KNOWLTON] KOOTAXIE PLANTS FROM GREAT FALLS, MONTANA III 



twice forked before their termination in the apex of the lobes or 

 teeth. 



There can be little doubt that this plant is correctly referred to 

 the Acrostichopteris of Fontaine, thus proving another strong bond 

 of affinity between the Kootanie and the Lower Potomac of Vir- 

 ginia. It is, for example, certainly generically similar to Acrosto- 

 chopteris parvifolia Font., 1 though it is much larger and has the teeth 

 of the lobes larger and sharper. It is also strongly suggestive of A. 

 Ruffordi Seward 2 from the Wealden of England; indeed, with a 

 larger series of specimens for comparison, it is not at all impossible 

 that they might be shown to be identical. As it is, the present species 

 appears to differ in being slightly larger, not so much cut, and the 

 lobes with stronger, sharper teeth. 



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

 6 miles southwest of Geyser, Cascade County, Montana. 



DRYOPTERIS MONTANENSIS (Fontaine) Knowlton 



Dryopteris montanensis (Fontaine) Knowlton, Bull. U. S. Geol. Survey, 



No. 152, 1898, p. 92. 

 Aspidium montanense Fontaine, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 



490, pi. lxxxii, figs. 1-3; pi. lxxxiii, figs. 2, 3, 3fl. 



Locality. — First railroad cut west of smelter on high line track, 

 north side of Missouri River at Great Falls ; same locality, but 

 slightly different bed ; Flood siding 5 miles southwest of Great Falls, 

 Montana [at or near type locality]. 



DRYOPTERIS? KOOTANIENSIS n. sp. 



Plate XI, Figs. 4, 4A 



Outline of frond unknown ; pinna? slender, linear ; pinnules small, 

 very remote, apparently alternate, oblique, strongly auricled on both 

 upper and lower side, otherwise linear, obtuse at apex, attached at 

 the slightly heart-shaped base ; midrib slender ; veins slender, rather 

 remote, apparently once forked. 



This species is represented by the single fragment figured, which 

 shows a slender rachis with only about five pinnules. These, it will 

 be observed, are very remote, and are remarkable in that they have 

 a pronounced enlargement at the base on either side, though the point 

 •of attachment is apparently in a slightly heart-shaped base. 



1 Monog. U. S. Geol. Survey, No. 15, 1889, pi. clxxi, figs. 3, 4. 



2 Cat. Mesoz. PI. Brit. Mus., Wealden Fl., pt. 1, 1894, p. 61. pi. vi, fig. 3. 



