DESCRIPTION OF SPECIES— FILICES. 57 



along the rachis by the expansion of the lower leaflets ; the lobes turned 

 upward are oblong, narrowed into an obtuse point, alternate, free to below 

 the middle; the middle nerve is strong, continuous to the point; the lateral 

 veins simple, five or six pairs, open, and curving upward in passing to the 

 borders. Comparing this species to both Lastrea pulchella and L. Fischeri, 

 Heer (Flor. Tert. Helvet., I, pp. 33 and 34, pi. ix, figs. 2 and 3), the close 

 relation of this fragment is easily remarked, the form of the lobes being 

 analogous to that of fig. 2, and the disposition of the veins, which are more 

 numerous, like that of fig. 3 of the Flor. Tert. There is, however, a difference, 

 which prevents considering the American form as identical with these Euro- 

 pean species ; it is the evident connection of the pinnse by the lower and 

 inferior pinnules, broadly extending and deciirrent by their base along the 

 main rachis, a character marked only, and indistinctly, upon L. pulchella, fig. 

 2 c of the same plate. It seems, therefore, advisable to consider this species 

 as separate. The specimens briefly described in Report, 1870, were mere scat- 

 tered fragments of pinna?, none of them showing the mode of attachment 

 to the rachis. This form is-also comparable to Alsophila Pomelii, Sap. (Sdz. 

 Fl., p. 40, pi. 3, fig. 2). 



Habitat. — The specimens described in Annual Report, 1870, are from 

 Henry's Fork, a mixed lot ; the first one sent by Prof. F. V. Haijden. That 

 figured here is from Golden, Colorado. 



Liastrca (Ooniopteris) polypodioides!, Ett. 



Plate IV, Figs. 11, 12. 



Goniopteris pohjpoilmdes, Ett., Flor. of Prom., p. 10, pi. ii, figs. 1-4.— Lesqx., Annual Report, 1873, p. 394. 



Pinnae large, linear-lauceolate, pointed, undulately lobeil, indistinctly denticulate ; primary veins 

 equidistant, parallel ; lateral veins at an acute angle of divergence, apparently alternate, simple, and 

 curved inward. 



The fragments figured here, and described as probably representing 

 the species of d'Ettingshausen, are too obscure for positive identification. 

 The divisions, or lobes, are scarcely marked by undulations along the pinnas, 

 and also the distant, irregular, small teeth are not distinctly seen, the borders 

 appearing here and there like serrulate. The nervation is of the same type, 

 and quite as obscure as it appears to be on the European specimens. Judg- 

 ing from the figures of the Prom. FL, there is therefore a marked relation 

 between tiie species, but the identity is doubtful. 



Habitat. — Sand Creek, Colorado ( W. H. Holmes). 



