Gress: Fossil Plants of the Dakota. 317 



Description : The specimen is about 7 cm. long from the top of the 

 petiole to the apex of the middle lobe. It is probably from 8 to 10 

 cm. broad between the apices of the two upper lateral lobes (the one 

 is broken off). The lowermost lateral lobes are rather short-pointed 

 and recurved. It is palmately three-veined ; the two lateral veins 

 branch at a short distance from the petiole, each branch going to one 

 of the lowermost lateral lobes. The leaf looks almost exactly like 

 that represented in fig. 2, op. cit. 



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

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

 Museum, Pittsburgh, Pa. {No. 21). A second specimen {No. 21a) 

 is from Fort Marker, Kansas (C. M., Accession No. 4799). 



Genus Protophyllum. 



This genus was established by Lesquereux to include some leaves 

 which he had previously referred to Credncria or to Pfcrospermites. 

 There are five" specimens of these leaves in the collections studied: 

 Protophyllum Lccontcanum Lesquereux, Protophylliim rugosum Les- 

 quereux, Protophyllum Sternbergii Lesquereux, and two other speci- 

 mens which evidently belong to the genus Protophyllum, but which 

 differ from any described species, with which I have been able to 

 compare them. I. therefore, have given them the names Protophyllum 

 ovatum and Protopliyllum vihurnifolinm. 



47. Protophyllum ovatum Gress, sp. nov. (Plate XIV, figs, i and 2.) 



Description: The leaf is about 10 cm. long and 8 cm. wide a little 

 below the middle. It is ovate or elliptical in outline, rather abruptly 

 rounded to a truncate or somewhat heart-shaped l)ase, and to a 

 slightly acuminate apex. The margin is distinctly and coarsely 

 toothed. There are ten or eleven pairs of craspedodrome secondaries, 

 which spring from a midrib of medium thickness. The lowermost 

 three or four pairs are crowded together and comparatively slender, 

 branching from the midrib at a very large angle, nearly perpendicular. 

 The remaining upper pairs are stronger, farther apart, and branch 

 from the midrib at a more acute angle. The fourth and fifth pairs 

 from the base send off about three branches from the lower side ; 

 fewer branches emerge from the secondaries toward the apex. Ter- 



