32 DESCRIPTION OF SPECIES. 



Sequoia condita, Lesqx. 



Plate I, FigB. 5, 7, 9. 

 Hsyden'i "Ann. Bep.," 1874, p. 335, pi. ir, figs. 2-7. 



Branches rigid, pinnately divided; branchlets slender, filiform, oblique; leaves 

 short, oblong, thick, not pointed, narrowed to the decurring base, appressed to the 

 stem, sometimes longer linear-acuminate, curved inward, nerveless; male ament oval, 

 scaly, rhomboidal, apiculate. 



This species is not rare in the shale of the Dakota Group, but as yet 

 it has been found always imbedded into the shale and in small fragments, 

 so that its characters cannot be stated with precision. Generally the leaves 

 are lineal-oblong, acute, appressed to the stem, variable in length, some- 

 times longer, curved inward, resembling those of S. fastigiata, the medial 

 nerve being indistinct. The cone, fig. 9, found upon specimens with 

 branches of the species, is apparently an unopened fruiting catkin of this 

 species. It has a slender short pedicel covered with very small obtuse 

 scale-shaped leaves. 



Hob. — Kansas; not rare. 



GLYPTOSTROBUS, Endl. 



Glyptostrobus gracillimus, Lesqx. 

 Plate I, Figs. 6-66. 

 "U. S. Geol. Rep.," vi, p. 52, pi. ii, figs. 8, 11-11/; Hayden's "Ann. Rep.," 1874, p. 337. 



I have figured here a mere fragment which I consider referable to the 

 species, though the branch is a little thicker and the leaves ovate, some- 

 what like those of Sequoia condita, but shorter, as may be seen in com- 

 paring both figs, ha and 6a. 



The leaves of this plant and their disposition are remarkably similar 



to those of Oyparissidium gracile, Heer, "Fl. Arct.," hi, p. 74, pi. 19, fig. i, 



found at Kome and Atane. 



THUTTES, Sternb. 



Thultes crassus, sp. nov. 

 Pinnately branching; branches comparatively thick, alternate; branchlets short, 

 obtuse; leaves thick, broadly oblong, equilateral, as broad as long, closely imbricate 

 in four rows; medial nerve distinct, inflated on the back. 



Species closely allied to Thuites Meriani, Heer, "Fl. Arct.," iii, p. 73, pi. 

 xvi, figs. 17, 18, differing especially by the great thickness of its branches, 

 the leaves larger, broader, the facial and lateral of the same size. 



Eab. — Seven miles northeast of Glasco. Chs. Sternberg. 



