DESCEIPTION OF SPECIES— TILIACE^. 257 



GREWIOPSIS, Sap. 



Leaves of various forms, ofteu large and diversely lobed, generally acutely denticulate, more or less 

 cordate, subpalmately nerved ; lateral primary nerves more prolonged than the secondary ones, branch- 

 ing outside, with branches craspedodrome, like the secondary nerves, which are often unequal in length, 

 and joined by intermediate veins iu various directions ; tertiary nerves transverse, veinlets united by 

 nervilles iu quadrate or trajjcziform meshes. 



In the comparison of the following species to some of those which the 

 autiior has described as referable to it, it will be seen that the generic char- 

 acters are not yet definitely fixed. 



Orcwiopsis Saportana, sp. nov. 

 Plate L, Figs. 10-12. 

 AleurUcs Eocenka, Lesqx., Annual Eeport, 1872, p. 397. 



Leaves membranaceous, somewhat thick, oval, obtusely pointed, cuneate to the petiole, distantly, 

 minutely denticulate; subpalmately nerved, all the divisions craspedodrome. 



The three specimens here represented of this species are all of the same 

 size, averaging eight centimeters long and four and a half centimeters broad. 

 Their form does not agree well with the characters indicated in the generic 

 diagnosis, the base being cuneiform or rapidly narrowed, but not cordate. 

 The same character is, however, exactly similar in the leaves of G. orhiculata, 

 Sap. (Sdz. Foss. Fl., p. 411, pi. xi, figs. 11, 12), to which this species is inti- 

 mately related. Indeed, in comparing both figs. 10 and 11 of our plate with 

 fig. 12 of the Sezanne Flora, the only difference worth remarking is in the 

 smaller size of the European leaves. The subpalmate division is somewhat 

 more indistinct in the American species, but fig. 13 of the Suzanne Flora shows 

 it quite as indistinctly as our fig. 11. I have therefore no doubt whatever about 

 the reference of the leaves of I31ack Buttes to the same genus as the one which 

 has been established for the description of those of the Eocene of Sezanne ; 

 even the petiole seems to have been long in the European leaves, as seen by the 

 fragment left of it (fig. 12, loc. cit.), and in that of G. trcmulafoUa of the same 

 flora. When I referred these leaves to Aleurites, the flora of Sezanne was not 

 published, and the leaves of some species of this genus inhabiting Cuba 

 seemed to be the only ones to which the fossil remains figured here had some 

 apparent relation. Tliere is, however, a marked difference in the tertiary and 

 the secondary nervation, the tertiary nerves curving nearer to the borders in 

 Aleurites triloba, Gray, to which I compared the fossil leaves, and especially in 

 the irregular direction of the nervilles, which are more distinctly marked, and 

 the border veinlets as strong as tertiary veins. The specific name had to be 

 changed, of course, as inappropriate, as all the species of Gretoiopsis known 

 17 T F 



