46 



Hymenophyllum cretaceum, Lesqx., Hayden's Report, 1872, p. 421. 



As .seen from the figures, we have three specimens of this species. The 

 one, Fig. 3, represents a narrow linear lanceolate pinna with alternate pinnules 

 more closely approached towards the point ; the second, Fig. 4, represents an 

 upper or terminal lohe of an apparently larger pinna. The third is of the 

 same character, with longer narrower lohes. These fragments indicate a 

 species variable in its modes of division and in the size of the pinnules, which, 

 however, have the same general form and the same nervation. The texture 

 of this fern appears thickish, subcoriaceous ; the nerves and their dichotomous 

 simple branches are well marked, and ascend to the upper borders of each 

 pinnule, which they sometimes mark by depression into a small notch. No 

 species related to this has been described, though it may be compared to 

 Sphenopteris Johnstrupi, Heer, of the Cretaceous flora of North Greenland, 

 Arc. Fl., p. 78 ; PI. xliii, Fig. 7. Its analogy is rather with species of the 

 section of the Sphenopteris hymenophylloides, mostly represented in the Carbon- 

 iferous measures, and still more with a number of species of Hymenophyllum 

 of Cuba, or of the north tropical region of this continent. 



Dr. Newberry, in Notes on the extinct Jloras, &c, p. 10, has described 

 as Sphenopteris corrugata, a species which, from the description, at least, seems 

 related to this one. 



Habitat. — Eight miles south of Fort Harker, Kansas. 



Pecopteris nebraskanaC!) Heer, PI. xxx, Fig. 12 b . 



Pinua coriaceous, linear lanceolate obtuse, alternately equally lobed ; lobes more or less disjointed, 

 turned outside, obtuse; medial vein tbiu, uudulating ; divisious alternate and alternately branching in 

 simple veinlets, ascendiug to the borders. 



The small branch, a pinna, represented by the specimen is 2 centi- 

 meters long, 8 millimeters broad, near the abruptly attenuated base, 4 mil- 

 limeter's near the obtuse point; cut in obtuse lobes, the four inferior ones 

 disjointed to below the middle, enlarging upwards to a very obtuse point and 

 turned outside, the upper ones connected nearly to the borders, which are 

 slightly crenate, by the impression of the veins or the wrinkled surface of the 

 pinna ; secondary veins alternate, decurring to the middle one, which they 

 join in a very acute angle, alternately pinnately and simply branching twice 

 on each side, rarely thrice, the branches ascending to the borders. 



I find this species figured, not described, in Flore fossile de Sezane, by Sap- 

 orta, p. 332, with the remark that it is still inedited. The fragment from which 



