420 



ON SPECIES OF FOSSIL PLANTS 



The specimen copied, Fig. 7, was collected near La Grange, by Prof. B. Meigs, and com- 

 municated by Prof. James Safford, to whom I am indebted for all the specimens from 

 Tennessee. 



20. Sapindus undulatus, Al. Brawn. PI. xxii, Kg. 6. S. foliis mombranaceis, lanceolatis, subobtusis, basi 

 attenuatis, inaoquilatcralibus, subfaloatis, margine undulatis; ncrvo medio orasso, nervis seoundariis sub angulo 

 acuto egrcdientibus, vix curvatis. 



Red shale. 



Our leaf is shorter than the figure given of this species by Heer, Flor. Tcrt. Hclv., PL 

 exxi, Fig. 5, but there is no other difference. It is slightly obtuse, inequilateral, falcate ; 

 the nearly opposite secondary nearly straight nerves diverge in acute angles from the thick 

 primary one ; all characters found alike in both the European and the American leaves. 



21. Rhamnus marcunatus, Lesqx. PI. xxii, Figs. 8, 4, 5. Geol. Report of Arkansas, II, page 819, PI. vi, 

 Fig. 1. R. foliis subcoriaeeis, petiolatis, oblongis, ovalibus, aoutis vel subobtusis; margins (roflexo ?) intcgris, 

 ncrvo medio crasso, nervis seoundariis angulo acuto egrcdientibus, secundum margincm decurrentibus, valdc 

 curvatis ncrvulis parallclis. 



lied shale. 



This marked species is closely related to, if not identical with Rhamnus Cardinimus, 

 Walt. The leaves of the fossil plant are broader, more abruptly narrowed to the petiole, 

 and more obtuse at the point ; the medial nerve is slightly broader and the petiole is 

 longer. The secondary nerves curve along the borders, closely following them, thus ap- 

 pearing to form a margin all around the leaves. In specimens of R. Carolinianus, col- 

 lected in the mountains of Arkansas, and whose leaves are somewhat thick and shining, 

 the secondary nerves run to and along the reflcxcd margin in such a way that maceration 

 and compression would, I think, produce the same apparent border as is seen on the fossil 

 leaves. In large leaves also of the Arkansas variety, the medial nerve is as broad, and 

 the petioles are as long as in the fossil species. The best preserved specimens of the col- 

 lection are here represented. The leaves are very variable in si/e, and apparently more 

 or less pointed. This species is not intimately related to any fossil one of the tertiary of 

 Europe, where the genus is nevertheless abundantly represented. 



22. Jtjglans APPRESSA, Spec. nov. PI. xx, Fig. 6. J. foliis lineari lanceolatis, margine dentibus appressis 

 obscure serratis, nervo medio valido, nervis seoundariis ex angulo subrecto valde curvatis, camptodromis, cras- 

 sioribus. 



lied shale. 



The reticulation of this fragment of leaf shows it to belong to a Garya or a Juglans. 

 By comparison with leaves of Juglans rupestris, Engl., a species from California, the 



