86 THE FLORA OF THE DAKOTA GROUP. 



upon each other near the borders, generally separated by intermediate, 

 thinner tertiaries tending to the middle of the arches of the secondaries. 



A number of the specimens of the Dakota Gronp represent leaves of 

 this kind, some, liowever, being shorter and narrower, bnt all nerved as in 

 the figure. But as the teiliaries or intermediate veins are generally obso- 

 lete, the secondaries appear sometimes more distant than they are observed 

 in leaves of the normal form. 



I am unable to find a character or a difference separating this species 

 from that figured and descril^ed as Launis pruiiigctua by Unger and other 

 authors, from the European Tei'tiary. The nervation is that of tlie leaves 

 in Unger's Flora v. Kimii, PI. viii. Figs. 1 and 4, Avhere the distribution of 

 the secondaries is marked, while the intermediate tertiaiies are obsolete, 

 and Fig. 7, where the secondaries appear very close like those of our figure, 

 from the interposition of somewhat shorter, less distinct tertiaries. 



The species is coimnou in tlie Miocene of Greenland. Heer has figured 

 it in Fl. Foss. Arct., vol. 6, Abth. 1, pt. 2, PI. in, Figs.8-13; also in Fl. Foss. 

 Arct, vol. 7, p. 104, PI. lxxvii. Figs. 8-13; PI. lxxviii. Figs. 1-11 ; PI. 

 Lxxxv, Fig. 5 ; PI. CI, Figs. 2-4, from the Upper Cretaceous strata of 

 Atanekerdluk, Unartok, etc. Being thus so abundantly found in the Ter- 

 tiary and Upper Cretaceous of Greenland, the presence of this specie.s is 

 not strange or anomalous in the Cenomanian of the Dakota Group. 



The leaves of this species, though of thicker texture than those of 

 Laurus plutonia, do not show the areolation as distinctly, and the seconda- 

 ries are not flexuous and curve nearer to the borders. The relation, how- 

 ever, with L. i)lidoma is very close. 



Habitat: Pipe Creek, Cloud County, Kansas. No. 4088 of the collec- 

 tion of Mr. R. D. Lacoe. 



Aktocarpidium cretaceum Ett. 

 PL L, Fig. 7. 

 Kreidefl. v. Nietlersch., p. 251, PL II, Fig. 4. 



Leaf petiolate, coriaceous, ovate, acuminate, entire or undulate; nerva- 

 tion camptodrome; primary nerve strong, percuiTcnt; attenuate at apex ; 

 secondaries, five or .six on each side, emerging at an angle of 40° to 60°, 

 well marked, distant, the inferior proximate, the lowest su))ra-basilar, 

 shorter ; tertiary nerves or branches oblique. 



This description agrees with that of the species by Ettingshausen in 

 Kreidi'flora von Xicder.sclioena, p. 2.'j1, PI. ii, Fig. 4. The liguiv given ))y 

 the German author is of a mere fragment, the lower part of a leaf only, 



