262 THE JOURNAL OF GEOLOGY. 



The first of these was described by Heer from the Kome 

 beds of Greenland (Gault or Urgonian), but it also occurs in the 

 Atane beds, which are correlated with the Cenomanian and have 

 been supposed to be nearly equivalent to the Dakota Group. It 

 has been found in the Kootanie deposits of British America, in a 

 supposed Neocomian deposit at Cape Lisbourne, Alaska, and in 

 the Amboy Clays at Woodbridge, New Jersey. It is also one of 

 the few ferns that have been found in the Dakota Group, where, 

 however, it is rare. Its evidence, therefore, considered by itself, 

 would be to put even this uppermost deposit in the Lower Cre- 

 taceous, but this is overcome by that of the remaining forms. 

 The specimens are the best in the collection, good and character- 

 istic, leaving no doubt on the score of identity. 



Quercus Wardiana Lx., is an exclusively Dakota form, but the 

 specimens are too imperfect to make the determination sure. 



Li?idera veniista Lx., is a characteristic Dakota species, and 

 one of the specimens leaves no doubt as to identity. 



Aralia TowneriY.-K., is also confined to the Dakota Group, but 

 the specimens, though tolerably good, do not exactly agree, the 

 lobes being too short. They most resemble the specimen figured 

 by Lesquereux in his Flora of the Dakota Group, pi. xxxi, fig. 3, 

 which he doubtfully refers to Sterculia Siiowii Lx., but which 

 does not at all resemble the type specimens of that species, and 

 probably belongs to Aralia Towneri. 



The leaf which I name Vibiirnites Eva?isa?ius'' is one of the 

 best preserved in the collection, but it differs specifically from all 

 the forms known to me. It is clearly of the type of Vibiirnites 

 crassus Lx., and V. Maso?d Lx., of the Dakota Group (Fl. Dak. 

 Gr., pp. 124, 125 ; pi. xlv), but is longer in proportion to its width 

 with a larger number of secondary nerves, which are irregularly 

 disposed, the angle differing on the two sides of the midrib, as 

 do also their number and proximity. The branching is strictly 

 dichotomous and the finer nervation is distinct. The margin is 

 only preserved near the summit, but here it is that of V. crassus. 



' For Mr. Fred. Evans, proprietor of Evans Quarry, founder and leading citizen of 

 Hot Springs, who greatly aided and facilitated the expedition. 



