TH]'] EOCKY MOUNTAIN REGION OF CANADA. 11 



Several fragments of crushed leaves are so similar to the leaf from Suskwa River, thus 

 uamed in my former memoir, that I give them provisionally the same name. They resemble 

 L. Nebrascensis and L. Proteafolia of Lesquereux ; but suc-h leaves, so preserved, cannot 

 with certainty be determined ; and might be referred to a willow with perhaps as much 

 probability as to a lavirus. 



Collected by G-. M. D. with former species. 



The main points of interest with respect to these leaves are that they represent two 

 species and probably two genera of dicotyledonous trees or shrubs, with leaves of very 

 moderate size and such as might occur in a temperate climate, and illustrating palmate 

 and pinnate modes of venation. 



III. — Mill Creek Series. 



This is believed to be considerably higher in the Cr-etaceous than the previously men- 

 tioned series, though still within the limits of the Middle Cretaceous, and not improbably 

 older than the Dunvegan group of the Peace River District, described in my former paper. 

 It has important points of agreement with the Patoot series of Greenland, and the Dakota 

 group of the Western United States. 



1. Filices. 



Gleichenia gracilis, Heer. (Plate III. Fig. 4.) 



Heer, Kreide-flora der Arctischeu Zone, p. 98. 



" Frond small, slender, dichotomous, bipinnate ; pinnre approximate, lower spread- 

 ing, upper erect ; apex attenuate. Pinnules small, triangular, subfalcate, sori round, 1 or 

 two on bases of pinnules." 



The species thus characterized has an extensiA^e range in Greenland. 



Collected by G. M. D. and T. C. Weston' at Milk Creek. 



Gleichenia Kurriana, Heer. 



Lesquereux, Cretaceous Flora, p. 4*7. 



This species, recognized by Lesquereux in the Dakota group, seems to be represented 

 by mere fragments in Mr. Weston's collections from Mill Creek. 



DiCKSONiA MUNDA, S. N. (Plate III. Figs. 5, 5a.) 



Frond pinnate, or bipinnate ; barren pinnules with linear pointed arcuate pinnœ, nar- 

 rowed at base and crenatc at edges ; less than 1 centimetre long. Fertile pinnules narrow 

 with the marginal sori contiguous. 



This is a beautiful and well-characterized fern, but unfortunately always in small 

 fragments. 



ASPLENIUM ALBEETUM, S. N. (Plate III. Fig. »!.) 



Bipinnate ; pinnœ in upper part of frond elongate, dentate, in lower part pinuatifid 

 with pointed pinnules, united at the bases and pointing upward. Traces of linear sori on 

 the pinnules, which have few-branching veins. 



Collected by T. C. W. at Mill Creek. 



' T. C. W. in following page.s. 



