92 DESCRIPTION OF SPECIES. 



CONCLUDING REMARKS. 



The Flora of the Dakota Group, as already remarked, is considered 

 as relating the formation which it represents to the Cenomanian or Middle 

 Cretaceous. In order to ascertain the validity of the relationship, and 

 also to have a clear exposition of the general characters of the vegetation 

 of the time, I have prepared the following table of the species of fossil 

 plants which have been described by authors as referable to that stage of 

 the Cretaceous. 



1st. Those from Atane, Greenland; described by Heer in the "Fl. 

 Arct.," including part ii of vol. vi, recently published. 



2d. The species known from Moletein and Quedlinburg, described by 

 the same author. 



3d. The plants found in the Quader sandstone of the Hartz and of 

 Bohemia, described or mentioned in different memoirs by Hampe, Stiehler, 

 Dunker, Goeppert, Feistmantel, Corda, etc. 



4th. The species described from Niedershcena in Saxony, by d'Ettings- 

 hausen. 



