464 



PALEONTOLOGY OF ILLINOIS. 



GENEBA. 



21. Sclaginites , 



22. Lycopodites 



23. Stigmaria 



24. Sigillaria 



25. Syrigodendron . 



26. Lepidodendron. 



27. Lepidophloyos.. 



28. Diplothegium .. 



29. Ulodendron 



30. Megaphytum.... 



31. Caulopteris 



32. Knorria 



33. Lepidostrobus.. 



34. Lepidophyllum. 



35. Brachyphyllum 



36. Cardiocarpon... 



37. Rhabdocarpos.. 



38. Trigonocarpum 



39. Carpolithes 



40. Pinnularia 



•3 jp 



eg 





III 



e ft £. 



« jt o 





CO 



2-S* 



E d'O 





£3 



|'b 



■si 



eT§ s- 



B'l 

















ET 2 





6" 





? 



P<7" 



£ p' 



P O 



3 



2 



3 











1 



1 



1 











6 



1 



4 



4 



7 



8 



1 



2 



31 



37 



1 











2 



3 



12 



6 



8 



14 



18 



1 



1 



1 



2 



2 















1 



1 















2 



2 



2 



2 



2 



1 



1 



2 



2 



2 



3 



3 



1 











2 



3 



2 



2 



2 



4 



4 



3 



1 



2 



5 



7 















1 



1 















9 



9 















3 



3 



2 



2 



2 



7 



7 



4 



3 



3 



9 



10 



1 















1 



120 



37 



60 



219 



280 







 

 5 



19 

 1 



10 

 

 

 

 



1 



2 

 1 

 6 

 1 

 8 

 2 

 4 

 4 

 



146 



To this comparative table I will only add a few remarks. 

 The whole number of species hitherto known from all the coal 

 fields of the United States, is not much over four hundred. 



Most of the species of our American coal plants have been 

 collected in Pennsylvania, where the coal is extensively 

 worked, not only over the whole extent of the coal fields, but 

 in the different stages of the measures. 



In Illinois, on the contrary, the coal is worked at a few 

 places only, and most of the banks hitherto opened are roofed 

 either with limestone or with calcareous shales, having an 

 abundance of animal remains, but no plants. 



In some parts of the Eastern coal fields, especially in Penn- 

 sylvania and Ohio, a number of Geologists and of amateurs 

 interested in the advancement of botanical palaeontology, have 

 for many years given their attention to the collection of fossil 

 plants, and have preserved the specimens, either in private 

 cabinets or public museums. In Illinois very few persons ap- 



