49 
Columbia by Dawson, and by Newberry and Knowlton from various 
outcrops of this age in Montana, and by the present writer from the Bull 
Head Mountain sandstone of British Columbia. 
Occurrence. Kootenay; localities CK1 (common), CN2, COl, and CPI. 
Lower Blairmore; localities CH5 and CH7. 
Genus, baieba F. Braun 
Baiera sp. 
A single fragment from the Kootenay locality DH2 appears to repre- 
sent a Baiera, although it may simply be a fragment of the abundant 
Ginkgo arctica , which, however, has not been detected at this particular 
locality. 
Genus, nageiopsis Fontaine 
Nageiopsis zamioides Fontaine 
Nageiopsis zamioides Fontaine, U.S. Geol. Surv., Mon. 15, p. 196, PI. 79, 
figs. 1-3; PL 80, figs. 1, 2, 4; PI. 81, figs. 1-6: Idem., Mon. 48, 
pp. 510, 521, 528, 545 (1906). 
Berry, Lower Cretaceous, p. 386, Pl. 62, figs. 1, 2; Pl. 63 (1911). 
This somewhat variable species includes the forms to which Fontaine 
gave the following names: Nageiopsis recurvata, deerescens, ovata, hetero - 
phylla , and microphylla. A complete synonymy will be found in the work 
by the writer cited above. The species is characterized by ovate-lanceo- 
late leaves which are proportionately shorter and wider than Nageiopsis 
angustifolia and much shorter and more rounded in outline than in Nagei- 
opsis longifolia . They are broadest toward the rounded base, and widths 
of 1*5 cms. have been observed, although they are usually narrower. 
They are very variable as to size, generally acutely tipped but sometimes 
obtuse. 
Characteristic specimens of this species occur at the Kootenay locality 
CQ4, The species is exceedingly common throughout the Potomac 
Group of the Atlantic Coastal Plain, but has not been recorded from 
outside that region except for an extremely doubtful record from the 
Knoxville beds of California. The genus Nageiopsis, like the fern genus 
Acrostichopteris, appears to be far less common in the western than in 
the eastern part, of North America during the Lower Cretaceous. It is 
possible that the detached pinnules identified as Podozamites lanceolatus 
from the Kootenay and Lower Blairmore of Alberta may represent this 
species of Nageiopsis. The two are difficult to differentiate, but the only 
conclusively determined occurrence of this species is the present one. 
Nageiopsis angustifolia Fontaine 
Nageiopsis angustifolia Fontaine, U.S. Geol. Surv., Mon. 15, p. 202, Pl. 
86, figs. 8, 9; PL 87, figs. 2-6; PL 88, figs. 1, 3, 4, 6-8; Pl. 89, fig. 2 
(1890); in Ward, 19th Ann. Kept., U.S. Geol. Surv., pt. 2, p. 684, 
PL 168, fig. 7 (1899): Idem., Mon. 48, pp. 219, 491, 516, 528, 
560, PL 117, figs. 4, 5 (1906). 
Berry, Lower Cretaceous, p. 389, Pl. 63, figs. 3, 4 (1911). 
