INDEX. 



St. Louis Limestone 260, 274 



St. Peters Sandstone 23, 115, 126 



Streptacia Whitfleldi 59C 



Synbathocrinus 324 



Synbathocrinus brevis 439 



Synbathocrinus Wachsmuthi 437 



Strotocrinus 347 



Strotocrinus asper < 351 



Strotocrinus asperimus 349 



Strotocrinus dibit at us 363 



Strotocrinus ectypus 353 



Strotocrinus liratus 355 



Strotocrinus perumbrosus 357 



Strotocrinus umbrosus 360 



Syntrielasma hemiplicata 571 



Taxocrinus Thiemei 399 



Terebratula bovidens 572 



Tiskilwa coal, analysis of 179 



Tine culture 158 



PAGE. 



AVhitt-side county, geology of 140 



AVhi tcside county, formations of 141 



AVhiteside county, alluvial deposits of 142 



Whiteside county, Coal Measures of 146 



AVhit eside county, econom. geology of 155 



AViunebago county, geology of 82 



AViuncbago county, formations of 84 



AVinnebago county, econom. geology of 90 



Zeacrinus acantbophorus 563 



Zeacrinus arboreus 534 



Zeacriuus armiger 547 



Zeacriiius asper 430 



Zeacrinus cariniferous 535 



Zeacrinus compactilis 536 



Zeacrinus concinnus 490 



Zeacrinus formosus 549 



Zeacriuus lyra 432 



Zeacrinus mucrospinus 563 



Zeacrinus scobina .-.426 



Zeacrinus serratus 4-28 



i subtuniidus 548 



