DESCRIPTION OF SPECIES— ANACAHDIACE^. 293 



It li II N |»MO II <l o - Itl o i'i:i ill, sp. nov. 



Pliito LVIII, I'ig. 11. 



LtMvcM pimiiitely divided; leaflets oblong, gradually aud 8lij;btly enlarged from the narrowed 

 base to above tbe middle, dentate upward ; lateral nerves very obliqne, straight, subcamptodrome, con- 

 nected wilh the teeth by nervilles. 



By its sliape ;iii(l size, this leaflet is like those of R. Meriani, Ileer (Fl. 

 Tert. Ilelv., p. 82, pi. cxxvi, figs. 5-11). It is, however, dentate only near the 

 point, and the nervation is not truly craspedodronic, the lateral nerves curving 

 along tlie bonhirs being connected with the teeth by nervilles. In liie upper 

 ])art of some of the leaflets represented by Heer (figs. G and 8, loc. cit.), the 

 nervation seems of the same eharaeter, and in fig. t), whieh resendjles ours 

 more than any other, the lower lateral nerves are truly camptodrome in the 

 lower part, where the borders are entire, and in the upper part, at least on one 

 side of the leaflets, the arches are connected with the teeth by nervilles. As 

 I have for comparison the oidy specimen figured, it is not advisal)Ie to admit 

 specific identity from a casual affinity which looks like a diversion of the 

 general character. In this species, the secondary nerves, on an acute angle 

 of divergence of 20° to 25°, are more distant in the lower part of the leaflet, 

 very close toward or within the acumen. The substance is rather thick, 

 membianaeeous or subcoriaceous. 



Habitat. — Black Buttcs, Wyoming: above the main coal. 



IE li II s I'osa^rolia, Lesqz. 

 Plate XLII, Figs. 7-9. 

 Weinmannia rosa-foha, Lesqx., Annual Report, 1873, p. 41.5. 



Leaf compound, imparipiuuato, with three to four pairs of small, narrowly elliptical leaflets, 

 obtusely pointed, rounded in narrowing to the sessile base, obscurely serrate in tbe upper part or entire ; 

 medial nerves thick, half-round; lateral nerves aud areolation obsolete; racbis narrowly margined. 



The dentation of the leaflets is not very distinct; some detached ones, 

 apparently the lower, seen upon the same specimens, are smaller, and have 

 {\\v. borders very entire (figs. 8 and 9). I referred this leaf to Weininannia 

 on account of the likeness of these remains to living species of this genus 

 figured in Ett. Fl. v. Bil., i, pi. xxiii, figs. B, C. Count Saporta considers 

 it as prol)ably representing a species of Rhus, and I am the more disposed 

 to admit his opinion, because remains of R/ius abound in the Upptjr 

 Miocene flora of the Parks, where this plant has been found, while none 

 of the central and tropical vegetable types have been recognized there. 

 Indeed, the presence of species of Weimnantiia, a genus especially dis- 



