OF ARKANSAS. 



315 



23. Lepidophloios irregulare, sp. nov., . 



24. Lepidophyllum brevifolium, Lsqx., . 



25. Lepidophyllum lanceolatum, Brgt., . 

 2G. Lepidophyllum, leaves of Lepidoden 



dron, 



27. Lepidophyllum majus, Brgt, . . . 



28. Neuropteris fimbriata, Lsqx., . . 



29. Neuropteris hirsuta, Lsqx., . . . 



30. Neuropteris tenuifolia, Brgt., . . . 



31. Neuropteris vermicularis, Lsqx., 



32. Odontopteris intermedia, Sp. nov., . 



33. Pecopteris villosa? Brgt., .... 



34. Rhabdocarpos minutus, Sp. nov., 



35. Rhizolithes palmatifida, Sp. nov., . 



36. Sigillaria reticulata, Sp. nov., . . 



37. Sigillaria, Spec, nov., 



38. Sphenophyllum bifurcatum, Sp. nov., 



39. Sphenophyllum longifolium, Gutb.,. 



40. Sphenophyllum Schlotheimii, St., . 



41. Sphenopteris dilatata, Sp. nov., . . 



42. Sphenopteris decipieus, Lsqx., . . 



43. Sphenopteris Gutbieriana, Germ., . 



44. Sphenopteris obtusiloba, Brgt, . . 



45. Staphyllopteris stellata, Sp. nov., . 



46. Stigmaria ficoides, Brgt., .... 



47. Stigmaria irregularis, Lsqx., . . . 



48. Stigmatocanna? 



Male's 

 Coal- 

 bank. 

 u 



Lee 

 Creek. 



Jeney 

 Fr °S Lind 



Ba y° u - Prairie. 



James' 



Fork of 



Poteau. 



u 



11 





tl 



u 



a 



u 





u 



it 





a 



a 





a 





u 





u 





ti 





a 



u 



a 



u 



it, 





u 



From a view of this table, the following conclusions can be drawn. 

 That of forty-eight enumerated species, eighteen are new, and conse- 

 quently have not been found above the Millstone Grit. Two more, repre- 

 sented by broken specimens, are perhaps new also, and thus 26 to 28 

 species of the Arkansas coal have been found before in strata of coal 

 above the Conglomerate formation, at other places in the United States 

 coal-fields. I doubt not that if we had had a whole day to spend at 

 Male's coal-bank instead of an hour, we would, with the assistance of Mr. 

 Cox, have collected at least a dozen other new species. But the number 

 of old and already known species would have been greater also, since in a 

 hurried examination I could note only the most marked species which 

 were seen. Therefore the coal plants of the Male's bank may be con- 

 sidered as presenting in a fair average the proportion of old and new 

 species of plants pertaining to the coal-beds below the Millstone Grit. 

 Admitting this, I do not think that this proportion of new species of 

 plants of the Arkansas coal-measures authorizes a separation of these 

 measures from the beds above the Conglomerate; permitting the dis- 



