ANALYSIS OF THE DAKOTA GROUP FLORA. 245 



auriferous oTn\'el deposits of C'aliforniii, allied to A. notatd of the Laramie 

 Group, has its typical relation to A. jxipijr/fcra of Japan. 



Seven species of Aralia are still ]n-esent in the flora of North America, 

 one of them only pertaining- to that of the Pacific slope. 



From the European Tertiary thirty-two species are recorded, five of 

 which are in the flora of Sezanne, none, however, being" known in the pres- 

 ent flora of Eui'ope. 



The tribe Ilederea^ is represented in the Dakota Group by eight species 

 of Iledera and in that of Atane by four species. Two of these which I refer 

 to Hedera, H. orhlciilata and //. ovalis, are described by Heer under the name 

 of Chondrophyllum, one of them being also recorded in the Milk River 

 series of Canada. Of the two other species from Atane, one, H. lirimordlalis, 

 is recognized in the Cenomanian of Bohemia; the other, H. cimeafa, has also 

 lieen found at Patoot. Of the species of the Dakota Group, one, H: creta- 

 cea (PI. XVIII, Fig, 1), is evidently the ty^^e of //. Stwzsii Gaud., of the 

 Miocene of Tuscany, and of the living H. helix Linn., the common ivy, which 

 has been found fossil in volcanic tufa of Italy. In the flora of the Lara- 

 mie Group four species of Hedera are described by Prof Ward, two of 

 which, 11. pnrruJH' and //. minima, clearly reproduce the type of H. orhicii- 

 Idtd, and another, //. Bnineri, that of H. cretacea. In more recent forma- 

 tions, one species, H. marginata Lesq., is described from the Green River 

 Group, its relation being indicated with H.prisca Sap., of the Sezanne flora, 

 and is also typically allied to H. cretacea; another, H. auriculata Heer, is 

 from the Miocene of Alaska and the Arctic regions. 



Tlie geniis Cissites, as indicated by the name, is not precisely defined, 

 being established for leaves of peculiar form, mostly discovered in the Cen- 

 omanian, and are related ])artly to Aralia or Araliopsis, and partly to Cissus 

 and Vitis. Eleven species of Cissites are described from the Dakota Group, 

 one of them also being identified in the schists of Atane. Of two other 

 species, described by Heer in his Fl. Foss. Arct., an*!, tj'pically allied to C. 

 ■iw/eiis (PI. XIX, Fig. 2), one is apparently Tertiary, the other, C.jmiJasohoisis 

 of Puilasok, is Senonian. From tlie Upper Cretaceous of Europe nothing is 

 described except C. lacerus Sap. and Mar., Flora of Gelinden, PI. v. Fig. 7, 

 which is only a mere fragment of a leaf probably digitate, whose real form 

 and relations are unknown. In more recent formations the leaves of the 

 Anipelidacea^. become more defined and are referred to the genera Cissus and 

 Vitis. We find, therefore, in Les(j., Tert. PT, from difierent localities 

 referred now to the Laramie Group, two species of Vitis, three of Cissus, 



