GEOLOaiCAL SUEVEY OF THE TEEEITORIES. 285 



10 around the articulations. These tubercles, joined to each other like 

 string's of beads, radiating from the rhizoma, are slightly more elongated 

 outside, abruptly rounded or more inflated inward, regularly and nar- 

 rowly striated as well as the rhizomas, but scarcely, if at all, wrinkled. 

 At a distance from the point of connection to the rhizoma they become 

 more elongated, passing here and there to mere cylindrical filaments or 

 rootlets, which appear to divide in radicles. The point of union of these 

 tubercles, either to each other or to the rhizoma. is marked by com- 

 paratively large scars, (5 millimeters wide,) representing a double ring 

 with a central point. This fine species, known as yet only from its rhi- 

 zoma and its division;3, resembles ^giw'se^Mm areticum, Heer, (Fl. Arc, 2, 

 p. 31, PI. i. Fig. 2,) from Spitzbergen, and still more, at least by the form 

 of the tubercles IJ. Farlatori, Heer, as figured by linger, in Sill., PL i, 

 Fig. 5, differing, however, from both by the broader, regularly striated 

 rhizoma, not inflated at the articulations, and by the form and size of 

 the tubercles. No other fragments referable to any species of Eqiiisetum 

 have been preserved in the shales of this locality. 



Taxodium Tinajorum, (?) Heer. The specimen has two branchlets 

 of Taxodium^ parallel to each other, apparently divisions of the same 

 branch. Onebears long, crowded, linear leaves like those of this species, 

 as figured in Heer's Fl. Arc, 2, p. 22, PI. i, Fig. 3, from Alaska; the 

 other has more distant and broader leaves, somewhat enlarged in the 

 middle, or narrowing at the base like those of Taxites OlriM, Heer, loc. 

 cit, PI. i. Fig. 8. The substance of the leaves is, in both fragments, of 

 the same thickness, the surface smooth or shining, the branches com- 

 paratively thick and flat. In the upper part of the fragment compared 

 to the last species of Heer, the leaves become longer from the base up- 

 ward, as in the figure of T. OlriM ; our specimen, therefore, appearing 

 to represent both species. 



Pheagmites OENiNaENSis, Al. Br. The shales of this locality are 

 covered by a quantity of much- divided roots and rootlets, with thread- 

 like branches of the same form as those figured by Etting., Flor. Bil., 

 PI. iv, Fig. 7 6. With them are mixed fragments of rhizomas, of stems 

 and of leaves of the same species, which are well characterized by their 

 nervation, as marked in Heer's Fl. Ter. Helv., PI. xxiv, Fig. 5 b, 

 enlarged. 



Po ACITES L JEVIS, Heer. As rem arked in Dr. Hay den's Eeport for 1870, 

 p. 385, this species is rei)resented by many fragments of the culm and 

 of the leaves, identical in characters with the author's description and 

 figures in Fl. Tert. Helv., PL xxv, Fig. 10 a, h, c, and PL xxvi, Fig. 7 a. 

 The culm is about 7 millimeters wide, nearly smooth, with close undis- 

 tinct strise ; the leaves, slightly narrower, are marked by about 10 more 

 distinct smooth lines. 



Cypeeus (!) Beaunianus, (?) Heer., (Fl.Tert. Helv., p. 72, PL xxii,Fig. 

 6.) There is scarcely any doubt on the identity of this species, repre- 

 sented like the former by numerous though small fragments. The stems 

 are generally small. One of them bears attached to its curved base or 

 rhizoma, some oval tubercles with round small scars like those of Fig. 

 6, PL xxii, of Heer's loc. cit. 



Cy'PEEITES Deucalionis, Heer. Mentioned in Dr. Hayden's Eeport 

 for 1870, p. 384, with fragments of leaf of a Sadal referable to iS. major, (?) 

 Ung. 



Spaeganium, (!) species. Part of a dichotomous stem, IJ centimeters 

 wide, with the branches half as broad, distinctly marked lengthwise by 

 regular thin veins, separated by three undistinct very thin veinlets, and 

 marked crosswise by obscure less regular lines, indicating the internal 



