DESCRIPTION OF SPECIES— MOKE^. 207 



species of Aristolocliia, liave distinctly the same essential characters as those 

 of /''. ijlanicostata and F. tiUcpfoUa, and represent the same type. Tlicy appear 

 to be as profusely distributed at some localities as F. ijlankostata is at Black 

 Buttes. 



Habitat. — Six miles above Spring Canon, Montana {Dr. A. C. Pcale); 

 lately obtained by the same geologist from north of Grand River, Colorado. 

 It is not rare at Golden, Colorado, where the fine specimen of fig. 5 was found. 



F i f II s a s a r I f o I ■ SI , Ett. 



Plate ].XI, Figs. 18-21. 



Ficus asarifolin, Ett., Foks. FI. v. Bil., p. t-0, pi. ssv, fig.s. 2, 3.— Sclip., Pal. V^g^t., ii, p. 748.— Lesqx., 

 Animal Report, 1872, p. 378; 1674, p. 303. 



Leaves petiuled, broadly reniform, bubcordate or subpcltate, rouudeU upward ; borders crenulate, 

 primary nerves palmately five to seven, tlie middle ones straight, the upper lateral ones somewhat 

 stronger than the lower, curving inward, branching and anastomosing with the branches of the middle 

 nerve, which are few and distant from the base; veinlcts thick, traiisvercal, forming by snbdivisions 

 an embossed-like, very distinct, polygonal areolation. 



Though this species has been already briefly described from specimens 

 found at Golden, it has not before been figured, the first fragments obtained 

 being all too incomplete. It is, however, recognized easily by its peculiar 

 nervation, forming in its subdivisions small, elevated, polygonal areolae, which 

 give to the surface the apjjearance of a very small embossed check-board, like 

 that of the leaves of Asartim Europcum. The meshes are mostly equilateral or 

 nearly square along the borders, more or less and irregularly expanding out- 

 side, and thus forming crenulations more or less distinct, according to the 

 size of the leaves. The fragments from Golden represent much larger leaves 

 than those described in the Flora of Bilin. Those figured here, from spe- 

 cimens of Point of Rocks, are perfectly well and entirely preserved, and 

 rather smaller than those of Europe. They are also slightly more enlarged 

 on the sides, or reniform, and the crenulation is scarcely distinct. But the 

 border divisions are, for their expansion, related to the areolation, which is pro- 

 portionate ill size to that of tiie leaves. The American leaves are' evidently 

 either peltate or auricled, as seen in three of the figured specimens. One only 

 has the base and the attachment of the thick petiole marked similarly to that 

 of the European leaves; but even the figures of the Bilin Flora seem to indicate 

 peltate leaves, whose borders are erased at the base or at the point of attach- 

 ment of the petiole. Fig. 21 of our plate also has a short, thick, flat petiole, 

 only one centimeter long; but it is evidently broken. These differences are 

 unimportant, and cannot be considered as specific characters. Our leaves. 



