ISO THE FLORA OF THE DAKOTA GROUP. 



Order TILIACE^. 

 Tribe APEIBE^E. 



Apeibopsis cyclophylla, sp. nov. 

 PL XXV, Fig. 6. 



Leaves membranous, entire, polished on the surface, nearly round, 

 abruptly, slightly declining downward in reaching the broken petiole ; 

 median nerve strong, ligid; secondaries also strong, five pairs, alternate, 

 efpiidistant, parallel, slightly curved in passing to the borders, simple, 

 camptodrome, the lower pair supra-basilar; angle of divergence 45°, nerv- 

 illes strong, at right angles, simple or sometimes curved and forking at the 

 middle; areolation very distinct, in small quadrate meshes. 



This leaf, which is 7*"" long and 6" broad, has the same form and 

 about the same size and character aS that of A. Thonisenimia Heer,^ and 

 would be referred to this species but for one pair of thinner, Ijasilar nerves 

 close to the lower secondaries, ascending in a broad cm-ve to the middle of 

 the leaf, which, although seen in the leaf from Greenland, is not present in 

 that of the Dakota Group. In Heer's leaf also the areolation, which in that 

 from Kansas is very distinct and quadrate, is not figured, or is, as he says, 

 effaced; and there is only a single leaf of this form k]iown from Greenland 

 and one from the Dakota Group. The points of comparison are insufficient. 

 No traces of the fruits of Apeibopsis, which have been abundantly found in 

 the Miocene flora of Europe, have been as yet observed in the Cretaceous. 

 The generic relation of the leaf is therefore not positively established. 



Habitat: Ten miles northeast of Delphos, Kansas. No. 4162 of the 

 collection of Mr. R. D. Lacoe. 



Tribe GRE^VIE.<e. 



Grewiopsis Haydenii Lesq. 



Cret. Fl., p. 97, PI. in, Figs. 2, 4 ; PI. xxiv. Fig. 3. 



Grewiopsis ^quidentata, sp. nov. 

 PL LVIII, Fig. 4. 



Leaf subcoriaceous, ovate, subtruncate or broadly cuneate at the 

 enlarged base, gradually narrowed or tapering upward, obtusely pointed, 

 borders distinctly, acutely, simply, rarely doubly dentate; midrib strong; 



' »Fr. Fobs. Arct.,vol. 6, Abth. 2, p. 95, PI, xxxvi, Fig. 5. 



