IIO SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



Locality. — Meridith mine, 3 miles southeast of Nollar's ranch and 

 6 miles southwest of Geyser, Cascade County, Montana. 



THYRSOPTERIS ELLIPTICA Fontaine 



Thyrsopteris elliptica Fontaine, Monog. U. S. Geol. Survey, No. 15, 1889, 

 p. 133, pi. xxiv, fig. 3; pi. xlvi, fig. i ; pi. 1, figs. 6, 9; pi. u, figs. 4. 6a, 

 6b; pi. uv, fig. 6; pi. lv, fig. 4; pi. lvi, figs. 6, 7; pi. lvii, fig. 6; pi. lviii, 

 figs. 2, 2a; Fontaine in Ward, Monog. U. S. Geol. Survey, No. 48, 1905 

 [1906], p. 290, pi. lxxi, figs. 12, 13. 



Locality. — Spanish Coulee, 12 miles east of Cascade, Cascade 

 County, Montana ; Meridith mine, 3 miles southeast of Nollar's 

 ranch and 6 miles southwest of Geyser, Cascade County ; cut on 

 Hazlett Creek 3 miles south of Bauer sheep ranch. 



ACROSTICHOPTERIS FIMBRIATA n. sp. 



Plate XI, Figs. 3, 3A 



Size and outline of whole frond unknown ; pinnae probably long, 

 linear, rachis exceedingly strong though possibly fleshy ; pinnules 

 alternate, rather remote, very broadly triangular or ovate in general 

 outline, decurrent down the rachis nearly or quite to the one next 

 below, exceedingly thin and delicate in texture; pinnules (at least 

 lower ones) deeply cut into about four cuneate-flabellate lobes, each 

 of which is provided with two or three strong, sharp teeth ; nervation 

 sparse, consisting of a short, strong midvein which almost imme- 

 diately splits into three or four veins which with one or two forks 

 pass to the points of the sharp teeth ; upper pinnules apparently not 

 lobed, but strongly and sharply toothed. 



This species is represented only by the single specimen figured, 

 and except for the fact that it is so strongly marked it would be 

 unwise to characterize a species on such scanty material. It is quite 

 unlike anything that has been previously reported from these beds. 



As may be seen from the figure, this is a very peculiar fern. The 

 thickness of the portion of the rachis preserved would imply that 

 the pinnae were of considerable length, whereas the pinnules are 

 obviously very thin and delicate. Their most marked character, 

 however, is the degree of lobation, the two or three lower pinnules 

 being deeply cut into three or four long wedge-shaped lobes which 

 are again cut into two or three strong, sharp teeth. The nervation 

 is very plain, though sparse, consisting of a thickened midvein which 

 extends but a short distance in the lower pinnules, where it breaks 

 up into three or four branches, each of which is usually once or 



