1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 23 



of Cornus, like C. Studeri Beer, of the Fl. Tert. Helv., vol. iii, PI. cv, figs. 

 18-21, or the European C. mas. Linn., species iu which the lower second- 

 aries are often more proximate toward the base; but as the upper 

 secondaries are directed toward the borders aud branching, the frag- 

 ments can not be referable to Coruus. It might be compared also to 

 species of Bhamnus, but the lowest secondaries branch and curve in 

 bows along the borders, a character which is at variance with that of 

 the secondary nervation of the leaves of that genus. 

 One specimen; Museum number, 2633. 



Ficus tenuinervis Lx. 



The specimen of Cherry Creek is better preserved than the small 

 fragment of this species in Lcsqx., Cret. aud Tert. Fl., p. 101, PI. xliv 

 fig. 4. The leaf is large, cordiform, rounded at apex, apparently obtuse 

 or obtusely pointed, largest below the middle and rounded to the sub. 

 cordate or emargiuate base. The secondaries are distant, parallel, much 

 curved, following close to the borders in simple areoles joined by strong 

 nervilles at right angles forking obliquely or at right angles at the 

 middle, subdivided again into small irregular polygonal areoles. The 

 characters of nervation, as well as the primary reticulation, is exactly 

 represented in I. c, fig. 4. But the leaf of Cherry Creek is more than 

 twice as large, 7 to 8°'" long, and as broad below the middle, with five 

 pairs of secondaries at a broad angle of divergence. 



One specimen; Museum number, 2479. 



Equisetum Homii, u. sp. 



Stems thick with branches 1£ to 2 cm in diameter, not compressed ; one 

 stem compressed 3 cm ; articulations distant; sheaths appressed, short 

 merely obtusely dentate; teeth generally obsolete aud destroyed Un- 

 gulate, connate to near the inflated apex; articulations under it or at 

 its base marked by round scars of leaves distinctly and deeply striate- 

 stems nearly smooth or obscurely striate ; diaphragm thick, often left 

 separated from the crushed stems, coriaceous. 



The largest fragment preserved of this species is U cn long- the di - 

 tance between the articulations S£ cm ; that of the branches 1£ to 2 cm 

 long, according to the size. The width of the stria;— which are flat in 

 the lower part, grooved iu the upper — is 1 to l£ mm . The sheaths seen 

 upon a fragment of specimen, the inside of which is preserved, is 2 mm 

 long, fringed with oblong and pointed short teeth. The roots are thiclc 

 lf cm iu diameter. 



Except Equisetum procerum Heer (Fl. Tert. Helv., vol. iii, p. 258 PI. 

 cxlvi, fig. 1), no species described from the Cenozoic time may be com- 

 pared to this. From E. procerum it differs merely by the sheaths being 

 longer, the teeth and stria; much narrower. The teeth of the sheaths as 

 described by Heer, are short, muticous. The fragments from Oregon 

 are apparently merely branches, at least those which have not been 

 flattened by compression, two of which are narrowed to the base and 



