260 DESCEIPTION OF SPECIES. 



SALICINE^. 



Salix Rseaua, Heer. 

 " Fl. Arcl.," i, p. 102, pi. iv, figs. 11-13 ; xlvii, fig. 11. 



Species described by Heer from specimens of Greenland. 

 Hab. — Cook Inlet, Alaska. 



Populus Richardsoni, Heer. 

 "U.S.Geol. Rep.," vii, p. 177. 



Species abundantly represented in the Miocene aad Flora of Green- 

 land and Spitzberg. 



Hab. — Ghicknic Bay, Alaska. 



Populiis arctica, Heer. 

 "U. S. Geol. Bep.," vii, p. 178. 



Has the same distribution as the preceding, and is still more common 

 in the Miocene of Greenland and North America. 

 Hab. — AVith the preceding. 



ULMACEtE. 



Ulnius sorbifolia, Ung. 

 Goepp., "Schoss. FI.," p. 30,pl.xiv, fig. 10. 



Leaf oblong, with borders parallel in the middle, taper-pointed or acuminate ; 

 secondary nerves numerous, close, parallel, half open (angle of divergence 60°), gen- 

 erally forking near the doubly dentate-crenate borders ; primary teeth blunt, turned 

 upward. 



The base of the leaf is destroyed. The preserved part is 4i centi- 

 meters long, 2 centimeters broad, with 18 pairs of deeply marked second- 

 ary veins. 



The species, which is not mentioned in Schimper's "Pal. Veget.," is 

 closely allied to U. plurinervia^ Ung., which has been found in Alaska. 



Hab. — Cuyachick Bay, Cook Inlet, Alaska. 



