504 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



base ; luargius strongly lobed by tlie couliuent pinuules, 1 centimeter 

 wide by 5 ceutimeters long- ; upper pinnules crowded, conical in out- 

 line, gently curved upward, with waved or lobate margins; pinnules 

 united by one-third of their length, oblong, obtuse ; basal ones on lower 

 side round, on the upi)er side flabellate, both attached by all their 

 lower margin to the rachis of the frond ; nervation strong and wavy, 

 consisting of one many-branched nerve stem in each pinnule, each 

 branch once or twice forked ; fructification unknown. 



Formation and locality. — Eocene Tertiary strata, Grreen River, Wyo- 

 ming. Collected by Dr. C. A. White. 



7. Sequoia spinosa, n. sp. 



Branches slender, foliage open, rigid f leaves narrow, acute (acicular), 

 arched upward, appressed or spreading ; spirally divergent ; staminate 

 flowers in slender terminal aments 2 inches long, two lines wide, anthers 

 few, under peltate connective scales ; cones ovate or subcylindrical, 

 composed of rhomboidal or square peltate scales. 



Formation and locality. — Cook's Inlet, Alaska. Collected by Captain 

 Howard, U. S. K. 



8. Sabal Powellii, n. sp. 



Leaves of medium size, 4 or 5 feet in diameter, petiole smooth, un- 

 armed, terminating above in a rounded or angular area, from which the 

 folds diverge; beneath concavely narrowing to form a spike 3 to 4 

 inches in length; rays about fifty, radiating from the end of the petiole, 

 perhaps sixty in the entire leaf, compressed to acute wedges where they 

 issue from the petiole, strongly angled and attaining a maximum width 

 of about 1 inch ; nerves fine, about twelve stronger ones on each side 

 of the'keel, with finer intermediate ones too obscure for enumeration. 



Formation and locality. — Eocene strata. Green River Station, Wyo- 

 ming. 



9. Mannicaria Haydeni, n. sp. 



Frond large; leaves primately plicated, folds 1| centimeters in 

 width above, slightly narrowed below; flat or gently arched, smooth, 

 springing from the midrib at an angle of 25° above, 30^ below (in the 

 specimens figured) ; folds attached to the midrib obliquely by the en- 

 tire width and to each <jther by their entire length (?) ; the nervation 

 fine, uniform (?), parallel. 



Formation and locality. — Eocene strata, Green River Station, Wy- 

 oming. Collected by Dr. F. V. Haydeu. 



10. QuERCUS gracilis, n. sp. 



Leaves narrow, lanceolate, long-pointed, acute, wedge-shaped at the 

 base; margins set with remote, low, acute teeth; nervation regular and 

 fine ; nerve branches 15 to 20 on each side, curved gently upward, and 

 terminating in the marginal teeth. 



Formation and locality. — Laramie group. Point of Rocks, Wyoming. 



