384 GEOLOGICAL SURVEY OF THE TERRITORIES. 



eating identity of horizontal station ; those from Barrel's Spring upon 

 yellow ferruginous shale, having upon all the specimens the same species 

 of fossil plant also, but of a different group from that of the former. 

 Henry's Fork specimens have: 



1. Pteris pennceformis, Heer, in numerous but indistinct specimens. 

 The species may differ somewhat from that of Europe, but, in the state 

 of the specimens, the difference is not appreciable. It is a large, lanceo- 

 late leaf, varying from one to three inches in length, and from one-half 

 to three-fourths of an inch broad, with a thick, half-round medial nerve, 

 and thick, mostly simple, secondary veins, obliquely curving to the 

 borders. This species is not rare in the miocene of Germany and Swit- 

 zerland. 



2. Broken, obscure remains of a large leaf, with thick, oblique, straight, 

 closely approached secondary veins ; neither the middle part nor the 

 medial nerve, nor the borders are seen. It may be compared only to 

 some Pahnacites^ or to the leaf described as Zingiberites, from the mio- 

 cene of Europe, by Professor Heer. 



3. Fragments of a Calamopsis, or palm leaves, (ra,chis not seen,) one inch 

 broad and as far distant from each other, marked lengthwise with four 

 narrow tertiary veins between the more distinct secondary ones, five to 

 six in number. 



4. Leaves of a Cyperites, with the same areolations as Cyperus Chavan- 

 ensis, Heer, but only half as broad. 



From Muddy Creek : 



5. Aspidium(Lastraea)puleJiellum, Heer, or A. Fisheri, Heer. Though 

 small, the specimens are distinct. The leaflets are slightly broader than 

 in this last species, and not quite as large as in the former. An inter- 

 mediate form, equally referable to both of the species of the miocene 

 of Europe. All the specimens of the former and of the following locality 

 have fragments of it. 



From Black's Fork : The specimens have only fragments of the last 

 species, and of Pteris pennceformis, with undeterminable leaves of Cy- 

 perites, resembling Carex tertiaria, Heer. 



Barrel Spring : All the shale have numerous remains of the three 

 following species. The fourth is represented in only one : 



6. Lygodium neuropteroides, Spec. nova. A beautiful fern, of which 

 only separate leaflets are preserved. These, from one to two and a half 

 inches in length, proportionally broad, are linear lanceolate, slightly 

 obtuse, either entire or more generally divided from below the middle 

 in two or three linear lanceolate lobes, like the living Lygodium tSalici- 

 folium. But the nervation is far different, rather comparable to that of 

 a Pteris than to that of a Lygodium. The medial nerve is thin ; the 

 secondary nerves branch three or four times in curving to the borders. 

 It is a nervation like that of some species of Neuropteris of the coal 

 measures, especially of Neuropteris hirsuta, which the large, entire leaf- 

 lets also resemble in their form. The relation of this beautiful fern is 

 with species of Lygodium and of Osmunda of the European miocene, but 

 this relation is distant indeed. 



7. A floating stem, like Myriophyllum, referable perhaps to one species 

 of this genus. As the divisions are pretty thick, it may be rather com- 

 pared to the roots and rootlets of Pragmitcs Oenigensis, Heer. It 

 is evidently related to species of our time. This Pragmites of Heer is 

 from the miocene of Europe. Leaves of a species of this genus have 

 been published by the same author from the tertiary of Alaska. 



Cyperus Deucalionis, Heer. The specimens have a number of leaves 

 of this species, which show all the varieties of the European plant with- 



