379 



7. FlCUS ASAEIFOLIA, Ett. 



The same kind of leaves as those former!}^ described. 



8. Ficus Dalmatica, Ett. 



One of the specimens has a branch with two pairs of opposite leaves at 

 a distance of two centimeters, and at its top, two branchlets, one broken, 

 the other bearing an opening bud, with still half-folded leaves, indicating 

 by the faces i3ressed against each other a condnplicate vernation. 



9. ElCUS PLANICOSTATA, Lsqx. 



A young leaf preserved in its integrity. This species, as remarked 

 already, is abundant at Black Butte. 



10. Dryophyllum subfalcatum, sp. nov. 



Leaf subcoriaceous, linear-lanceolate, acuminate or sharply pointed ; 

 borders regularly serrate with short blunt teeth turned upward 5 lateral 

 veins parallel, diverging thirty to forty degrees, straight to the point of 

 the teeth; fibrillse close, thin but distinct, simple or ramified in the 

 middle, the upper ones joining nearly in right angle, a branch veinlet 

 passing from near the point of the lateral veins under the sinuses, and 

 following along and close to the borders. 



There is only a fragmentary specimen of this species, the upper half 

 of a leaf. By its form and nervation, it seems at first referable to the 

 genus Castanea, and, truly, it would be easy to find leaves of the present 

 (J. vesca apparently perfectly similar to this fossil one. There is, how- 

 ever, a difference in the areolation, or in the arrangement of the tertiary 

 veins. In these primary types of Quercus and Castanea described under 

 the name of Dryophyllum, the upper branch of the secondary veins 

 passes from near the point of the vein under the sinuses and closely'" 

 follows the borders, which thus sometimes appear narrowly marginate, 

 and is joined nearly at right angle by the upper fibrillfe. This charac- 

 ter, though still indistinctly traced in the leaves of Castanea, and of 

 some species of chestnut-oaks, is far less regular, the upper branches 

 which follow the borders being of various sizes, not so exactly parallel 

 to the bordfers, and not in close proximity to them. This new species is 

 intimately related to Dryophyllum JDeicalquei Sap. & Mer. {Flore de Ge- 

 Unden,) especially to the fragment figured in PI. Ill, fig. 2. It differs only 

 by the shorter, less acute, teeth of the borders, the slightly falcate form 

 of the leaf, and the close thin fibrilhie. 



Habitat. — Point of Eocks, William Clehurn. 



11. POPULUS MELANARIOIDES, Sp. noV. 



Leaf subcoriaceous, nearly round, subtruncate at base, long-petioled; 

 borders undulate ; nervation ternate from above the base of the leaf, 

 secondary veins two pairs, at a great distance from the primary ones, 

 these much branched outside; the others simple, all the divisions pass- 

 ing to near the borders, where they become effaced in the areolation ; 

 nervilles thick, flexuous, in right angle to the veins, forming by rami- 

 fication at right angle square i)olygonal meshes. 



By the subcoriaceous substance, the long slender petiole of the leaves, 

 this species is referable to the section of the Trepid(e (Trembling Pop- 

 lars). As in Poimliis tremulcefolia, Sap. (Et., 3, 2, p. 26, PI. Ill, fig. 4), to 

 which this species is allied, the veins and their branches pass through 

 the areas to very near the borders, which they seem to reach. The 

 American form differs merely by less-distinctly undulate borders, the 

 distance of the primary lateral nerves above the base, and by the great 

 distance of the secondary veins. These two last characters are, how- 



