DESCRIPTIONS OF SPECIES. 73 



Quergus coriacea Newb. 



PI. XIX, figs. 1-3; XX, fig. 5. 

 Bost. Journ. Nat. Hist., Vol. VII (1863), p. 521. 



"Leaves lanceolate, long-pointed, acute, wedge-shaped at base, decur- 

 rent on the petiole; margins entire, or rarely bearing a few acute teeth 

 toward the summit ; nervation strongly marked ; midrib strong ; lateral 

 nerves numerous, subparallel, branching and inosculating at the summit." 



This is one of the willow oaks represented among recent species by 

 Q. imbricaria, etc. 



The figures given illustrate the variations of form exhibited in the 

 collection. From these it will be seen that, with the general character of 

 Q. clilorophylla Ung. and Q. el&na Ung., it is distinct from both, the first 

 being rounded above and with finer nerves, the second larger and narrower, 

 with a nervation finer and closer and the summits of the lateral nerves 

 more distinctly and regularly united. 



Formation and locality: Cretaceous (Puget Sound group). Chucka- 

 nutz, near Bellmg-ham Bay, Washington. 



Quercus dubia Newb. 

 PI. XXXVII, fig. 5. 



Proc. U. S. Nat. Mus.,'Vol. V (March 21, 1883), p. 506; Ills. Cret. and Tert. PL, 

 (1878), PI. XX, fig. 5, under Phyllites cupanioides. 



"Leaf ovoid in outline, unsymmetrical ; margins strongly and remotely 

 toothed; teeth subacute or obtuse; nervation delicate; midrib flexuous; 

 lateral branches, about six on a side, somewhat waved, branched, and 

 interlocking, and terminating in the marginal denticles; surface smooth, 

 consistence probably somewhat coriaceous." 



Collected by Dr. F. V. Hayden. 



This is a strongly marked leaf which most resembles that of some of 

 the live oaks. The texture was evidently leathery, the surface smooth ; the 

 nervation is that of Quercus or Ilex, as well as the marginal dentation. 

 The species with which it may be compared are Q. aspera Ung. (Chlor. 

 Prot, p- 108, PI. XXX, figs. 1-3), Q. Buclm Web. (Pakeontogr. (1852), p. 1 71 

 [57], PI XIX [II], fig 4), and Q ilicoides Heer (Fl. Tert. Helv, Vol. II, 



