VI CONTENTS. 



Deacription of the species — Coutinued. 

 Cryptogams — Continued. 



Pteridopbyta — Coutinued. Page. 



Sphenophyllales 173 



Sphenophy]le;B 173 



Spbenophyllum 173 



Lyoopodiales 187 



Lepidodendrea> 187 



Lepidodeudron 187 



Lepidophloios 201 



Lepidostrobus 212 



Lepidopbyllum 214 



Lepidocystis 215 



Ompbalopbloios 218 



Sigillarie;i3 230 



Subsigillariaj 230 



Eusigillarise 241 



Sigillaria 241 



An SigillariesB aut Lepidodendreai? 244 



Stigmaria 244 



Stigmarioid impression 246 



Incerta' sedis 247 



T;eniopbyIle» 247 



TiL-niopbyllum 247 



Lepidoxylou 253 



Phanerogams 257 



Gymnosperms 257 



Cordaitales 257 



Cordaiteae 257 



Cordaites ' 257 



Cordaianthus 262 



Cordaicarpon 265 



Cardiocarpon 266 



Rbabdocarpos 267 



Titanopbyllum 270 



ConiferiP 271 



Taxacea;? 271 



Dicranophyllum 271 



Animalia? 274 



PaL^oxyris 274 



Discussion of tbe flora 276 



Species reported from the Lower Coal Measures, but not included in the foregoing arrange- 

 ment 276 



Evidence of the fossil plants aa to age and equivalence of tbe terranes 281 



Synopsis of the flora 281 



General range of the Missouri flora in tbe Coal Measures of the United States 282 



Stratigrapbic range of species having a restricted vertical distribution 285 



Probable stage of the lower coals of Missouri in eastern sections 287 



Temporary obstacles to accuracy in correlation 290 



Comparative position of the coals 292 



Relation of tbe Missouri flora to tbe floras of European basins 293 



Zone of tbe flora in the Coal Measures of Great Britain 293 



Zone of tbe Missouri flora in the Carboniferous basins of Continental Europe 298 



General considerations 305 



Index 457 



