DESCRIPTION OF SPECIES. 65 



QUEECUS GLASCOENA, Sp. UOV. 

 PL VI, Fig. 6. 



Leaves subcoriaceous or membranous, with polished smface, ovate, 

 obtuse, broadly cuneate to the petiole; borders entire, slightly undulate; 

 median nerve thick; secondaries thin, few, five to six pairs, parallel, the lower 

 ones opposite; nervilles oblique, thin, straight, simple, and percurreut. 



The leaf is G.S*"" long-, broken or erased at the apex and thus apparently 

 obtuse, nearly S""" broad below the middle ; the secondaries thin, at an angle 

 of 40° to 50°, are somewhat flexuous or slightly curved upward in traversing 

 the lamina, mostly simple, craspedodrome, or the upper ones apparently 

 camptodrome, the lowest pair suprabasilar; nervilles very thin, oblicpie to 

 the nerves. The petiole is strong like the median nerve, broken 6™™ below 

 the base of the leaf 



The leaf has, by its mixed nervation and undulate borders, the appear- 

 ance of Hamamelites fother/jUlokles Sap.,' from which it diff'ers by its form, 

 its nearly entire borders and the wider divergence of the secondaries. It 

 has a gi'eater degree of affinity to Qiierciis Larfiucnsis Sap.,^ not only by its 

 siiiiilar form but by the character of the nervation, the secondaries being 

 equally distant, camptodrome or craspedodrome and the nervilles oblique 

 to the secondaries. 



Habitat: Seven miles northeast of Grlascoe, Kansas. No. 482 of the 

 Museum of Comparative Zoology of Cambridge, Massachusetts. 



QUEECUS ELLSWOETHIANA Lesq. 

 Cret. FL, p. 65, PI. vi. Fig. 7. 



QUEKCUS MOEEISONIANA Lesq. 

 Cret. and Tert. Fl., p. 40, PI. xvii, Figs. 1, 2. 



QUERCUS SALICIFOLIA Newb. 



Later Ext. Fl,, p. 24, Dlustr. Cret. aud Tert. PL, PL ii. Fig. 1. 



QlTEECUS CUNEATA Newb. 

 Later Ext. FL, p. 25.^ 



I Fl. Foss. S<5zaDne, p. 393, PI. xi, Fig. 3. 



■■"Etmlea, vol. 3, p. G7, PI. v, Fig. 1. 



^ Qaercua antiqua and Q. sinuata Newb. (Later Ext. Fl., pp. 26, 27), from tlie lower Crctaceona 

 sandstone, banks of Rio Dolores, southern Utah, are omitted here, as the geological stage of the 

 formation is not identified with that of the Dakota group. 



