322 GEOLOGICAL SURVEY OF THE TERRITORIES. 



added in this review oue species of Gleichenia and five species of Conifers. 

 The specific value of some of the vegetable remains referable to this last 

 family is, however, doubtful, especially for those which are represented 

 by cones only, Ahietites Ernestines, Sequoia formosa, Sequoia Reich- 

 enbachi, and the fragments described as Inolepis, all which, however, 

 though uncertain their specific or generic relation may be, are evidently 

 representatives of some species of Conifers. The fragments referable 

 to this group are of a difficult determination ; for the organs represented 

 upon the coarse shale or hard ferruginous sandstone of the formation, 

 merely expose some outlines of their forms by the same kind of fossili- 

 zation or molding, remarked already for the leaves. We do not find, 

 therefore, any flattened cones with the scales, any flattened branches with 

 leaves, but impressions only, more or less deeply carved into the 

 stone, the cones even passing through the shales and showing the space 

 originally occupied, as a mere cylindrical hollow, around which the forms 

 of the scales are more or less clearly engraved. The numerous leaves of 

 Pinus spread upon the surface have dug in the same way and by their 

 hard substance, narrow linear channels, representing the back of 

 these leaves, with an indistinct midrib, and the branchlets of Sequoia 

 also are seen as longitudinal grooves, bearing on both sides the same 

 impressed form of their leaves. This cannot be considered a very dis- 

 tinct representation of characters, the minute details desirable for an 

 exact determination being more or less obsolete. 



Among the specimens recently examined, a fragment has been found 

 referable to Phyllocladus ; the presence of this genus in the Cretaceous 

 flora is thus sufficiently ascertained. We may, therefore, record as 

 recognized in the flora of the Dakota group, for the Ferns, the genera 

 Lygodium, Sphenopteris, Hymenophyllum, and Gleichenia, the three first 

 by each one species, the last by two ; and in the Conifers, Sequoia, 

 by three species; Pinus, by one, and Phyllocladus by one, leaving out 

 as of uncertain generic relation with the cones mentioned above, 

 Glyptostrobus (?) gracillimus, which is perhaps identifiable with Sequoia 

 condita, or with Frenelites, and Geinitsia (?), known merely by the im- 

 pressions of some detached scales. To this should be added Araucaria 

 spatulata, described in extinct floras of North America by Dr. New- 

 berry, from Nebraska specimens. 



A fine plant, doubtfully described with the Ferns in Cretaceous 

 Flora, p. 48, Plate XXIX, figs. 1-4, under the name of Todea (?) 

 saportanea, has to be eliminated from this family. For, though the 

 shape of the leaflets, their mode of union to the rachis, the position 

 of parallel equal branches are, by similarity, comparable to leaflets and 

 to divisions of fronds of ferns, the areolation of the leaves, which has been 

 studied from better specimens and figured here again, PI. VI, fig. 2, 

 more positively relates these vegetable fragments to a peculiar section 

 of the Proteacece or to Lomatia, a genus especially represented in Aus- 

 tralian Islands and on the southwestern coast of South America, Chili, 

 and Peru. For this separation I readily submit to the opinions of 

 learned friendly critics. But I cannot consider the glumaceous leaf and 

 tubercle described as Phragmites cretaceous in Cret. FJ., p. 55, PI. I, 

 figs. 13, 14, and PL XXIX, fig. 7, as a species of Dracaena or Yucca, &c. 

 The tubercle represented (fig. 13) is really similar to organs of the same 

 kind found attached to Rhizomas and to stems of fossil Phragmites and 

 Arundo. And for confirmation of the warranted reference of these 

 fragments, we have now in Arundo greenlandica, Heer. Fl. Arct., VIII, 

 p. 104, PI. XXVIII, figs. 8-11, leaves which, though narrower, have the 

 same form and the same characters of nervations as those of the Dakota 



