no. 1821. REVISION OF POTOMAC PLANTS— BERRY. 293 



Virginia. Aeundel formation: Bay View, Arlington, Maryland. 

 Patapsco formation: Federal Hill (Baltimore), Vinegar Hill, Mary- 

 land ; near Brooke, 72 milepost, Mount Vernon, Hell Hole, Virginia. 

 Collections. — U. S. National Museum, Johns Hopkins University. 



SPHENOLEPIS STERNBERGIANA (Dunker) Schenk. 



Musettes sternbergianus Dunker, Monogr. Norddeutsch Weald. -bild., 1846, p. 20, 

 pi. 7, fig. 10. 



Juniperites sternbergianus Brongniart, Tableau, 1849, p. 108. 



Araucarites dunlceri Ettingshausen (part), Abhandl. k. k. geol. Reichs. vol. 1, 

 1851, p. 27, pi. 2. figs. 2, 3, 7, 8. 



Araucarites curvifolius Ettingshausen, Abhandl. k. k. geol. Reichs., vol. 1, 1851, 

 p. 28, pi. 2, figs. 11, 13, 14, 17-21. 



Widdringtonites dunheri Schimper, Pal. Veget., vol. 2, 1870, p. 329. 



Widdringtonites curvifolius Schimper, Pal. Veget., vol. 2, 1870, p. 329. 



Sphenolepis sternbergiana Schenk, Paleont. vol. 19, 1871, p. 243, pi. 37, figs. 3, 4; 

 pi. 38, figs. 3-13.— Schimper, Pal. Veget., vol. 3, 1874, p. 575, Atlas, pi. 110, 

 fig. 27.— Ho-sius and v. d. Marck, Paleont., vol. 26, 1885, p. 215, pi. 44, figs 

 206-208. 



Sphenolepidium sternbergianum Heer, Contrib. Flora foss. Port., 1881, p. 19, 

 pi. 13, figs, la, 2-8; pi. 14.— Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 

 1890, p. 261, pi. 121, figs. 8, 10, 11; pi. 130, fig. 9.— Saporta, Flora foss. 

 Port., 1894, pp. 114, 139, 193, pi. 22, figs. 1, 2; pi. 27, fig. 14; pi. 33, fig. 13.— 

 Seward, Wealden Fl., pt. 2, 1895, p. 205, pi. 16, figs. 4-6.— Fontaine, in 

 Ward, Monogr. TJ. S. Geol. Surv., vol. 48, 1906, p. 264, pi. 169, fig. 7 — 

 Knowlton in Diller, Bull. Geol. Soc. Amer., vol. 19, 190S, p. 3S6.— Ward, 

 15th Ann. Rept. U. S. Geol. Surv., 1895, p. 359, pi. 3, fig. 1. 

 Sphenolepidium sternbergianum densifolium Fontaine, Monogr. U. S. Geol. Surv., 

 vol. 15, 1890, p. 261, pi. 118, fig. 7; pi. 121, figs. 5, 7, 9; pi. 125, fig. 2; pi. 129, 

 fig. 3; pi. 130, fig. 1; pi. 131, figs. 1, 3; pi. 132, fig. 4.— Fontaine, Proc U. S. 

 Nat. Mus., vol. 16, 1893, p. 268, pi. 36, fig. 10.— Fontaine in Ward, Monogr. 

 U. S. Geol. Surv., vol. 48, 1906, pp. 480, 481, 484, 486, 491, 507, 511, 515, 524, 

 528, 544, 545, 555, 573, pi. 109, figs. 8, 9; pi. 112, figs. 1, 10 (not fig. 11); pi. 

 115, fig. 1. 



Sequoia gracilis Heer, Flora foss. Arct., vol. 3, pt. 2, 1873, p. 80, pi. 18, fig. 1c; 

 pi. 22, figs. 1-10.— Fontaine, Monogr. TJ. S. Geol. Surv., vol. 15, 1890 (not 

 1899), p. 247, pi. 126; figs. 3, 4.— Knowlton, Smiths. Misc. Coll., vol. 4, 

 pt. 1, 1907, p. 126— ? Hollick, Monogr. U. S. Geol. Surv., vol. 50, 1907, 

 p. 43, pi. 3, fig. 14. 



Description. — Branches somewhat more remote than in Sphenolepis 

 Tcurriana, with relatively shorter twigs. Leaves ovate, decurrent, 

 keeled, with a broad base and acuminate apex, often divergent and 

 falcate; in other specimens appressed. In general the leaves are much 

 more crowded and divergent than in the preceding species. Cones 

 not collected in connection with the American material except in the 

 case of some poorly preserved specimens from Mount Vernon figured 

 by Ward 1 which may be immature, although they suggest the pre- 

 ceding species rather than this one. Cones are described by Schenk 

 from the German Wealden and are also figured by Seward from the 

 English Wealden. The cones are small, oblate spheroidal in shape, 



1 Ward, 15th Ann. Rept. U. S. Geol. Surv., 1895, p. 359, pi. 3, fig. 1. 



