152 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



Generally the leaves are more distinctly narrowed to the short petiole than 

 in this one; hut even in the European specimens, as for example in the fine 

 branch figured by Sismonda {loc. cit.), this character is remarked quite as 

 frequently as that of the more acutely cuneate base. The differences are 

 especially appreciable in the three leaves from the Mississippi Lower Lig- 

 nitic, in Trans. Amer. Phil. Soc, loc. cit., where fig. 5 has its base still more 

 obtusely rounded than in Ihe leaf figured here; while fig. 7 has its lower part 

 more narrowed, as it is in tlie leavQg described by Heer, and fig. 6 is inter- 

 mediate between both. In all the fragments which have come under my 

 examination, the substance of the leaves appears coriaceous; the secondary 

 veins are scarcely perceivable and the borders seem narrowly reflexed. The 

 leaves do not vary greatly in size, averaging eight centimeters long and three 

 to four centimeters broad, being always, as seen in the figures given by the 

 authors cited, either obtuse or rounded, or even slightly emarginate at the 

 point. 



Habitat. — Marshall's, Erie, Colorado. Fischer Peak of the Raton 

 Mountains, New Mexico (Dr. F. V. Hayden). Six miles above Spring 

 Canon, near Fort Ellis, Montana (Dr. A. C. Peak). The specimen from 

 this last locality is obscure. 



Qnerciis ciiiereoides, ep.. nov. 



Plate XXI, Fig. 6. 



Leaf small, subcoriaceous, entire, narrowly ovate-lauceolate, acuminate, rounded to the petiole ; 

 middle nerve narrow; secondary veins curving toward the borders, camptodrome. 



This fine leaf, nearly five centimeters long, two centimeters broad in the 

 middle, its widest part, is narrowed by a curve- to the base, and seems to be 

 short-petioled (petiole broken). The secondary veins at unequal distance, 

 but parallel, join the narrow middle nerve under an angle of divergence of 

 40°, first nearly straight, then curving near and along the borders, or campto- 

 drome; the areas are all primary ones and undivided except by nervilles, 

 which, at right angle to the middle and secondary nerves, branch nearly in 

 the same direction, and form irregularly square or rectangular areolae. The 

 relation of this species is marked with the North American Quercus cinerea, 

 Michx., of the pine-barrens of the South, or to Quercus jthellos, \ar. maritima, 

 for its nervation at least. Among the fossil species, it is especially comparable 

 to Quercus salici7ia, Sap. (lilt., i, p. 24, pi. vi, fig. 6), of the Gypses of Aix, France. 



Habitat. — LocaUty unknown. 



