Gress: Fossil Plants of the Dakota. 319 



49. Protophyllum Leconteanum (Lesquereux) Lesquereux. 



Credneria Leconteana Lesquereux, American Journal of Science and Arts 

 (series 2), XLVI, 1868, p. 98. 



Protophyllum Leconteanum Lesquereux, Cretaceous Flora, Report of the 

 U. S. Geological Survey of the Territories, VI, 1874, p. 103, PI. 17, fig. 4, 

 and PI. 26, fig. i ; The Cretaceous and Tertiary Floras, U. S. Geological 

 Survey of the Territories, VIH, 1883, p. 89. (Gives name and reference 

 only) ; The Flora of the Dakota Group. U. S. Geological Survey, Mono- 

 graph XVII, 1892, p. 187, PI. 40, fig. I. 



Description: The leaf is almost perfect, except at a fev^ places on 

 the margin, particularly near the apex. The venation is very dis- 

 tinct. This is the only specimen in the collection from the Dakota 

 Group in which we find portions of the leaf. About an inch of the 

 lower end of the midrib with some branches is still in position. No 

 attempt has been made as yet to study the cell structure of these 

 remains, but probably sufficient tissue is present that by careful work 

 something of the structure might be ascertained. 



The fossil bears a label showing that it is one of a collection made 

 by Chas. Sternberg and has been identified by Leo Lesquereux. 



The leaf is about 10 cm. long and 10 cm. wide and fits Lesquereux's 

 description and figures so well that it needs no description or dis- 

 cussion to refer it to Protophyllum Leconteaman Lesquereux. 



Occurrence : Fort Harker, Kansas. Dr. Leconte collected his 

 specimens about three miles northeast of Ft. Harker and near Brooks- 

 ville. Kansas. Credneria Leconteana is described from Nebraska in 

 American Journal of Science, /. c. 



50. Protophyllum Sternbergii (Lesquereux) Lesquereux. 



Pterospermites Sternbergii Lesquereux, U. S. Geological Survey of Mon- 

 tana, etc., by Hayden, 1872, p. 425. 



Protophyllum Sternbergii Lesquereux, Cretaceous Flora, Report of the U. S. 

 Geological Survey of the Territories, VI, 1874, p. loi, PL 16, fig. i, and 

 PI. 17, fig. 2; Cretaceous and Tertiary Floras, U. S. Geological Survey of 

 the Territories, VIII, 1883. p. 89. (Gives name and reference only) ; The 

 Flora of the Dakota Group, U. S. Geological Survey, Monograph XVII, 

 1892, p. 189, PI. 42, fig. I. 



Description: The leaf is about 10 cm. long by 9 cm. broad. The 

 venation is distinctly that of Protophyllum. The base is broken so 

 that the pelta, which Lesquereux says is the greatest distinguishing 

 feature between Sternbergii and Leconteanum, can not be observed. 



