GEOLOGICAL SUEVEY OF THE TERRITORIES. 295 



PlatAnus nobilis, I^ewby. A number of specimens, mere fragments 

 of a very large leaf, with nervation of this species. The leaf is still 

 larger than the beautifal specimen described by Dr. Newberry, loc. 

 cit., p. 66, PL xvii, ined. 



Rhamnus eegtinervis, Heer, (Fl. Ter. Helv., Ill, p. 80, PI. cxxv. 

 Figs. 2-6.) The leaves representing this species are as large, even 

 larger, than the greatest leaf (Fig. 6) figured from European specimens. 

 The secondary veins are nearer to each other, or more numerous, at least 

 15 i}airs in a leaf of the same size as that of Fig. 6. But these differ- 

 ences are of no specific value, fragments of other leaves of the same 

 showing a variable distance between the veins. The borders of the 

 leaves are entire, except near the point, where they are sometimes den- 

 ticulate. The secondary veins, deeply marked, slightly curved in going 

 out from the medial nferve, ascend straight to the borders in an angle 

 diverging 25^ to 30o. 



Cahpolithes lineatus, Xewby., (PI. xxv. Fig. 1, ined.) Appa- 

 rently the same kind of nut, as yet undescribed. All Dr. Hayden's 

 specimens, found in great numbers scattered in the sandstone, are more 

 or less flattened, round-oval in outliue, marked with thin striWy but 

 without the point as in the figure loc. clt.^ which would indicate them 

 as fruits of a Coryhis. The name of the fruit is therefore preserved ; 

 but its relation to species of our present vegetation is as yet unknown. 

 They are apparently referable to palms. 



16. Divide between the Source op Snake River and the 

 Southern Shore of Yellowstone Lake. 



A grayish, fine-grained, hard shale, breaking in layers, with few 

 remains of plants. 



Gymnogramma Haydenii, sp. nov. A fine fern, with a frond ap- 

 X^arently tripinnate; j?i?z?ia', long, linear-lanceolate, gradually decreasing 

 to an obtuse point, pinnately divided toward the lower part in alternate 

 linear-lanceolate, obtuse i)innules or lobes, enlarged downward in a 

 broad, decurring base, distantly serrulate, and disconnected nearly to 

 the main rachis j toward the upper part of the pinnce the di^^sions 

 become shorter and broader, about triangular-obtuse in outline, con- 

 nected from the ^niddle ; near the point they are united nearly in their 

 whole length, i)assing to a terminal, siuall, obtuse leaflet. The nervation 

 is not quite distinct; medial nerve, thin, well marked in the lovrer divis- 

 ions, becoming obsolete in the upper ones; secondary veins very oblique 

 to the medial nerve; the lowest ones coming out from the main rachis^ 

 at least in the largest decurrent divisions ; all dichotomous in ascending. 

 The substance of the leaves is thick, and the veinlets appear to be ren- 

 dered obsolete by particles of pulverulent matter hardened into coal. 

 By the form of its divisions, this species is related to Splienoptcy'is Blom- 

 strandi^ Heer, (Fl. Arc, I, p. 155, Tab. xxix. Fig. 1-5, Da,) from the Miocene 

 of Spitzbergen, differing essentially by its nervation, which is more like 

 that of Gymnogramma tartarea, Desv. Even in the mode of division and 

 the form of the lobes, this last species, especially in specimens obtained 

 from cultivation, resembles the fossil plant. The small, badly preserved 

 fragments obtained from near Gold City, and considered with doubt as 

 a Lathrcca in Am. Jour. Sci;, March, 1868, i). 207, is probably referable 

 to this species. 



Sabal major, (?) Ung. This specimen has only broken i)arts ol 

 lateral rays and the undistinct point of the rachis (?) of a iSabal. Ifc 

 represents a large species ; maybe Sahal Campbellil^ (.7]S"ewl)y. 



