RHA^MNALES. 185 



politan types. It is an important horizon marker and by itself 

 is almost sufficient to fix the age of the Raritan as Cenomanian. 

 Although the modern representation of this genus is reduced to 

 two species in Europe and northern Africa and a third in Japan, 

 it seemis to have been a mlOTe or less prominent type in the Creta- 

 ceous and Tertian- floras of the globe. In addition to the present 

 species, which has the wide range previously mentioned, eight or 

 ten additional Cretaceous species, mostly American, are know'n. 

 The Eocene, both of America and Europe, furnishes six or eight 

 species ; the Oligocene, of Europe and the Arctic regions, one or 

 two species, and the jMiocene and Pliocene two or three addi- 

 tional. The modern Old World Hiedera Helix Linne is recorded 

 from the Pleistocene (Interglacial) of England, Italy and the 

 Paris basin, and one of the Upper Miocene species appears also 

 to have survided into the Italian Pleistocene. While so abundant 

 an element in our Cretaceous floras, it is not a native plant in the 

 existing flora of North America. 



Occurrence. — Woodbridge. 



Collections. — N. Y. Botanical Garden. 



Genus CISSITES Heer. 



(Phyll. Cret. Nebr., 1866, p. 19.) 



CissiTES FORMOsus Heer. 



Cissites formosus Heer, Fl. Foss. Arct., vol. 6, ab. 2 : 85, pi. 21, 

 f. 5-8, 1882. 

 Lesq., Fl. Dakota Group, 161, pi. 21, f. 5, 1892 

 ? Hollick, Bull. Torrey Club, vol. 21 : 57, pi. 114, f. 6, 1894; 

 U. S. Geol. Surv. Mon. 50: 94, pi. S7, f- 7, 1907. 

 Newb., Fl. Amboy Clays, 107, pi. 4Y, f. 1-8, 1896. 

 Description. — "C. foliis palmatis, profunde trilobatis, lobo 

 medio basi contracto, trilobate, lobis obtusis." Heer, 1882. 



The foregoing description was based upon very fragmentary 

 material from the Atane beds of Greenland, from which, never- 

 theless, Prof. Heer reconstructed the supposed outline of the 

 perfect leaf. Judging by the specimens referred to this species 



