394 GEOLOGICAL SURVEY OF THE TERRITORIES. 



die nerve distinct ; veins 5 to 7, sJtaple, slightly curved inward, parallel, 

 obsolete, marking the borders as slightly serrulate by their impressions. 

 The substance otthe leaflets is subcoriaceous ; the surface smooth ; the 

 borders really entire, but, as it is the case in species of this kind when 

 they have a thick consistence, they are marked as apparently denticu- 

 late by the impression of the veins. Both primary and secondary rachis 

 are narrow; the secondary pinnse are sessile, not decurrent by the lowest 

 lobe. 



This species is closely allied to A Serrulatum, Heer, of the Boernstadt 

 flora, diflering by the more entire borders, more numerous tertiary veins, 

 &c. 



Sabitat. — Golden ; found only in fragments. 



GONIOPTERIS POLYPODIOIDES, Ett. 



Pinnae linear, lanceolate-pointed, remotely denticulate; primary veins 

 parallel and at equal distance ; secondary veins at an obtuse angle of 

 divergence, apparently alternate, simple, curved inward. By the form of 

 the pinnae and the distantly denticulate borders, the specimens represent 

 the European species asfiguredand described by theauthor in Mount Pro- 

 mina flora. The veins are, however, scarcely discernible, as also the very 

 small crenulations exposing the points of the secondary veins ; the points 

 of the middle veins, however, are marked by small, distinct teeth. The 

 identity of this form with the European species is not quite certain. 

 Its nervation is very undistinct. 



Sabitat— Sand Creek, W. H. Holmes. 



Sphbnopteris membranacea, sp. nov. 



Frond bi-tripinnate ; primary pinnae long, linear-lanceolate, rigid, erect, 

 or at a narrow angle of divergence ; tertiary pinna short, oblong lance- 

 olate, decurrent, deeply and equally 5-6-lobed ; lobes oblong, acute, or 

 slightly obtuse, distinct, to near the base, single-nerved. 



This is perhaps a variety of B. eocenica, Ett., described in Hayden's 

 Eeport for 1872, (p. 376,) a species very common at Golden. It has, 

 however, a different /acies, especially by its membranaceous shining sub- 

 stances, the rigid divisions, the much shorter ultimate pinnae, the more 

 distinct narrower pinnules, and thedecurringbaseof the secondary pinnae 

 joined by a margin along the rachis, &c. 



Habitat. — Golden, rare, A. Lakes. 



Sphenopteris nigricans, sj). nov. 



Frond polypinnate ; secondary (?) pinnae narrow, linear in outline, (as 

 much as can be seen from the fragments ;) tertiary pinnae at a right 

 angle of divergence from the narrow slightly-winged rachis, short, sessile, 

 (the lowest pinnules covering the rachis by their borders, but not decur- 

 rent,) linear, abruptly narrowed to a small obtuse terminal lobe, pin- 

 nately deeply-lobed; pinnules in right angles to the rachis, free to near the 

 base, oblong, obtuse, undulately pinnately-lobed on the borders ; middle 

 vein scarcely distinct, alternately pinnately-divided in 4 to 6 j)airs of 

 veinlets, curving downward, and forking once, except the upper pair, 

 which is simple. The surface seems to be villous or squamose, covered 

 as it is by a black pulverulent thin coating of coaly matter. The nerva- 

 tion of this species is pteroid. somewhat like that of Fteris blechnoides, 

 Heer, (Fl. Tert. Helv., I, p. 40, PI. xii, Fig. 8^;) the form of the leaflets 

 refers it, however, to the genus Sphenopteris. 



Habitat. — Black Butte. 



