11(5 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



mediate veinlcts, wliich, thougli ve4y close, are clearly seen where the epi- 

 dermis is destroyed. The flat, narrow rachis, apparently linear, is five milli- 

 meters wide, nerved, the middle veins being stronger than the two secondary 

 ones on each side of it. This part of frond is closely allied by its characters 

 to Flahellaria Zinkenii?, Heer, described above from specimens found at the 

 same locality. As no account can be taken of the rachis, which was not 

 observable in F. Zinkenii, we have only the rays for point of comparison. 

 In the present species, the rays are quite flat, broader, all connected ; the 

 primary veins are distinct, but neither prominent above the surface, nor as 

 thick; and, discernible through the epidermis, they are more distant, and 

 have generally ten intermediate veinlets, visible only where the epidermis is 

 removed. This fragment therefore represents a distinct and peculiar species. 

 Its relation is to Ludoviopsis geonom<zfolia, Sap. (S(iz. Fl., p. 339, pi. iv, 

 figs. 1, 3). In considering fig. 1 of this flora as a young leaf, whose narrow 

 linear rachis is indicated from above the petiole, and fig. 3, regarded by the 

 author as pertaining to another species, L. discerpta^ as a fragment of an old 

 leaf of the same, both united together would show us some of the characters 

 which have been described above, viz, beside the rachis, the narrow flat rays, 

 which in their conjunction join the rachis by their whole base in a very acute 

 angle of divergence. The primary nervation of the fragment (fig. 3) is, it 

 seems, the same as in the American species; it is, however, too obscurely 

 indicated for a reliable comparison. 



Habitat. — Golden, Colorado; South Mountain. 



G c o II o HI i t c s S c li i ni p e r i , sp. nov. 



Plate X, Fig. 1. 



Frond largo ; rays flat, obtusely carinate, balf-sheathing or decurront to a narrow rachis, obscurely 

 nerved; primary veins thick or inflated ; intermediate nerves few, three or four. 



The specimen represents a portion of a splendid, evidently long and 

 large leaf. The rachis is narrow, not more than four millimeters thick at the 

 lowest part of the specimen, very slowly decreasing in size, as, at the top of 

 the specimen, which is twenty-two centimeters long, it still measures three 

 millimeters. It appears half-round and striate, but is only distinct at a few 

 places, the rays apparently covering it by their decurrent or half-sheathing 

 base. The rays are scarcely narrowed at the base, enlarging a little above 

 it, and connected by their borders, thence decreasing upward, soon disjointed, 

 and thus palmato-pinnate; they average in width two and a half centimeters 



