DESCRIPTION OF SPECIEB— RHAMNE/E. 270 



others dentate. These have the same character of ncrvalion as marked in 

 fig. lift, enlarged. 



Habitat. — Golden, Soutli Table Mountain, Colorado; one specimen only. 



K It a in n u s r c c t i n e r v i s , Heer. 



Plate LII, Figs. 1'2-15. 



Jihammis rectinwvis, Hear, FI. Tert. Helv., iii, p. 80, pi. cxxv, figs. 2,6. — Lesqs., Aumial Eeport, 1871, 

 pp. 295, 298 ; Supplomeut, p. 12; Annual Report, 1872, pp. 383, 397, 402 ; 1873, p. 405. 



Leaves snljcoriaceous, oblong, entire, dentate only toward the point; secondary nerves, eight to 

 twelve pairs on an acute angle of divergence, camptodrome. 



The specimens which I refer to this species are numerous in the Lower 

 Liguitic of Colorado and Wyoming. The leaves are rather large, indistinctly 

 dentate toward the point; the secondary nerves, more open in joining tlie 

 midrib, ascend straight to the borders under an angle of divergence of 30° 

 to 40°, sometimes inequidistant, and generally parallel. Comparing the frag- 

 ment of fig. 12 to fig. 6 of Heer {loc. cif.), the identity of the characters is 

 evident. Our fig. 13 is more obtuse, the veins less distant, and at a more open 

 angle of divergence. It seems at first referable to another species; but it is 

 upon the same specimen as fig. 12, has the same facies, and, indeed, there 

 are other fragments which indicate intermediate characters; none, however, 

 with the point preserved but this one. Fig. 15 is more doubtfully referable 

 to this species on account of the very close nervilles. 



Habitat. — Black Buttes, Wyoming, and Golden, Colorado, mostly. The 

 specimen represented in fig. 15 is from the Canon Coal-Measures, by D?: A. 

 C. Peak. Found also at Evanston, Wyoming; six miles above Spring Caiion, 

 Montana; and the Raton Mountains, New Mexico, by Dr. F. V. Haydeii, mostly 

 in fragmentary specimens. 



R li a in n 11 s i n se q u a 1 i s , Lesqx. 

 Plate LII, Fig. 16. 

 Rhamnus inaqualis, Lesqx., Annaul Report, 1873, p. 405. 



Leaf small, snbcoriaceous, very entire, inequilateral ; secondary nerves alternate, on an acute 

 angle of divergence, straight to the borders, camptodrome. 



This fragment is rather of uncertain relation; the direction of the second- 

 ary nerves, the inequilateral shape, and the oblique, close nervilles referring 

 it to this genus by a distant likeness to R. CEningensis, Heer, of the 

 European Miocene; the branching of one of these nerves, however, is in 

 contradiction to the general character of nervation of species of Rhummis. 



