DESCEIPTION OF SPECIES— TlLIACEiE. 257 



GREWIOPSIS, Sap. 



Leaves of various forms, often large and diversely lobed, generally acutely dentietilate, more or less 

 cordate, snl>[)alniately nerved ; lateral primary nerves more prolonged than the secondary ones, hranch- 

 ing outside, with branches craspedodrouie, like the secondary nerves, which are often nneijnal in length, 

 and joined by intermediate veins in varions directions; tertiary nerves transverse, veinK:ts nnitcd by 

 nervilles in (juadraio or trapezilorm meshes. 



Ill th(! comparison of the following species to some of those which the 

 author has described as referable to it, it will be seen that the generic (diar- 

 acters are not yet definitely ti.ved. 



C» r e w i o |t s i s S a |> o r t a ii a . sp. nov. 

 Plato L, Figs. 10-12. 

 Jliuriks Rocenka, Lesqx., Annual Report, 1872, p. ;i'.)7. 



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

 niinntcly denticnlato; subpalmately nerved, all the divisions craspedodromo. 



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. 

 Tli(;ir 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. orhkulata, 

 Sap. (Sez. Foss. FL, p. 411, pi. xi, figs. 11, 12), to which this sj)ecies is inti- 

 niatel}' related. Indeed, in comparing both figs. 10 and 11 of our plate witli 

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

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

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

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

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

 has been established for the description of those of the Eccene 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 tliat of G. trcmuIafoUa 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 l)e the only ones to which the fossil remains figured here had some 

 a})})arcnt relation. There 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 com])ared the fossil leaves, and especially in 

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

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

 changed, of course, as inappropriate, as all the spt^cies of G/etviojJsis known 

 17 T V 



