenis, 159, 180 

 Tagelus, 370 

 Tantilla, 95, 143, 181 

 Tapirus, 73, 76, 78, 87 

 Teleuraspides, 148 

 Teleuraspis, 157 

 Tellina, 286, 343, 371 

 Telmatobius, 95 

 Teratosaurus, 451 

 Terebra, 340 

 Terebratula, 299, 302 

 Termes, 425 

 Tetracaulodon, 80, 85 



Thecadactylus, 119, 176 

 Thrasops, 95 

 Thylacinus, 86 

 Tillotherium, 75 

 Titanotherium, 75, 76 

 Toluca, 141 

 Tomitherium, 89 

 Tornatellina, 397 

 Tornatina, 369 

 Tortrix, 176 

 Trachytherium, 80 

 Trichecus, 74, 76, 80, 215 

 Trichonympha, 429 

 Triforis, 363 

 Trigonarca, 290 

 Trigonia, 288 

 Trimorphodon, 131 

 Trionyx, 238 

 Tritonium, 352 

 Trivia, 360 

 Trochita, 342 

 Trypheropsis, 94, 114 

 Turbonilla, 358 

 Turris, 350 



Turritella, 264, 279, 341 

 Tylostoma, 280 



Typhlops, 176 



Uintatherium, 74, 75, 88 

 TJnio, 5, 64, 68 

 TJrsus, 89 



Yasum, 854 

 Venus, 372 

 Yermetus, 363 

 Yerticaria, 165 

 Yertigo, 400 

 Yibrio, 441 

 Yitrinella, 867 

 Yoluta, 355 

 Yolutilithes, 264 

 Yolutoderma, 264 

 Yolvula, 370 



Xenodolamia, 251 

 Xenodon, 141, 157, 180 

 Xiphodolamia, 252 

 Xiphosoma, 129, 177 

 Xylophora, 364 



Ziphius, 219 



Zygobates, 247 



