310 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



described by Heer. They also appear to be somewhat less decurrent 

 and less finely pointed than the type material. A variety described 

 by Saporta from the Albian of Portugal as var. lusitanica 1 is scarcely 

 to be distinguished from the Potomac specimens. 



Occurrence. — Patuxent fokmation: Near Potomac Run, near Tele- 

 graph Station (Lorton), Virginia: Springfield, Maryland. 



Collections. — U. S. National Museum. 



SEQUOIA DELICATULA Fontaine. 



Sequoia delicatula Fontaine, Monogr. U. S. Geol. Survey, vol. 15, 1890, p. 247, 

 pi. 121, fig. 3. 



Description. — In 1890 Fontaine furnished the following description 

 of this species: 



Principal twigs slender, penultimate and ultimate ones all in one plane, minute, 

 short, closely placed, alternate and pinnate in arrangement; leaves very small, 

 narrowly linear, acute or acuminate, widest at base, decurrent, and mostly crowded; 

 midnerve slender but distinct. 



Professor Fontaine says of this species: 



This plant is a good deal like Sequoia subulata, but the leaves are proportionally 

 wider and not so falcate, while the ultimate branches are placed at more uniform 

 intervals. 



It may be doubted whether it is really distinct from the abundant 

 Sequoia reiclienbaclii, since it was extremely rare at the single Vir- 

 ginia locality from which it was originally collected and it has not 

 been met with in any of the subsequent collections. It is not espe- 

 cially well marked and is of little significance, although it has seemed 

 best to keep it distinct at the present time. 



Occurrence. — Patuxent formation: Near Dutch Gap, Virginia. 



Collections. — U. S. National Museum. 



SEQUOIA AMBIGUA Heer. 



Sequoia ambiqua Heer, Flora Foss. Arct., vol. 3, pt. 2, 1874, pp. 78, 91, pi. 21, 



figs. 1-11; pi. 25, fig. 5; vol. 6, pt. 2, 1882, pp. 17, 52, pi. 1, fig. 3.— Fontaine, 



Monogr. U. S. Geol. Surv., vol. 15, 1890, p. 245, pi. 118, fig. 2; pi. 120, figs. 



1-6; pi. 127, fig. 5; pi. 132. fig. 3.— Nathorst, in Felix and Lenk, Beitr. 



Geol. and Pal. Mexico, 1893, p. 51, figs. 1-3. — Fontaine, in Ward, Monogr. 



U. S. Geol. Surv., vol. 48, 1906, pp. 272, 281, 538, 555, pi. 69, fig. 6; pi. 110, 



fig. 13. 

 Sphenolepidium, recurvifolium Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1890, 



p. 258, pi. 127, fig. 2; pi. 130, figs. 2, 7. 

 Sphenolepidium denlifolium Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1890, 



p. 258, pi. 128, figs. 2-6; pi. 129, fig. 5; pi. 130, figs. 4-6, 10.— Fontaine, in 



Ward, Monogr. U. S. Geol. Surv., vol. 48, 1906, pp. 484, 528, 538, 546, 555. 

 Sequoia gracilis Fontaine, in Ward, 19th Ann. Rept. U. S. Geol. Surv., pt. 2, 



1899, p. 675, pi. 166, fig. 2 (not Heer). 

 Arthrotaxopsis expansa Fontaine, in Ward, Monogr. U. S. Geol. Surv., vol. 48, 



1906, pp. 533, 535, 538, 555, 573, pi. 109, figs. 12, 13 (not pp. 504, 520, 546, 547, 



571), 



i Saporta, Flora foss. Portugal, 1894, p. 177, pi. 33, figs. 7-12. 



