70 DESCRIPTION OF SPECIES. 



Ha m am elites tenuinervis, sp. nov. 



Leaf broadly ovate, rounded at both ends, entire from tbe middle downward, 

 regularly deeply undulate upward, pinnately nerved; lower lateral nerves alternate, 

 curving along the borders, cainptodrome, mostly simple, tbe upper more oblique, simple 

 or branching, reacbiug tbe borders at tbe outer end of tbe undulations, or broad round 

 teetb. 



The base of the lateral medial nerves is somewhat decurrent in join- 

 ing the midrib at an acute angle of divergence, while the lower ones, more 

 open, join it in a broad curve nearly at right angles, all more or less 

 curving in passing to the borders. The leaf is 5 centimeters long without 

 the short petiole (about 1 centimeter long), and nearly as broad. The only 

 leaf known to me, to which this might be compared, is Parrotia pristina, 

 Heer, "Fl. Arct.," vol. iv, p. 83, pi. xxi, fig. 5 (Quercus fagifolia, Goepp.), 

 from which it differs not only by the leaf being shorter and broader, but 

 by the distribution of the lateral nerves, the two lower pairs being alter- 

 nate and at a short distance from each other, as in Alntis serrulata, Linn., 

 while the upper, sub-opposite, parallel, and more distant, are branched 

 and reach the borders at a more acute angle of divergence and a less 

 pronounced curve. 



Hah. — Four miles northeast of Minneapolis, Kansas. Chs. Sternberg. 



Hamamelites quadrangularis, Lesqx. 



Hayden's "Ann. Rep.," 1874, p. 355. 



Alnites quadrangularis, Lesqx., "U. S. Geol. Rep.," vi, p. 62, pi. iv, fig. 1. 



The leaf is small, slightly more coriaceous than the one described 

 above; the borders are less distinctly undulate, and the secondary nerves 

 thick, closely parallel, less divided; the two lower pairs of nerves are thin- 

 ner and closer, following the borders like marginal nerves. 



Hamamelites Kansaseanus, Lesqx. 



Plate IV, Fig. 5. 



Hayden's 'Ann. Rep.," 1874, p. 355. 



Alnus KansaJieanus, Lesqx.. "U. S. Geol. Rep.," vi, p. 62, pi. xxx, fig. 8. 



From the specimen figured here, which is better preserved than that 

 copied in the "U. S. Geol. Rep.," vi, the description is somewhat modified. 

 The leaves are small, obovate in outline, cordate or obtuse at the gradually 



