448 Systematic Paleontology 



of the Upper Greensand of England and with Sequoia pectinata Heer 

 of the Senonian of Germany. It is also recorded from the Gosau beds 

 of Europe and from the Upper Cretaceous of Alaska as well as from the 

 Potomafe of Virginia, the Kootanie of Montana, and the Shasta of 

 California. The specific identity of these Upper and Lower Cretaceous 

 forms may well be doubted but no clear line of demarcation can be 

 drawn between them at the present time. It is quite possible that the 

 Potomac forms are merely variants of the abundant Sequoia Beichen- 

 hachi since they fail to show the transverse rugosity (a feature of the 

 preservation merely) described by Heer, and also appear to be some- 

 what less decurrent and at times less finely pointed than the type material. 

 A variety described by Saporta from the Albian of Portugal as var. 

 lusitanica^ is scarcely to be distinguished from the Potomac specimens. 



The Potomac specimens which Professor Fontaine identified as 

 Sequoia suhulata Heer are here referred to Sequoia rigida Heer with 

 which they are obviously identical, in fact it seems probable that the 

 type material of Sequoia suhulata cannot be distinguished from this 

 species. There are differences in some of the specimens which Heer 

 has identified with his Sequoia suhulata, so that it seems best not to 

 unite the two species at the present time. 



Occurrence. — Patuxent Formation. Near Potomac Eun, near Tele- 

 graph Station (Lorton), Virginia; Springfield, Prince George's County, 

 Maryland. 



Collection. — U. S. National Museum. 



Sequoia delicatula Fontaine 



Sequoia delicatula Fontaine, 1890, Mon. U. S. Geol. Survey, vol. xv, 1889, 



p. 247, pi. cxxi, fig. 3. 

 Sequoia delicatula Berry, 1911, Proc. U. S. Natl. Mus., vol. xl, p. 310. 



Desc7'iption. — " Principal twigs slender, penultimate and ultimate 

 ones all in one plane, minute, short, closely placed, alternate and pinnate 



^ Saporta, Fl. Foss. Portugal, 1894, p. 177, pi. xxxiil, figs. 7-12. 



