DESCRIPTION OF SPECIES. 39 
Vol. VI, Abth. II, Pl. XLIV, fig. 2, is a fragment of a fern to which the 
name Dicksonia borealis is given. ‘This specimen consists of parts of four 
contiguous pinnee, which afford a very imperfect view of the plant to which 
they belong. It is evident, however, that this was closely allied to the fern 
now under consideration, the only perceptible difference being that the 
pinnules of the Greenland plant are narrower and less acute. So also on 
Pl. XXXIV of the same volume—a plate devoted to Aspidium Oerstedi— 
in fig. 8 is represented a small portion of the upper part of a fern frond 
in which the pinne are narrow, the pinnules closely set at a very acute 
angle with the midrib, decurrent, entire-margined and acute, in all respects 
resembling some portions of the frond of Anemia stricta and almost certainly 
different from Aspidium Oerstedi. 
Though not rare at Woodbridge in certain layers of the clay, Anemia 
stricta has up to the present time been found nowhere else. No traces of 
fructification have yet been detected on any of the specimens. As may 
be inferred from the figures, the sterile frond was ternate and the fruit was 
probably borne on a distinct stipe. 
Locality: Woodbridge. 
AspLeNIuM Dicksonranum Heer. 
PI. I, figs. 6,7; Pl. IL, figs. 1-8; Pl. III, fig. 3. 
Asplenium Dicksonianum Heer, Fl. Foss. Arct., Vol. III, Part Il, p. 31, Pl. I, figs. 1-5; 
Vol. VI, Abth. II, p. 3, Pl. Il, figs. 2, 2b; p. 33, Pl. XXXII, figs. 1-8. 
In the Kreide-Flora der Arctischen Zone (Flora Fossilis Arctica, Vol. 
III, Part H, p. 31, Pl. 1), Prof. Oswald Heer describes a fern which I am 
entirely unable to distinguish from one that occurs abundantly at Wood- 
bridge. We have now collected many hundred specimens of this fern, and 
have learned that its fronds were of large size and differed much in the 
details of the different parts. Selections have been made from this large 
amount of material for the figures on Pls. I, I, III, and since all the dif- 
ferent phases here presented are fossilized together and are connected by 
intermediate forms, it is impossible to resist the conviction that they all 
belong to one species. By reference to the numerous illustrations given 
by Heer, a satisfactory comparison may be made with the figures now 
