with Descriptions of New S} p 



tion commences. The second pair of lateral nerves each send off 

 two or three slender nerves from near the summit t-> the teeth of 

 the adjacent margin; tertiary nerves very fine, leaving the second- 

 aries at right angles, and forming a fine net-work of which the 



areola? are nearly quadrate. 



The number of specimens of this species in tin- 

 small, and all but one imperfect. This one is evidently the 

 impression of a thin, delicate leaf, of which all the details 

 nervation are preserved as perfectly as they could have ap- 

 peared in the living plant. The other specimens indicate that 

 the leaves were usually pointed, often acute. 



From the nervation and character of dentation of th< 

 leaves, I think we may at least say that the plant which b 

 them was rosaceous, and among the rosaceous genera with 

 which I have compared them they approach most nearlj 

 Amelanchier / some of the leaves of A. Canadensis being 

 tirely undistinguishable from them in fur r nervation. 



A. Canadensis now grows fiver all the temperate parts "f the 

 continent, and would seem from its wide range t.» he as likely 

 to be an old resident of the continent, and t<» he represented in 

 the Tertiary, as any other of our pin 



Formation and Locality. Lignite Tertiary beds. Bank 

 Yellowstone River. (Dr. Hayden.i 



Rim minis elegans (n. pi 



Leaves lanceolate, entire, rounded or abruptly narrowed 

 base, long-pointed and acute above, broadest part one-third 

 distance from the base to apex ; nervation regular and bat 



delicate, midrib strongly marked, lateral i 

 equidistant on either side, gently arched upward, and t< 

 in the margins; tertiary nerves numerous, fine, spannii 

 tance between the branch nerves, and dividing 1 1 1 i - 

 row, sub-rectangular areoles. 



This is a remarkably neat and symmetrical 

 eards ir^ outline and nervation. I'- 

 little of the rigidity that characterizes thi 



APBEL, 186a 1 ' ,T H,,T 



