Gress : Fossil Plants of the Dakota. 287 



to a blunt apex, and downward to a long petiole, entire ; median nerve 

 strong; secondaries thin; slightly curved in passing toward the bor- 

 ders, camptodrome." Our specimen is about 7 cm. long and 3.5 cm. 

 wide near the middle of the blade. In shape and veining it resembles 

 very closely the Minn, specimen, PI. B, fig. 3, op. cit. Part of the 

 apex and part of the base are wanting. The veining and areolation 

 are very distinct. 



Occurrence: Ellsworth County, Kansas, Dakota Sandstone (Cre- 

 taceous). Baron de Bayet Collection, Accession No. 2348, Carnegie 

 Museum, Pittsburgh, Pa. (No. 30). Also north side of the Big Cot- 

 tonwood River, near New Ulm, Minn. 



4. Populus kansaseana Lesquereux. 



Populns kansaseana Lesquereux, The Flora of the Dakota Group, U. S. 

 Geological Survey, Monograph XVII, 1892, p. 42, PI. 17, figs. 1-7. 



Description: The petiole of our specimen is wanting. The leaf is 

 5.5 cm. in length and 2.4 cm. in width a little below the middle. It is 

 ovate lanceolate, acuminate, rounding to the petiole, entire. The 

 midrib is comparatively heavy below, but becomes very thin toward 

 the apex. The secondaries are not distinct toward the apex, but there 

 are about six pairs. The lowermost pair is opposite and suprabasilar, 

 with a thin, basilar nerville underneath, which fits exactly with Les- 

 quereux's description, op. cit. According to Lesquereux's figures, the 

 leaf must vary considerably. Our leaf, which shows both upper and 

 lower surfaces, varies a little from any figured by Lesquereux. Its 

 broadest part is a little below the center and it seems to taper more 

 gradually to the apex, which seems to be a little longer and more 

 pointed than those figured. I think, however, the evidence is suffi- 

 cient to refer the leaf to this species. 



Occurrence : Ellsworth County, Kansas, Dakota Sandstone (Cre- 

 taceous). Baron de Bayet Collection, Accession No. 2348, Carnegie 

 Museum, Pittsburgh, Pa. 



Nos. 40 and 40a are the upper and lower parts of the same nodule; 

 40c is a smaller leaf of the same collection. A fourth specimen (40b) 

 is from the U. S. National Museum (C. M., Accession No. 4799). 



