38 DESCRIPTION OF SPECIES. 



The fine leaf, fig. 1, is nearly 12 centimeters long and 9 broad in 

 the middle, its widest part, coriaceous, deeply undulate. The nervation is 

 thick and coarse, the secondary nerves, 8 pairs, alternate, diverging at an 

 angle of 50° are parallel, except a pair of basilar, thin, short marginal 

 veinlets which, nearly at right angles to the medial nerve, follow close to 

 the borders. The lower veins are more or less branching and enter the 

 undulations or broad obtuse teeth, somewhat less prominent at the ends 

 of the branches than at those of the nerves. The nervilles thin, but very 

 distinct, are flexuous, at right angles to the veins, more generally contin- 

 uous. Fig. 2 is an incomplete fragment which I consider as representing 

 the same species. The upper end of the veins and of their branches are 

 connected by strong nervilles following close to the borders; but they are 

 not subdivisions of the secondary veins. This nervation is like that of 

 Castanea and of some species of Quercus. 



Hab. — Fort Harker, Kansas. Chs. Sternberg. 



Dryophylluni (Quercus) Holmesii, Leaqx. 

 Plate IV, Fig. 8. 

 Dryophyllum (Quercus) talicifolium, 1 Lesqx., Hayden's "Ann. Rep.," 1874, p. 340, pi. viii, fig. 2. 



Leaf linear-lanceolate, rounded in narrowing to the base, minutely acutely den- 

 ticulate; lateral nerves numerous, parallel, alternate or opposite, slightly bowed sub- 

 camptodrome. 



The fragment represents a slightly falcate somewhat thick leaf, rather 

 membranaceous than coriaceous, with a narrow medial nerve and close 

 parallel secondary ones, some of them as far as can be seen ascending to 

 the teeth and passing under the sinuses by an upper branch, some others 

 curving along the borders and reaching the teeth by short branchlets. 

 This species is related to Dryophyllum lineare, Sap., "Sez. Fl.," p. 350, pi. 

 iv, fig. 6. The teeth, however, of the American species are more distinct, 

 turned outside in the lower part of the leaf, inclined upward in the upper 

 part, as in D. subcretaceum of the same author, ibid., p. 348, fig. 10. 



Hab. — Near the San Juan River, at a higher Cretaceous stage than 

 that of the Dakota Group; Southwest Colorado. W. H. Holmes. 



1 Name preoccupied as Quercus salicifolia, Newby., " Ext. Fl.," p. 24. 



