ADDED TO THE FLORA OF THE LARAMIE GROUP. 123 



OLEACEiB. 

 Fraxiuus eocenica, Lesqz. 



Plate XX, Figs. 1-3. 

 "U. 8. Geol. Rep.," vii, p. 229. 



This fine species has heen fully described, as quoted above. The 

 .specimens which represent it belong to the Princeton Museum. 



ARALLiCEiE. 



A r a 1 i a j) u ii g: c u .s , sp. nov. 



Plate XIX, FigB. 3,4. 



Leaves coriaceou.s, rigid, very large, palinately divided; segments deeply cut 

 into lanceolate sharply acuminate lobes — the lower opposite, the upper simple or lobate 

 on one side. 



The general outline of the leaves represented by the figured frag- 

 ments is very probably analogous to the one figured in pi. xxxv of this vol- 

 ume; for it is evident that we have here mere segments or fragments of 

 a compound leaf. These segments are subdivided into long lanceolate 

 sharply acuminate entire lobes, which, oblique at their base, are turned 

 up and erect at the apex. The nervation of the segments is pinnate; the 

 lower secondary veins are opposite, strong, passing up to the point of the 

 lobes, or curving up and following close to the borders like the lateral 

 veins of the lobes. 



This species is allied in its form to Avhat has been described in vol. 

 vii as M. Lcssigii, p. 13(3, but the nervation differs. In M. Lessigii, the 

 tertiary veins directed toward the sinuses divide under them into two 

 branches, passing along on both sides and following the borders of the 

 lobes, while in this leaf the tertiary veins do nol divide, but appear to 

 merely pass up on one side without forking. Though this difference may 

 be marked, it is scarcely possible to doubt that these fragments represent 

 the same group or the same genus of plants, and, as I have remarked it 

 in the description of M. Lessigii, Saporta and other authors refer planis of 

 this kind to the AraUaoece. 



The fossil leaves, published thus far, and more evidently related to 

 these fragments, are the species of S>/lphidium, Massalongo, on which 

 Schimper remarks that the three species described from fragments are 



