80 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



matter where they become mixed together and somewhat indistinct. The 

 surface is less evidently and less regularly striate than in the other form, and 

 they do not appear narrowed to their point of attachment. It may be, there- 

 fore, that these specimens, the first from Haley coal mine, the others from 

 Point of Rocks, represent two different species. The leaves of figs. 28 and 

 29 are not distinctly seen to their base or to the point of attachment to the 

 stems. The indistinctness of the specimens may account for the differences 

 remarked above. 



Habitat. — Haley coal mine, ten miles northeast of Greeley, Colorado 

 {A. C. Peak); Point of Rocks (Z>r. F. V. Hmjden). 



Sequoia acuminata, sp. nov. 

 Plate VII, Figs. 15-1(5 o. 



Branches thick, narrowly striate ; leaves thick, rigid, with a thick, distinct, middle nerve, linear- 

 lanceolate, gradually acaminate, narrowed to the decurrent base ; surface smooth. 



This species differs from the former by the proportionally narrower 

 leaves, with a very distinct middle nerve, and smooth surface; also, by the 

 stem, which is striate when decorticated, as in fig. 15, or naked and without 

 scars, fig. 16. These differences may not be considered important enough 

 to authorize specific distinction. The general appearance of the fragments 

 representing both forms is, however, different; for the leaves of those ascribed 

 to this species have a smooth and polished surface, appearing more rigid than 

 those of the former, though their substance is not as thick. The average 

 size of the leaves is about the same in both forms, the leaves varying from 

 three to six centimeters long, and from two to four millimeters broad. These 

 two species have a remarkable affinity to Torreya Californica, Tor., by the 

 form, the consistence, and the disposition of their leaves. They, however, 

 differ from Torreya by the evidently decurring base slightly narrowed, while 

 in this genus they are rounded at the base to a short petiole. 



Habitat. — Black Butte, in the black shale of a lower coal than the main 

 coal, opened at a short distance north of the station. No other vegetable re- 

 mains were found in connection with these. 



Sequoia biforniis, Lesqz. 



Plate LXII, Figs. 15-18 a. 

 Sequoia biformis, Lesqx., Annual Report, 1874, p. 298. 



Stems or branches thick, irregularly pinnately divided; branchlets short, obliquely diverging; 

 leaves of two kinds, either longer, linear, obtusely pointed, or shorter and broader, lanceolate, taper- 

 pointed, and slightly, gradually narrowed to the decurrent base, generally incurved falcate, either dis- 

 tant and irregularly placed or crowded and imbricated ; stems distinctly marked by triangular or 

 lingulate-pointed scars. 



This species bears two kinds of leaves, even upon the same fragments 



