Index of Genera. 



409 



PAGE 



Solarium 315 



Solecurtus 308 



Solenopsis 397 



Sphenopteris 17 



Spirifei- 180, 399 



Spirophyton 103 



Stachyopitis 66 



Stenopteris 70 



Stiobilites 49 



Strophodonta 169 



Strophonella 169 



Tseniopteris 19, 59 



Taxites 39 



Tentaculites 245 



Teredo 309 



Tetragonites 335 



Thinnfeldia 50 



PAGE 



Titanosuchus 142 



Trigeria 178 



Trigonia 292 



Trigonoarca 288 



Trogosuchus 366 



Truncatulina 229 



Turris 325 



Turritella 317 



Typhloniscus 213 



Vaginulina 226 



Vitulina 191 



Volutilithes 325 



