280 MESOZOK' FLORAS OF UNITED STATES. 



the Potomac Fnriiiatidii. It will he (il)sprved that w liilc indiv idiials of sonic species 

 are abundant in tlic collection, tiiey ar(> in a condition so imperfect that some iloiihts 

 must re.st on tlieir identification, and further iiivesti<j;ation may throw nuicli liglit 

 on their a<;e and allinities. There can, h<)\vev(>r. he scarcely any doiiht as to their 

 general reference to tlu' Neocomian i;ronp of the Lower Cretaceous, and to the 

 lower ))art of tlie earlier or Lower Cretaceous as held by the Canadian Cieological 

 Survey, and as recently fully illusti-aled for the ('nitcd States in ihc Hulletin of the 

 United States (ieolo<;ical Survey. 



The following list (Miihfaccs all the Kootaiiie plants thai liad heeii 

 reported prior to tlie year 1895, when I visited the (ireal Falls coal Lasiii 

 and made my collection: 



Angiopteridium canmorense Dn Canada. 



Anomozamites acutiloha Tleer? Canada. 



Anomozaiuites sp. Dn Cana<la. 



Antholithes horridus Dn_ Canada. 



Asplenium Dick.sonianum Heer. Canada. 



Asplenium distans Heer Caiuida. 



Asplenium martinianum Dn Caiuida. 



Baiera brevifolia Newb Great Falls. 



Baiera longifolia fPom.) Heer Canada. 



Baieropsis .sj). Dn Canada. 



Carpolithus v^-ginen.sis Font Great Falls. 



Carpolithus sp. Dn Canada. 



Cephalotaxopsis sp. Dn Canada. 



Chiropteris spatulata Newb. .. j. . Great Falls. 



Chiropteris Williainsii Newb Great Falls. 



Cladoplilebis angustifolia Newb Great Falls. 



Clado])hlebis Browniana (Dunk) Sew Canada and Great Falls. 



Cladoplilebis constricta Font. ? Great Falls. 



Cladophlebis distans Font, l Great Falls. 



Cladophlebis falcata Font Canada. 



Cladophlebis het erophylla Font Great Falls. 



Cladophlebis ])arva Font Great Falls. 



Cladophlebis SJ). Dm Canada. 



Cycadeosiiermum rotundatuiu Font.? , — Great Falls. 



Cyperites sp. Dn Canada. 



Di('ksonia sp. Dn . Canada. 



Dioonites borealis Dn Canada. 



Dryojjteris angusti])innata montanensis (Font.) Kn Great Falls. 



Dryopteris fredericksburgensis (Font.) Kn. .Great Falls. 



Dryopteris monocai])a (Font.) Kn Great Falls. 



Dryopteris montanensis (Font.) Kn Great Falls. 



